CN2461051Y

CN2461051Y - Converter of computer PCI bus and ISA bus

Info

Publication number: CN2461051Y
Application number: CN 00267027
Authority: CN
Inventors: 姚大志
Original assignee: Purple Mountain Observatory of CAS
Current assignee: Purple Mountain Observatory of CAS
Priority date: 2000-12-22
Filing date: 2000-12-22
Publication date: 2001-11-21
Anticipated expiration: 2010-12-22

Abstract

The utility model relates to a converter of a PCI bus line and an ISA bus line of a computer. First, a data line and an address line is separated, and unused data address lines are treated by using pulling down resistor. Thereby, a fully decoded system is formed. The number of functional control lines which is externally arranged is 8 among the PCI bus line, and the number of functional control lines which is externally arranged is 3 among the ISA bus line. The 8 control lines can be converted to 3 control lines according to the conversion mechanism of the control lines. The converter is composed of an ordinary IC, and has the advantages of simple structure, and convenient operation. The PCI bus line and the ISA bus line can be in bridge joint. An original ISA pluggable unit and a peripheral plate can be continuously used after adopting PCI bus line at the time of upgrading computer. Thereby, large funds can be saved.

Description

The converter of computer PCI bus and isa bus

The utility model relates to the converter of a kind of computer PCI bus and isa bus.

Along with development of computer, the speed of computing machine is more and more faster, in order to adapt to this requirement, must adopt new bus mode, and for example new pci bus that is born is adopted by most computers now.But, use the multiple Peripheral Interface of traditional isa bus still to exist.Be connected with new the supporting of computer bus in order to solve these equipment, many computer manufacturers and IC make the commercial city and have produced special IC bridgt circuit in succession, though this bridgt circuit can be finished the mutual conversion of two kinds of buses, but their pin is too many, for example 823,8EB etc. is 208 pin, simultaneously be again the paster encapsulation, be difficult to generally speaking use.Renewal along with computing machine, a lot of novel computers have had the PCI slot, the peripheral hardware plate of the ISA of Gou Maiing (particularly those special uses, that price is high peripheral hardware plate) just can't use before this, and pci bus than the isa bus complexity many, general computing machine personnel are unfamiliar with, and can't directly utilize common pci bus to come the product of development and Design oneself.Present working practice need be found a kind of common IC formation of utilizing, and the circuit devcie that element is few again gets up pci bus and isa bus bridge joint, can make more original special peripheral hardware plates can continue to use again so that upgrading computer is regenerated.Simultaneously, a deisgn product on the isa bus platform is provided for the computing machine personnel that are familiar with isa bus, that moves on pci bus may.But still there is not this device in the prior art.

Task of the present utility model is to satisfy above-mentioned actual needs, provides a kind of and is made of common IC, and is simple in structure, easy to use, again the converter that pci bus and isa bus bridge joint can be got up.This converter has been arranged, just can be after upgrading computer adopts pci bus, original ISA plug-in unit and peripheral hardware plate all can continue to use, can save substantial contribution, and a deisgn product on the isa bus platform is provided for the computing machine personnel be familiar with isa bus, that moves on pci bus makes things convenient for condition.

The technical scheme that realizes above-mentioned task is: in isa bus, peripheral hardware decoding needs only D0-D7, A0-A9, and RESET, OSC, AEN, IOR, IOW, totally 23, and data line separates with address wire.In pci bus, data line and address wire are compound, are compound bus.Pci bus is 32, and is decoded as complexing address decoding.The technical program is earlier data line to be separated with address wire, no data/address line is handled with pull down resistor, to constitute fully decoded system.The control line that in the pci bus peripheral hardware is worked has 8: CO-C3, FRAME, DEVSEL, IRDY, TRDY.There are 3 to what peripheral hardware worked in the isa bus: AEN, IOR, IOW.This programme converts 3 by their switching mechanism to 8 simultaneously, promptly can use.For example, can adopt following circuit: be provided with integrated circuit (IC) chip U1, U2, U3, for example 16V8 is connected (the concrete connection seen embodiment) respectively with pci bus, isa bus.

The pci bus that the utility model provides and the converter of isa bus are made of common IC, and be simple in structure, easy to use, pci bus and isa bus bridge joint can be got up again.This converter has been arranged, just can be after upgrading computer adopts pci bus, original ISA plug-in unit and peripheral hardware plate all can continue to use, can save substantial contribution, and a deisgn product on the isa bus platform is provided for the computing machine personnel be familiar with isa bus, that moves on pci bus makes things convenient for condition.

Now be described further with embodiment in conjunction with the accompanying drawings.

Fig. 1 is the design's fundamental diagram;

Fig. 2 is the circuit diagram of embodiment 1.

Embodiment 1, with reference to Fig. 1, Fig. 2: be provided with integrated circuit (IC) chip U1, U2, U3 respectively with pci bus, isa bus connects: the D0-D7 of isa bus meets the AD0-AD7 of pci bus respectively, and be connected with the 2-9 pin of integrated circuit (IC) chip U2, the IOW of isa bus, IOR, the AEN line is connected with the 16-18 pin of chip U1 respectively, the AO-A7 pin is connected with the 19-12 pin of chip U2 respectively, A8, A9 respectively with 19 of chip U3,18 pin connect, the OSC line is connected with 19 pin of chip U1, the RESET line is connected the CLK of pci bus, DEVSEL with 12 pin of chip U3, FRAME, CO-C3, IRDY, TRDY line are connected with the 1-9 pin of chip U1 respectively, AD8, the AD9 line respectively with 2 of chip U3,3 pin connect, the RST line is connected with 8 pin of chip U3,10 pin ground connection of three chips, 20 pin meet VCC, and 12 pin of chip U1 connect 1 pin of chip U2 and 1 pin of chip U3 simultaneously.Here said three chips can adopt 16V8 or other equivalent electrical circuit chips.

Claims

1, the converter of a kind of computer PCI bus and isa bus is provided with integrated circuit (IC) chip and is connected with pci bus, isa bus respectively, it is characterized in that: data line is separated with address wire, no data/address line is handled with pull down resistor, to constitute fully decoded system, with 8 control line: CO-C3 that in the pci bus peripheral hardware worked, FRAME, DEVSEL, IRDY, TRDY converts 3 control line: AEN that in the isa bus peripheral hardware worked to, IOR, IOW.

2, converter according to described computer PCI bus of claim 1 and isa bus, it is characterized in that: physical circuit is, be provided with integrated circuit (IC) chip U1, U2, U3, the D0-D7 of isa bus meets the AD0-AD7 of pci bus respectively, and be connected with the 2-9 pin of chip U2, the IOW of isa bus, IOR, the AEN line is connected with the 16-18 pin of chip U1 respectively, and the AO-A7 pin is connected A8 with the 19-12 pin of chip U2 respectively, A9 respectively with 19 of chip U3,18 pin connect, the OSC line is connected with 19 pin of chip U1, the RESET line is connected the CLK of pci bus, DEVSEL with 12 pin of chip U3, FRAME, CO-C3, IRDY, TRDY line are connected with the 1-9 pin of chip U1 respectively, AD8, the AD9 line respectively with 2 of chip U3,3 pin connect, the RST line is connected with 8 pin of chip U3,10 pin ground connection of three chips, 20 pin meet VCC, and 12 pin of chip U1 connect 1 pin of chip U2 and 1 pin of chip U3 simultaneously.

3, according to the converter of claim 1 or 2 described computer PCI bus and isa bus, it is characterized in that: said integrated circuit (IC) chip adopts 16V8 or other equivalent electrical circuit chips.