CN106654770A - Universal serial bus (USB) extension cord - Google Patents
Universal serial bus (USB) extension cord Download PDFInfo
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- CN106654770A CN106654770A CN201611263951.3A CN201611263951A CN106654770A CN 106654770 A CN106654770 A CN 106654770A CN 201611263951 A CN201611263951 A CN 201611263951A CN 106654770 A CN106654770 A CN 106654770A
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- usb
- signal
- class standard
- data
- interface chip
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R31/00—Coupling parts supported only by co-operation with counterpart
- H01R31/06—Intermediate parts for linking two coupling parts, e.g. adapter
- H01R31/065—Intermediate parts for linking two coupling parts, e.g. adapter with built-in electric apparatus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
- H01R13/6691—Structural association with built-in electrical component with built-in electronic circuit with built-in signalling means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2201/00—Connectors or connections adapted for particular applications
- H01R2201/06—Connectors or connections adapted for particular applications for computer periphery
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Information Transfer Systems (AREA)
Abstract
An embodiment of the invention provides a universal serial bus (USB) extension cord. According to the USB extension cord, in processes of transmitting a standard USB signal and a class standard USB signal, a second USB transmitting module and a second USB receiving module in each USB interface chip and a USB wire connected with two USB interface chips are multiplexed, so that hardware cost is lowered, and connecting lines of two USB interface chips are not required to be occupied independently; and in addition, the second USB transmitting module can convert a non-stand USB signal into the class standard USB signal, and the class standard USB signal can be transmitted through the USB wire. Each module in every USB interface chip in the USB extension cord is relatively high in performance, and the signal transmission rate is relatively high, so that the signal transmission distance and signal transmission rate of the USB extension cord are improved consequently.
Description
Technical field
The invention relates to universal serial bus technology field, is more particularly to general-purpose serial bus USB extended line.
Background technology
At present USB (Universal Serial Bus, USB) Host (main frame) and USB Device (set
It is standby) communication when need add USB extended lines.As shown in figure 1, passing through USB extended lines and USB for USB Host in prior art
The circuit diagram of Device connections.USB extended lines include chip 11 and chip 12, and chip 11 includes：First circuit 111 and
Two circuits 112, wherein the first circuit 111 includes：USB sending module (the USB of first USB receiver modules (USB RX) the 1, the
TX) the 1, the 2nd USB receiver modules (USB RX) 2 and the 2nd USB sending modules (USB TX) 2；Second circuit 112 includes：
SRAM1 (Static Random Access Memory, static RAM), TX (transmit, transmission) and RX
(receive is received)；Chip 12 includes：The circuit 122 of tertiary circuit 121 and the 4th, wherein, tertiary circuit 121 includes：The
The USB receiver modules (USB RX) 2 of one USB receiver modules (USB RX) the 1, the first USB sending modules (USB TX) the 1, the 2nd and
2nd USB sending modules (USB TX) 2；4th circuit 122 includes：SRAM2, TX and RX；USB Host pass through USB wire
It is connected with chip 101, the first circuit 111 is connected by USB wire with tertiary circuit 121；Second circuit passes through wire and the 4th
Circuit is connected；Chip 102 is connected by USB wire with USB Device.Chip 101 and chip 102 include I2C buses；Can
With by I2C buses carry out read operation or write operation to the SRAM in respective chip.I2C buses include：SCL and SDA, wherein,
SCL is I2The clock cable of C buses；SDA is I2The data signal line of C buses.
The process that USB Host 10 and USB Device 13 carry out standard usb signal transmission is as follows：USB Host pass through
The 2nd USB in the 2nd USB sending modules 2, chip 12 in a USB receiver modules 1, chip 11 in chip 101 is received
A USB sending modules 1 in module 2, chip 12, send to USB Device；USB Device are by chip 12 first
In the 2nd USB receiver modules 2, chip 11 in USB receiver modules 1, chip 12 in the 2nd USB sending modules 2, chip 11
One USB sending modules 1, send to USB Host.
If desired non-standard usb signal is transmitted, then needs the I of chip 112C buses will need data Cun Chudao for sending
In SRAM1；TX in chip 11 can obtain the data, and the RX sent into chip 12 from SRAM1；RX in chip 12
By in the data storage for receiving to SRAM2；In the same manner, the I in chip 122C buses can will need data Cun Chudao for sending
In SRAM2；TX in chip 12 can obtain the data, and the RX sent into chip 11 from SRAM2；RX in chip 11
By in the data storage for receiving to SRAM1.
USB RX, USB TX, USB wire are that signal transmission distance is longer (can be grown for the transmission of standard usb signal
Up to more than 50m), and signaling rate is very fast, but TX, RX, wire are its transmission for the transmission of non-standard usb signal
Distance is shorter, and transmission speed is slower, can thus limit the overall signal transmission distance of USB extended lines and signal transmission speed
Degree so that the signal transmission distance of USB extended lines is shorter relatively low with signaling rate.
The content of the invention
In view of this, the invention provides a kind of general-purpose serial bus USB extended line, to overcome prior art in USB prolong
The signal transmission distance of long line is shorter and the relatively low problem of signaling rate.
For achieving the above object, the present invention provides following technical scheme：
A kind of general-purpose serial bus USB extended line, including：Two USB interface chips being connected by USB wire；Its
In, each USB interface chip includes：
Memory, for data storage；
First USB receiver modules；
First USB sending modules；
The 2nd USB sending modules being connected with a USB receiver modules and the memory respectively, for from institute
State and the first data to be sent are obtained in memory, according to the first data genaration class standard usb signal；And by class standard
Usb signal is sent to another USB interface chip；
The 2nd USB receiver modules being connected with a USB sending modules and the memory respectively, for from another
The second data are obtained in the class standard usb signal that one USB interface chip sends, and is stored into the memory.
Wherein, the 2nd USB sending modules are obtaining the first data to be sent from the memory, according to described
During the first data genaration class standard usb signal, specifically for：
Determine command type, the command type is used to indicate the type of corresponding class standard usb signal to confirm character type
Type or non-acknowledgement character types；
Determine the bit number that first data take up room；
Obtain the initial address in first data storage to another USB interface chip, and with the bit number phase
The side-play amount answered；
According to the command type, the initial address, the side-play amount, first data and pre-set it is same
Step sequence, the signal ended for pre-setting mark generate the corresponding class standard usb signal of first data.
Wherein, the 2nd USB sending modules are obtaining the first data to be sent from the memory, according to described
During the first data genaration class standard usb signal, it is additionally operable to：
Calculate the command type, the initial address, the side-play amount, the check code of first data；
It is described according to the command type, the initial address, the side-play amount, first data and to pre-set
Synchronizing sequence, the signal ended mark that pre-sets generates the corresponding class standard usb signal of first data and is specially：
According to the command type, the initial address, the side-play amount, first data, the check code and
The synchronizing sequence for pre-setting, the signal ended mark for pre-setting generate the corresponding class standard usb signal of first data.
Wherein, the class standard usb signal that another USB interface chip sends carries command type, initial address, side-play amount
And second data, the 2nd USB receiver modules obtain in the class standard usb signal sent from another USB interface chip
During the second data, specifically for：
Command type is obtained in the class standard usb signal sent from another USB interface chip；
When it is determined that the class standard usb signal that another USB interface chip sends is non-acknowledgement character types, from another USB
Second data, and the corresponding starting point of second data are extracted in the class standard usb signal that interface chip sends
Location and side-play amount.
Wherein, the 2nd USB receiver modules are when by second data storage to the memory, specifically for：
According to the corresponding initial address of second data and side-play amount, by second data storage to the memory
In.
Wherein, the class standard usb signal that another USB interface chip sends is carried for corresponding command type, accordingly
Initial address, corresponding side-play amount and second data check code, the 2nd USB receiver modules are additionally operable to：
Check code is obtained in the class standard usb signal sent from another USB interface chip；
When it is determined that the corresponding check code of class standard usb signal that sends of another USB interface chip is correct, perform from another
The step of the second data being obtained in the class standard usb signal that USB interface chip sends.
Wherein, each USB interface chip also includes：
Timer, for when the 2nd USB sending modules send class standard usb signal, starting timing；
The 2nd USB receiver modules, are additionally operable to：When the time of the timer record predetermined threshold value is more than or equal to,
Not receiving another the corresponding with the class standard usb signal that the 2nd USB sending modules send of USB interface chip transmission should
Signal is answered, then sends corresponding class standard usb signal to another USB interface chip again by the 2nd USB sending modules,
The answer signal is class standard usb signal.
Wherein, the answer signal carry command type and with corresponding check code, the 2nd USB receives mould
Block, is additionally operable to：
Receive the answer signal；
When the command type of the answer signal is to confirm character types, corresponding verification is extracted from the answer signal
Code；
When the check code mistake of the answer signal, again by the 2nd USB sending modules to another USB interface
Chip sends corresponding class standard usb signal；
When the check code of the answer signal is correct, determine that the 2nd USB sending modules successfully connect to another USB
Mouth chip sends corresponding class standard usb signal.
Wherein, usb signal includes class standard usb signal and standard usb signal；Usb signal carries pre-set same
Step sequence, synchronizing sequence is used to indicate that the 2nd USB receiver modules are also from as standard usb signal or class standard usb signal
For：
Receive the usb signal that another USB interface chip sends；
When it is class standard usb signal that synchronizing sequence determines the usb signal according to the usb signal, perform from another
The step for the second data being obtained in the class standard usb signal that one USB interface chip sends, and are stored into the memory；
When it is standard usb signal that synchronizing sequence determines the usb signal according to the usb signal, by USB letters
Number sent to usb host or USB device by a USB sending modules.
Wherein, each USB interface chip includes I2C buses；
I2C buses, for detecting currently whether need to transmit class standard usb signal；Need to transmit class standard when detecting
During usb signal, the connection of corresponding USB interface chip and usb host or USB device is disconnected；And mark when needs transmission is detected
During quasi- usb signal, the connection of corresponding USB interface chip and usb host or USB device is set up.
Wherein, the 2nd USB sending modules are when class standard usb signal is sent to another USB interface chip, specifically
For：
After to entering line position filling in class standard usb signal, non-return-to-zero reversal phase coding is carried out, the class standard after being encoded
Usb signal；
Class standard usb signal after coding is sent to another USB interface chip.
Understand via above-mentioned technical scheme, compared with prior art, embodiments provide a kind of general serial
Bus USB extended line, in the USB extended lines during transmission standard usb signal and class standard usb signal, is multiplexed each USB
The USB wire of the 2nd USB sending modules, the 2nd USB receiver modules and two USB interface chips of connection in interface chip；
The cost of hardware is reduced compared with prior art, and without the need for the independent connecting line for taking two USB interface chips, such as existing skill
Non-standard usb signal needs independent occupancy wire lines in art.And the 2nd USB sending modules non-standard usb signal can be changed
Into class standard usb signal, class standard usb signal can be transmitted by USB wire.Due to each USB interface in USB extended lines
A USB receiver modules, a USB sending modules, the 2nd USB sending modules and the 2nd USB receiver modules in chip
Performance is all higher, and signal transmission rate is very fast, therefore the signal transmission distance and signal transmission rate of USB extended lines can be with
It is identical with the signal transmission distance and signal transmission rate of the USB extended lines of only transmission standard usb signal.So as to improve USB
The signal transmission distance and signal transmission rate of extended line.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can be with basis
The accompanying drawing of offer obtains other accompanying drawings.
The circuit diagram that USB Host are connected by USB extended lines with USB Device in Fig. 1 prior arts；
A kind of circuit diagram of general-purpose serial bus USB extended line that Fig. 2 is provided for the embodiment of the present application；
Fig. 3 is obtaining to be sent for the 2nd USB sending modules that the embodiment of the present application is provided from respective memory
One data, according to the schematic flow sheet of the concrete methods of realizing of the first data genaration class standard usb signal；
A kind of data structure schematic diagram of class standard usb signal that Fig. 4 is provided for the embodiment of the present application；
The data interaction signaling diagram of two USB interface chips in the USB extended lines that Fig. 5 is provided for the embodiment of the present application；
A kind of data structure schematic diagram of answer signal that Fig. 6 is provided for the embodiment of the present application；
The signaling diagram of data interaction between two USB interface chips that Fig. 7 is provided for the embodiment of the present application.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in Fig. 2 a kind of circuit diagram of the general-purpose serial bus USB extended line provided for the embodiment of the present application.
The USB interface chip 201 and USB interface chip 202 being connected by USB wire is shown in Fig. 2.
Optional USB interface chip can be usb hub or USB repeaters.
USB interface chip 201 includes：Memory 2011, a USB receiver modules 2012, a USB sending modules
2013rd, the 2nd USB sending modules 2014 and the 2nd USB receiver modules 2015.
USB interface chip 202 includes：Memory 2021, a USB receiver modules 2022, a USB sending modules
2023rd, the 2nd USB sending modules 2024 and the 2nd USB receiver modules 2025.
First USB receiver modules 2012, the 2nd USB receiver modules 2015, a USB receiver modules 2022, the 2nd USB connect
It can be USB RX to receive module 2025；First USB sending modules 2013, the 2nd USB sending modules 2014, a USB send mould
Block 2023, the 2nd USB sending modules 2024 can be USB TX.
An above-mentioned USB sending modules 2013, the 2nd USB sending modules 2014, a USB sending modules 2023, second
USB sending modules 2024 can be USB TX；USB TX refer to standard USB TX, including low speed TX, full speed
TX and high speed TX；An above-mentioned USB receiver modules 2012, the 2nd USB receiver modules 2015, a USB receiver modules
2022nd, the 2nd USB receiver modules 2025 can be USB RX；USB RX refer to standard USB RX, including low speed RX,
Full speed RX and high speed RX.
Memory 2011 can be SRAM.
The annexation of each module is as shown in Fig. 2 no longer go to live in the household of one's in-laws on getting married here in USB interface chip 201 and USB interface chip 202
State.
Memory in each USB interface chip is used for data storage.
The 2nd USB sending modules in each USB interface chip, for the storage from affiliated same USB interface chip
The first data to be sent are obtained in device, according to the first data genaration class standard usb signal；And send out class standard usb signal
Deliver to another USB interface chip.
The 2nd USB receiver modules in each USB interface chip, for the class standard sent from another USB interface chip
During the second data, and the memory stored into affiliated same USB interface chip are obtained in usb signal.
In a kind of general-purpose serial bus USB extended line provided in an embodiment of the present invention, in transmission standard in the USB extended lines
During usb signal and class standard usb signal, the 2nd USB sending modules and second being multiplexed in each USB interface chip
USB receiver modules；The cost of hardware is reduced compared with prior art.And the 2nd USB sending modules non-standard USB can be believed
Number class standard usb signal is converted into, class standard usb signal can be transmitted by USB wire.Due to each in USB extended lines
A USB receiver modules, a USB sending modules, the 2nd USB sending modules and the 2nd USB in USB interface chip is received
The performance of module is all higher, and signal transmission rate is very fast, therefore the signal transmission distance and signal transmission speed of USB extended lines
Rate can be identical with the signal transmission distance of the USB extended lines of only transmission standard usb signal and signal transmission rate.So as to improve
The signal transmission distance and signal transmission rate of USB extended lines.
The generating process of class standard usb signal is described in detail below.As shown in figure 3, carrying for the embodiment of the present application
For the 2nd USB sending modules obtaining the first data to be sent from respective memory, according to the first data genaration category
The schematic flow sheet of the concrete methods of realizing of quasi- usb signal, the method includes：
Step S301：Determine command type, the type that the command type is used to indicate corresponding class standard usb signal is true
Recognize character types or non-acknowledgement character types.
Confirm that character types can include：ACK (Acknowledgement) type, in data communication, receiving terminal is issued
A kind of transmission class control character of transmitting terminal.The data that expression is sent have confirmed that acceptance is errorless.
The number for needing to store into respective memory is not carried in the class standard usb signal of ordinary circumstance confirmation character types
According to, and non-acknowledgement character types refer to and the data stored into respective memory in need are carried in class standard usb signal.
Step S302：Determine the bit number that first data take up room.
Step S303：Obtain the initial address in first data storage to another USB interface chip, and with it is described
The corresponding side-play amount of bit number.
Step S304：According to the command type, the initial address, the side-play amount, first data and pre-
The synchronizing sequence for first arranging, the signal ended mark for pre-setting generate the corresponding class standard usb signal of first data.
It is understood that can also calculate the command type, the initial address, the side-play amount, described first
The check code of data.Corresponding step S304 specifically for：According to the command type, the initial address, the side-play amount,
First data, the check code and the synchronizing sequence for pre-setting, the signal ended for pre-setting mark generate described
The corresponding class standard usb signal of first data.
Optionally, check code can be CRC (Cyclic Redundancy Check, CRC) check code.
As shown in figure 4, a kind of data structure schematic diagram of the class standard usb signal provided for the embodiment of the present application.
Wherein, SYNC (synchronization) is the synchronizing sequence for pre-setting.Command Type are order class
Type；ADDR is initial address；Offset is side-play amount, i.e., start to offset how many address bits from initial address；Byte0 is extremely
Byten is the data to be sent obtained from memory；EOP is the end of identification of class standard usb signal.Class standard USB believes
Number EOP can be identical with the EOP in standard usb signal.N is the positive integer more than or equal to 1.
Optionally, the SYNC in class standard usb signal can be 64bit, wherein there is 31 pairs of 01 sequences, last 2bit is
00.And the SYNC of standard usb signal is 32bit, wherein there is 15 pairs of 01 sequences, last 2bit is 00.
The Command Type bit wides illustrated in Fig. 4 are 4bit, can also be other bit wides in actual applications, can be with
The bit wide of Command Type is extended according to demand.
The bit wide of the ADDR illustrated in Fig. 4 is 8bit for the bit wide of 8bit, Offset, in actual applications, can basis
Demand extends its bit wide.
ADDR and Offset jointly defines the shared bit number of data to be transmitted, the bit shared by different pieces of information
Number is different, therefore, it can extend the bit wide of Offset according to practical application.
2nd USB sending modules obtain data to be sent in the memory from affiliated same USB interface chip, and will
Data are filled in Byte0 to Byten.
Calculate Command Type, ADDR, Offset, the check code of Byte0 to Byten, the CRC check of such as 16bit
Code.CRC16 is calculated in the calculating of CRC and standard usb signal in class standard usb signal, formula is as follows：G (X)=X16+X15
+X2+1。
EOP in class standard usb signal can be identical with the EOP in standard usb signal, and for example, 01111111.In Fig. 4
The bit wide of the EOP for illustrating is 8bit, in actual applications, or other bit wides.
The embodiment of the present application provides the bit wide of each several part shown in Fig. 4, but is not limited to this.
Fig. 5 is referred to, the data interaction letter of two USB interface chips in the USB extended lines provided for the embodiment of the present application
Order figure.Send data instance to USB interface chip 202 with USB interface chip 201 below to illustrate.USB interface chip 202
The process of data is sent to USB interface chip 201 and USB interface chip 201 sends the process of data to USB interface chip 202
It is identical.
Step S501：The 2nd USB sending modules 2014 in USB interface chip 201 obtain pending from memory 2011
The first data sent, and according to the first data genaration class standard usb signal, send to USB interface chip 202.
The data stored in memory 2011 include the first data to be sent, and the data can be memory 2011
I2C buses are by the first data storage to the memory 2011.
2nd USB sending modules 2014 can be refering to shown in Fig. 3 according to the process of the first data genaration class standard usb signal
Method, will not be described here.
Step S502：When the 2nd USB sending modules 2014 send class standard usb signal, in USB interface chip 201
Timer 2 016 starts timing.
Step S502 is optional step, therefore is outlined with dotted line frame in Figure 5.Optionally, each USB interface chip includes
Timer.
It is understood that USB interface chip 202 receives the class standard USB letters of the transmission of the 2nd USB sending modules 2014
After number, can represent and oneself received the class standard usb signal to feed back answer signal to USB interface chip 201.USB connects
If mouthful chip 201 does not receive corresponding answer signal within some time, then illustrate that class standard usb signal sends failure.
Step S503：The 2nd USB receiver modules 2025 of USB interface chip 202 receive class standard usb signal, from category
Command type, initial address, side-play amount, the first data and check code are extracted in quasi- usb signal.
Specifically, the 2nd USB receiver modules 2025 can determine category according to the command type in class standard usb signal
The type of quasi- usb signal；When class standard usb signal is non-acknowledgement character types, execution step is carried from class standard usb signal
Take out command type, initial address, side-play amount, the first data and check code.
Step S504：Check code is calculated according to command type, initial address, side-play amount, the first data；When the school for calculating
Test code with class standard usb signal carry check code it is identical when, determine that class standard usb signal is correct.
Preferably, class standard usb signal carries check code, now including step S504；When class standard usb signal is not carried
During check code, not including step S504.Therefore it is indicated by the dashed box in Figure 5.
Step S505：2nd USB receiver modules 2025 are according to initial address and side-play amount by the first data storage to storage
In device 2021, and answer signal is fed back to USB interface chip 201 by the 2nd USB sending modules 2023.
As shown in fig. 6, a kind of data structure schematic diagram of the answer signal provided for the embodiment of the present application.
Answer signal is also a kind of class standard usb signal, does not simply carry the number of Byte0 to Byten as shown in Figure 4
According to.The bit wide of answer signal each several part is shown in Fig. 6, the embodiment of the present application is provided but not limited to this.For the solution of each several part
Releasing can refer to the explanation of appropriate section in Fig. 4, will not be described here.
Preferably, answer signal carries the check code for Command Type.Can not certainly carry.School herein
It can be CRC check code to test code.Calculating process is consistent with CRC check Calculative Process as shown in Figure 4.Here is no longer gone to live in the household of one's in-laws on getting married
State.
Step S506：The 2nd USB receiver modules 2015 of USB interface chip 201 receive answer signal；Extract answer signal
In command type；When answer signal is to confirm character types, corresponding class standard usb signal transmission flow terminates.
Preferably, answer signal carries check code, and now step S505 includes：
Step S5061：2nd USB receiver modules 2015 calculate check code according to the command type of answer signal；When
The check code that two USB receiver modules 2015 are calculated is identical with the check code carried in answer signal, it is determined that answer signal is just
Really, the class standard usb signal transmission flow terminates.
Step S5062：When the check code carried in the check code that the 2nd USB receiver modules 2015 are calculated with answer signal
Differ, or timer record time be more than or equal to predetermined threshold value when, the 2nd USB receiver modules 2015 do not receive yet USB
Interface chip 202 send corresponding class standard usb signal answer signal, then return to step S501 send class standard again
Usb signal.
Because step S5051 and step S5052 are optional step, therefore it is indicated by the dashed box in Figure 5.
Answer signal correctly illustrates successfully have sent accordingly to USB interface chip 202 for USB interface chip 201
Class standard usb signal, the class standard usb signal transmission process terminates.
The USB extended lines that the embodiment of the present application is provided both can be with transmission standard usb signal, it is also possible to transmit class standard USB
Signal, by standard usb signal and class standard usb signal usb signal is referred to as, as shown in fig. 7, provide for the embodiment of the present application
The signaling diagram of data interaction between two USB interface chips.Sent to USB interface chip 202 with USB interface chip 201 below
Data instance illustrate.The process of the data that USB interface chip 202 sends to USB interface chip 201 and USB interface core
The process of the data that piece 201 sends to USB interface chip 202 is identical.
Step S701：The 2nd USB receiver modules 2025 in USB interface chip 202 receive USB interface chip 201 and send
Usb signal, judge the type of usb signal according to the synchronizing sequence of usb signal；When usb signal is class USB standard signal,
Execution step S503；When usb signal is standard usb signal, execution step S702.
Optionally, above-mentioned " judging the type of usb signal according to the synchronizing sequence of usb signal " is specifically, according to usb signal
The bit wide of middle synchronizing sequence judges the type of usb signal.As shown in figure 4, the bit wide of the synchronizing sequence of class standard usb signal is
64bit, and the bit wide of the synchronizing sequence of standard usb signal is 32bit.
Step S702：2nd USB receiver modules 2025 send standard usb signal to a USB sending modules 2023；The
One USB sending modules 2023 send standard usb signal to USB Device.
USB interface chip 202 is connected with USB Device in Fig. 2, therefore a USB sending modules 2023 are by standard USB
Signal is sent to USB Device；If USB interface chip 202 is connected with USB Host, a USB sending modules 2023 will mark
Quasi- usb signal is sent to USB Host.
The USB extended lines that the embodiment of the present application is provided both can transmit class standard USB again with transmission standard usb signal
Signal, in order to not affect the transmission of this two classes signal, optionally, each USB interface chip includes I2C buses；I2C buses, are used for
Whether detection currently needs to transmit class standard usb signal；When detect need to transmit class standard usb signal when, disconnect corresponding USB
The connection of interface chip and usb host or USB device；And when detect need transmission standard usb signal when, set up corresponding
The connection of USB interface chip and usb host or USB device.
To sum up, when class standard usb signal is transmitted using USB extended lines, USB Host can not communicate with USB Device.
I2C buses disconnect the connection of corresponding USB interface chip and usb host or USB device, refer to I2C buses do not drive corresponding USB to connect
Mouth chip and the USB wire between usb host or USB device；Now, usb host or USB device are just given tacit consent to oneself and are not connected with
USB interface chip, now usb host or USB device would not be communicated with USB interface chip, so usb host or USB
Communication between equipment and USB interface chip is just separated.As shown in Fig. 2 the I of USB interface chip 2012C buses disconnect USB
The connection of interface chip 201 and USB Host；The I of USB interface chip 2022C buses disconnect USB interface chip 202 and USB
The connection of Device.Now, the USB wire between USB interface chip 201 and USB interface chip 202 are in idle condition, can
To transmit class USB standard signal.
I2C buses set up the connection of corresponding USB interface chip and usb host or USB device, refer to I2C bus drivers are corresponding
USB wire between USB interface chip and usb host or USB device.
In the embodiment of the present application, in USB Host and USB Device proper communications, when having other request signals of forwarding,
Need for other signals to change into class standard usb signal, when USB extended lines are idle, multiplexing USB signalling channel (i.e. the 2nd USB
Sending module 2014, the 2nd USB receiver modules 2015, the 2nd USB receiver modules 2025, the 2nd USB sending modules 2024 and
USB wire between connection USB interface chip 201 and USB interface chip 202), interruption U SB Host and USB Device lead to
Letter, preferential forwarding class standard usb signal, now needs the standard usb signal that USB Host or USB Device sends to lose
Lose.After terminating Deng the transmission of class standard usb signal, release usb signal passage communicates to USB Host with USB Device, now
When standard usb signal that USB Host and USB Device lose is less, can also recover USB Host and USB Device it
Between communication, if lose standard usb signal it is more, need to re-establish the USB between USB Host and USB Device
Signalling channel.
For security of the class standard usb signal in transmitting procedure, class standard usb signal can also be encoded.
The 2nd USB sending modules in each USB interface chip have when class standard usb signal is sent to another USB interface chip
Body is used for：After to entering line position filling in class standard usb signal, non-return-to-zero reversal phase coding is carried out, the class standard USB after being encoded
Signal；Class standard usb signal after coding is sent to another USB interface chip.
Synchronizing sequence SYNC wherein in class standard usb signal is without the need for coding.Position filling (Bitstuff) refers to continuously
0 is inserted after 6bit 1, other holdings are constant.NRZI (non-return-to-zero reversal phase coding, No Return Zero-Inverse) is referred to
Source code is 0, level upset, and source code is 1, and level keeps constant.
Accordingly, the 2nd USB receiver modules in each USB interface chip are additionally operable to：Receive class standard usb signal
Afterwards, class standard usb signal is decoded.
First the data after the SYNC in class standard usb data are carried out into NRZI decodings, then removed the 0 of insertion.
The function phase of the module with same names is same in each USB interface chip in the embodiment of the present application；Such as USB interface
The function phase of the 2nd USB sending modules 2024 in the 2nd USB sending modules 2014 and USB interface chip 202 in chip 201
Together；The 2nd USB receiver modules 2015 and the 2nd USB receiver modules 2025 in USB interface chip 202 in USB interface chip 201
Function phase it is same；A USB sending modules 2013 in USB interface chip 201 send with a USB in USB interface chip 202
The function phase of module 2023 is same；The in USB receiver modules 2012 in USB interface chip 201 and USB interface chip 202
The function phase of one USB receiver modules 2022 is same.The data interaction between two USB interface chips is being enumerated in the embodiment of the present application
It is, using USB interface chip 201 as data sending terminal, to be as data receiver using USB interface chip 202 during embodiment
Example is illustrated, and when USB interface chip 202 is used as data sending terminal, USB interface chip 201 is used as during data receiver
Process is similar to, will, exchanged as corresponding module in the data exchange process of data receiver using USB interface chip 202.
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.And, term " including ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that a series of process, method, article or equipment including key elements not only includes that
A little key elements, but also including other key elements being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element for being limited by sentence "including a ...", does not arrange
Except also there is other identical element in including the process of the key element, method, article or equipment.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the application.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case of without departing from spirit herein or scope.Therefore, the application
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (11)
1. a kind of general-purpose serial bus USB extended line, it is characterised in that include：Two USB interfaces being connected by USB wire
Chip；Wherein, each USB interface chip includes：
Memory, for data storage；
First USB receiver modules；
First USB sending modules；
The 2nd USB sending modules being connected with a USB receiver modules and the memory respectively, for depositing from described
The first data to be sent are obtained in reservoir, according to the first data genaration class standard usb signal；And by class standard USB
Signal is sent to another USB interface chip；
The 2nd USB receiver modules being connected with a USB sending modules and the memory respectively, for from another
The second data are obtained in the class standard usb signal that USB interface chip sends, and is stored into the memory.
2. general-purpose serial bus USB extended line according to claim 1, it is characterised in that the 2nd USB sending modules exist
The first data to be sent are obtained from the memory, it is concrete to use during according to the first data genaration class standard usb signal
In：
Determine command type, the command type be used to indicating the type of corresponding class standard usb signal for confirm character types or
Non-acknowledgement character types；
Determine the bit number that first data take up room；
The initial address in first data storage to another USB interface chip is obtained, and it is corresponding with the bit number
Side-play amount；
According to the command type, the initial address, the side-play amount, first data and the synchronous sequence for pre-setting
Row, the signal ended for pre-setting mark generate the corresponding class standard usb signal of first data.
3. general-purpose serial bus USB extended line according to claim 2, it is characterised in that the 2nd USB sending modules exist
The first data to be sent are obtained from the memory, during according to the first data genaration class standard usb signal, is also used
In：
Calculate the command type, the initial address, the side-play amount, the check code of first data；
It is described according to the command type, the initial address, the side-play amount, first data and pre-set it is same
Step sequence, the signal ended for pre-setting mark generate the corresponding class standard usb signal of first data and are specially：
According to the command type, the initial address, the side-play amount, first data, the check code and in advance
The synchronizing sequence of setting, the signal ended for pre-setting mark generate the corresponding class standard usb signal of first data.
4. according to the arbitrary general-purpose serial bus USB extended line of claims 1 to 3, it is characterised in that another USB interface core
The class standard usb signal that piece sends carries command type, initial address, side-play amount and the second data, and the 2nd USB connects
When receipts module obtains the second data in the class standard usb signal sent from another USB interface chip, specifically for：
Command type is obtained in the class standard usb signal sent from another USB interface chip；
When it is determined that the class standard usb signal that another USB interface chip sends is non-acknowledgement character types, from another USB interface
Extract second data in the class standard usb signal that chip sends, and the corresponding initial address of second data and
Side-play amount.
5. general-purpose serial bus USB extended line according to claim 4, it is characterised in that the 2nd USB receiver modules exist
During by second data storage to the memory, specifically for：
According to the corresponding initial address of second data and side-play amount, by second data storage to the memory.
6. general-purpose serial bus USB extended line according to claim 5, it is characterised in that what another USB interface chip sent
Class standard usb signal is carried for corresponding command type, corresponding initial address, corresponding side-play amount and described second
The check code of data, the 2nd USB receiver modules, is additionally operable to：
Check code is obtained in the class standard usb signal sent from another USB interface chip；
When it is determined that the corresponding check code of class standard usb signal of another USB interface chip transmission is correct, perform from another USB
The step of the second data being obtained in the class standard usb signal that interface chip sends.
7. the general-purpose serial bus USB extended line according to claim 1 or 6, it is characterised in that each USB interface chip is also
Including：
Timer, for when the 2nd USB sending modules send class standard usb signal, starting timing；
The 2nd USB receiver modules, are additionally operable to：When the time of the timer record predetermined threshold value is more than or equal to, do not connect
Receive the response letter corresponding with the class standard usb signal that the 2nd USB sending modules send that another USB interface chip sends
Number, then corresponding class standard usb signal is sent to another USB interface chip again by the 2nd USB sending modules, it is described
Answer signal is class standard usb signal.
8. general-purpose serial bus USB extended line according to claim 7, it is characterised in that the answer signal carries life
Make type and with corresponding check code, the 2nd USB receiver modules, be additionally operable to：
Receive the answer signal；
When the command type of the answer signal is to confirm character types, corresponding check code is extracted from the answer signal；
When the check code mistake of the answer signal, again by the 2nd USB sending modules to another USB interface chip
Send corresponding class standard usb signal；
When the check code of the answer signal is correct, determine the 2nd USB sending modules success to another USB interface core
Piece sends corresponding class standard usb signal.
9. general-purpose serial bus USB extended line according to claim 1, it is characterised in that usb signal includes class standard USB
Signal and standard usb signal；Usb signal carries the synchronizing sequence for pre-setting, and synchronizing sequence is used to indicate from as standard
Usb signal or class standard usb signal, the 2nd USB receiver modules are additionally operable to：
Receive the usb signal that another USB interface chip sends；
When it is class standard usb signal that synchronizing sequence determines the usb signal according to the usb signal, perform from another USB
The step for the second data being obtained in the class standard usb signal that interface chip sends, and are stored into the memory；
When it is standard usb signal that synchronizing sequence determines the usb signal according to the usb signal, the usb signal is led to
Cross a USB sending modules to send to usb host or USB device.
10. general-purpose serial bus USB extended line according to claim 1, it is characterised in that each USB interface chip includes
I2C buses；
I2C buses, for detecting currently whether need to transmit class standard usb signal；Need to transmit class standard USB letters when detecting
Number when, disconnect the connection of corresponding USB interface chip and usb host or USB device；And need transmission standard USB when detecting
During signal, the connection of corresponding USB interface chip and usb host or USB device is set up.
11. general-purpose serial bus USB extended lines according to claim 1, it is characterised in that the 2nd USB sending modules
When class standard usb signal is sent to another USB interface chip, specifically for：
After to entering line position filling in class standard usb signal, non-return-to-zero reversal phase coding is carried out, the class standard USB letters after being encoded
Number；
Class standard usb signal after coding is sent to another USB interface chip.
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| CN106654770B (en) | 2018-11-20 |
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