CN202472500U - Embedded computer main board - Google Patents
Embedded computer main board Download PDFInfo
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- CN202472500U CN202472500U CN2012200416598U CN201220041659U CN202472500U CN 202472500 U CN202472500 U CN 202472500U CN 2012200416598 U CN2012200416598 U CN 2012200416598U CN 201220041659 U CN201220041659 U CN 201220041659U CN 202472500 U CN202472500 U CN 202472500U
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- embedded computer
- pin
- cpld
- main board
- computer main
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Abstract
The utility model discloses an embedded computer main board. The embedded computer main board comprises an ARM processor and a peripheral circuit, and further comprises a level driving module and a CPLD (Complex Programable Logic Device). A logic control signal end of the ARM processor is connected with a pin of the CPLD after passing through a level conversion circuit, and a control output signal of the CPLD is connected with an input/output buffer of the main board and a main board pin. According to the embedded computer main board, the i.MX257 is taken as the core, and a DDR2 (Double Data Rate 2), an NANDFLASH, a PHY (Physical Layer), an SD (Secure Digital Memory Card) base and an LCD (Liquid Crystal Display) interface are connected by inherent data bus interfaces. Simultaneously, in consideration of using more inherent excellent system resources, the 1.8V pin of the ARM and a level driver are used, and then, the CPLD is also introduced in the embedded computer main board, and data are output to the pin for external design, so that the embedded computer main body is simple in structure and high in utilization rate of inherent resources of the system.
Description
Technical field
The utility model relates to a kind of EM9170 industrial control mainboard, especially adopts the mainboard of programmable logic device (CPLD) control pin function.
Background technology
At present, the i.MX257 that Freescale company releases is a flush bonding processor that adopts the ARM926 kernel, and this chip has numerous application functions; But it only has 400 pins; And have 2nd/5th, power supply so the multiplexing functions degree on its pin is higher relatively, thereby causes in use these resources being installed reasonably; And a part of pin resource is very limited; And its output high level is merely 1.8V, and is incompatible with 3.3V, 5.0V level commonly used, thereby aggravated the difficulty of using.B1, B2 pin like i.MX257; It is the two-way input and output pin of output high level 1.8V; And multiplexing serial ports, input, output, SPI control signal, so this pin resource is of great rarity, and very inconvenient when using this pin; Promptly to consider its input, output character, guarantee it and 3.3V, 5.0V level compatibility again.In the pin resource of i.MX257, exist such situation quite a lot of.
The utility model content
The purpose of the utility model is to the problems referred to above, proposes a kind of embedded computer board, and the utility model passes through reasonably organization system structure, and available resources are utilized efficiently.
The technical scheme of the utility model is:
A kind of embedded computer board; It comprises arm processor and peripheral circuit; It also comprises level driver module and programmable logic device (CPLD); The logic control signal end of described arm processor links to each other with the programmable logic device (CPLD) pin through behind the level shifting circuit, and the control output signal of programmable logic device (CPLD) links to each other with the inputoutput buffer and the mainboard pin of mainboard.
The peripheral circuit of the utility model comprises the DDR2 storer, the NandFlash storer, and Ethernet PHY chip, SD deck, clock module and LCD interface, each module of described peripheral circuit links to each other with the corresponding interface of arm processor.
The DDR2 storer of the utility model is the 64MbDDR2 storer, and the NandFlash storer is a 128Mb NandFlash storer, and Ethernet PHY chip is a 10M/100M Ethernet PHY chip.
The embedded computer board of the utility model also comprises power supply and power sense circuit, and described power supply is each module for power supply of embedded computer board, and power sense circuit is connected with processor is two-way.
The arm processor of the utility model is i.MX257.
The beneficial effect of the utility model:
The utility model is a core with i.MX257, utilizes intrinsic data bus interface to connect DDR2, NANDFLASH, PHY, SD deck and LCD interface.Consider the outstanding resource of utilizing system intrinsic more simultaneously, utilize the 1.8V pin of ARM, add level driver after, introduce programmable logic device (CPLD), output to again and supply peripheral hardware to use on the pin, simple in structure, the utilization factor of the intrinsic resource of system is high.The power supply of system has three the tunnel, 1.45V, and 1.5V, 3.3V considers power problems in design, selected for use conversion efficiency at 95% DC-DC device.
Description of drawings
Fig. 1 is the theory diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described.
As shown in Figure 1; A kind of embedded computer board; It comprises arm processor and peripheral circuit; It is characterized in that it also comprises level driver module and programmable logic device (CPLD), the logic control signal end of described arm processor links to each other with the programmable logic device (CPLD) pin through behind the level shifting circuit, and the control output signal of programmable logic device (CPLD) links to each other with the inputoutput buffer and the mainboard pin of mainboard.
The utility model embedded computer board adopts the compact mode, and overall dimensions are: 74*53 (mm)
Signal pins:
Embedded computer board mainly provides communication through 3 signal output interfaces outside system: two groups of double pins (2.54mm spacing, every group 38 core) and ZIF40 (0.5mm spacing, 40 cores) displays (TFT LCD) interface are respectively CN1, CN2, CN3.CN1 is on the computer motherboard left side, and CN2 is the contact pin of double straight cutting on computer motherboard the right, and CN3 is 40 core flat wire seats in the lower left corner.
The signal definition of each pin of EM9170_CN1 such as following table:
During each pin of EM9170_CN2 DIO is operated, each signal definition such as following table:
Each pin of EM9170_CN2 to simplifying ISA expansion bus when operation, the definition of each pin is following:
The explanation of CN3:LCD shows signal pin:
The utility model does not relate to all identical with the prior art prior art that maybe can adopt of part to be realized.
Claims (5)
1. embedded computer board; It comprises arm processor and peripheral circuit; It is characterized in that it also comprises level driver module and programmable logic device (CPLD); The logic control signal end of described arm processor links to each other with the programmable logic device (CPLD) pin through behind the level shifting circuit, and the control output signal of programmable logic device (CPLD) links to each other with the inputoutput buffer and the mainboard pin of mainboard.
2. embedded computer board according to claim 1; It is characterized in that described peripheral circuit comprises the DDR2 storer; The NandFlash storer; Ethernet PHY chip, SD deck, clock module and LCD interface, each module of described peripheral circuit links to each other with the corresponding interface of arm processor.
3. embedded computer board according to claim 2 is characterized in that described DDR2 storer is the 64MbDDR2 storer, and the NandFlash storer is a 128Mb NandFlash storer, and Ethernet PHY chip is a 10M/100M Ethernet PHY chip.
4. embedded computer board according to claim 1; It is characterized in that described embedded computer board also comprises power supply and power sense circuit; Described power supply is each module for power supply of embedded computer board, and power sense circuit is connected with processor is two-way.
5. embedded computer board according to claim 1 is characterized in that described arm processor is i.MX257.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200416598U CN202472500U (en) | 2012-02-09 | 2012-02-09 | Embedded computer main board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200416598U CN202472500U (en) | 2012-02-09 | 2012-02-09 | Embedded computer main board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202472500U true CN202472500U (en) | 2012-10-03 |
Family
ID=46920644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200416598U Expired - Fee Related CN202472500U (en) | 2012-02-09 | 2012-02-09 | Embedded computer main board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202472500U (en) |
-
2012
- 2012-02-09 CN CN2012200416598U patent/CN202472500U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20150209 |
|
| EXPY | Termination of patent right or utility model |