CN102708083B - Peripheral component interconnect (PCI) interface device capable of distributing interface address of low order input and output interface - Google Patents

Abstract

The present invention is a PCI interface device capable of distributing the interface addresses of low-level input and output ports, which includes an addressing circuit, a PCI controller connected to the addressing circuit and a PCI interface port, and a PCI controller connected to the PCI controller. Device and a device controller of a device interface port; wherein the addressing circuit sets an interface address, and the PCI controller adds a data from the device interface port controller to the interface address and transmits it to a PCI with a PCI transceiver program interface port, and receive the data marked with the above-mentioned interface address from the PCI interface port, then take the data out and send it to the device controller, and the device controller converts the corresponding device interface port data to the device interface port; Therefore, the present invention can use the interface address of the low-order input and output ports for data transmission.

Description

A PCI interface device that can assign the interface address of the low-level input and output ports

technical field

The invention relates to a computer interface device, especially a PCI interface device capable of allocating the interface addresses of low-order input and output ports.

Background technique

In a traditional microcomputer system, it communicates with users through input devices and output devices; among them, the above-mentioned input devices are more common with a mouse or a keyboard; and in terms of output devices, there are screen monitors, speakers or printers; however, Whether it is an input device or an output device, at least one computer interface will be in contact with the above-mentioned microcomputer system. These interfaces are called "ports" (Port); It is to send the data to the output device; and for the commonly used input devices and output devices, the early AT/286/386/486 microcomputer systems all defined and built-in the interface address corresponding to the port, please refer to the table below Show:

000～01F No. 1 DMA controller (8237) 200～207 GAME I/O 020～03F No. 1 interrupt controller (8259A) 278～27F LPT2 022～012 CHIPSET Control Registers.I/O port. 2B0～2DF GRAPHICS Adapter Controller 040～05F Timer(8254) 2F8～2FF COM2 060～06F Keyboard control IC(8742) 300～31F Prototype Card 070～07F Real Time Colck and NMI Interrupts 360～36F PC network 080～09F Page buffer for DMA (74LS612) 378～37F LPT1 0A0～0BF No. 2 interrupt controller (8259A) 380～38F SDLC communication/binary synchronous communication (No. 2) 0C0～0DF No. 2 DMA controller (8237) 3A0～3AF SDLC communication/binary synchronous communication (No. 1) 0F0 BUSY signal for clear math coprocessor 3B0～3BF Black and white screen and printer adapter card 0F1 To Reset the math coprocessor 3C0～3CF EGA card 0F8～0FF Math coprocessor 3D0～3DF Color Graphics Screen Adapter (CGA) 1F0～1F8 hard drive 3F0～3F7 Floppy Disk Drive Control Adapter Card 3F8～3FF COM1

AT/286/386/486 Interface Address Correspondence Table

As can be seen from the above table, the above-mentioned microcomputer system has at least 27 sets of basic commonly used interface addresses built in for the low-level input and output ports (Legacy I/O Port) used by various devices, such as 0x278~0x27F, 0x378~0x37F Interface addresses such as 0x3BC～0x3BF are used to provide printers or other devices using parallel ports (Parallel Port); therefore, the current microcomputer system still reserves these interface addresses to provide these ports, so that the microcomputer system can use these ports. Ports are interconnected with their traditional industrial counterparts.

With the rapid development of current technology, various microcomputer systems adopt relatively new interface ports, such as the relatively new PCI or PCIe interface ports; so once the above-mentioned microcomputer system is upgraded or replaced, the original low-order input and output ports, For example, industrial equipment such as parallel ports and serial ports cannot be used in connection with the current microcomputer system. Although there is currently a PCI adapter card that converts a PCI port into a low-level input and output port on the market, because the PCI or PCIe interface port is a plug-and-play architecture, the resources or interface addresses of its input and output ports are reassigned by the microcomputer system. , and the current microcomputer system is not set to assign the interface address of the low-level input and output ports to the PCI adapter card; The interface addresses of the low-order input and output ports further cause the interface addresses of these low-order input and output ports to be unusable. Therefore, it is necessary to further improve the above situation.

Contents of the invention

In view of the PCI adapter card that the above-mentioned PCI port turns to the low-order input-output port, the interface address of the low-order input-output port cannot be used; so the main purpose of the present invention is to provide a PCI interface device that can distribute its interface address of the low-order input-output port .

The main technical means used in order to achieve the above purpose is to make the PCI interface device that can assign the interface address of the low-order input and output ports, which includes:

An addressing circuit is configured to set an interface address with at least one set of low-order input and output ports;

A PCI controller is connected to the addressing circuit and a PCI interface port, and reads the interface address of a group of low-order input and output ports set by the addressing circuit; wherein the PCI controller uses PCI to send and receive The program adds a data to the interface address and transmits it to the PCI interface port, and receives data marked with the interface address from the PCI interface port; and

A device controller is connected to the PCI controller and a device interface port; converts the above-mentioned data into device data corresponding to the device interface port, and transmits the above-mentioned device data to the device interface port; The port receives the device data and converts the data to the PCI controller.

It can be seen from the above structure that the PCI controller of the present invention reads the interface address of one of the low-order input and output ports set by the addressing circuit, and adds the interface address to the data and sends it to the PCI On the interface port; therefore, the aforementioned microcomputer system can access traditional industrial equipment through the interface address of the low-order input-output port, and then can use the interface address of the low-order input-output port.

Description of drawings

FIG. 1 is a schematic circuit diagram of a PCI interface device capable of assigning interface addresses of low-order input and output ports according to the present invention.

FIG. 2 is a timing diagram of writing data into the microcomputer system by the PCI interface device of the present invention.

FIG. 3 is a timing diagram of the PCI interface device of the present invention reading data from the microcomputer system.

FIG. 4 is a schematic diagram of the structure of the PCI interface device of the present invention applied to an adapter card.

Description of main component symbols:

10: addressing circuit; 11: address selection switch;

20: PCI controller; 21: PCI interface port;

30: device controller; 31: device interface port;

40: PCI device identifier.

Detailed ways

In order to facilitate the understanding of the structure of the PCI interface device of the present invention, the following description is made in conjunction with the accompanying drawings and embodiments.

Please refer to shown in Fig. 1, for the present invention can distribute the PCI interface device of its interface address of low order input and output port, it comprises:

An addressing circuit 10 is configured with at least one group of interface addresses of low-order input and output ports; in this embodiment, the addressing circuit 10 has a built-in complex array of interface addresses, and is connected to an address selection switch 11, by The address selection switch 11 sets one group of interface addresses of the addressing circuit; wherein the range of the interface addresses of the above-mentioned low-order input and output ports is selected from the address range of 0x000～0x7FF; and in the present embodiment, the above-mentioned addressing circuit 10 has three built-in interface addresses (0x278～0x27F, 0x378～0x37F and 0x3BC～0x3BF);

A PCI controller 20 is connected to the addressing circuit 10 and a PCI interface port 21, and reads the interface address of one group of low-order input and output ports set by the addressing circuit 10; wherein the PCI controller 20 is to add a data to this interface address and send to this PCI interface port 21 with the PCI transceiver program, and receive the data marked with the above-mentioned interface address from this PCI interface port 21; In the present embodiment, this PCI interface port 21 includes a PCI data bus (AD) and a PCI control bus (Frame, C/BE, IRDY, Devsel and TRDY), and the PCI controller 20 controls the PCI control bus when executing the PCI transceiver program, and the data and the transmitting an interface address to the PCI data bus, and receiving data marked with an interface address from the PCI data bus; and

A device controller 30 is connected to the PCI controller 20 and a device interface port 31; converts the above-mentioned data into device data corresponding to the device interface port 31, and transmits the above-mentioned device data to the device interface port 31; Receiving device data from the device interface port 31 and converting the data into the PCI controller 20; in the present embodiment, the device interface port 31 is a parallel port (LPT1) corresponding to the aforementioned interface address (0x378～0x37F) .

Please refer to Figure 2 and Figure 3, when the PCI controller intends to read and write the microcomputer system with the PCI read and write program through the interface address (0x378) of the low-level parallel port (LPT1), it is to make the PCI controller The bus (Frame, C/BE, IRDY, Devsel, and TRDY) generates corresponding signals, and transmits its interface address (0x378) to the microcomputer system through the PCI data bus (AD); then wait until the microcomputer is through When the PCI control bus responds to the PCI controller 20, the PCI controller 20 transmits data with the microcomputer system through the PCI data bus.

Furthermore, because the current PCI interface port 21 is used in the microcomputer system, the computer system scans and confirms whether a device is inserted into the PCI interface port 21 before inserting it through the aforementioned control bus and data bus. The equipment of PCI interface port 21 reads and writes; Therefore, if only the present invention is inserted into PCI interface port 21 in the microcomputer system separately, and when not using with any equipment simultaneously; This microcomputer system can not send any because of the present invention The device serial number is provided to the microcomputer system to allocate resources and interface addresses; then, the supply of the frequency signal (Clock) is immediately stopped, and various reading and writing actions cannot be performed; therefore, the low-level The PCI interface device of the interface address of the input and output port further includes:

A PCI device identifier 40 is electrically connected to the PCI controller 20, and outputs a device serial number to the PCI controller 20; wherein the PCI controller 20 outputs the received device serial number to the PCI interface port 21; In this embodiment, the PCI device identifier 40 is a PCI-to-ISA bridge.

Because the PCI controller 20 can output the device serial number to the PCI interface port 21 through the PCI device identifier 40 ; therefore, the aforementioned microcomputer system can know that there is indeed a device inserted into the PCI interface port 21 .

Please refer to Fig. 4, which is a typical example of the present invention being specifically applied to an adapter card, wherein the above-mentioned address selection switch 11 is a dip switch and is integrated into the same adapter card together with the present invention; if the user needs When switching to use different low-level input and output port addresses, such as parallel ports (LPT1, LPT2 or Print Port); you can select the switch 11 by switching the address, and then correspondingly output the interface addresses of different input and output ports, such as 0x378, 0x278 , 0x3BC; in this way, it is convenient for the user to adjust the corresponding interface address according to the current device interface port; moreover, the addressing circuit 10 can select and output one of the low-order input and output ports according to the address selection switch 11 In addition to the interface address, an address setting program can also be directly built in for setting the at least one group of interface addresses; in this embodiment, the above-mentioned address selection switch 11 is configured with a designated switch for the use of the above-mentioned address setting program; When the designated switch is turned on, the addressing circuit 10 selects its interface address through the address setting program; and when the designated switch is turned off, the addressing circuit 10 selects its interface address through the address selection switch 11.

In summary, the PCI controller 20 of the present invention directly sends the data to the PCI interface port 21 through the interface address provided by the addressing circuit 10; The interface address of the I/O port enables the PCI interface device to effectively use the interface address of the low-order I/O port.

Claims (5)

1. a kind of PCI interface device that can distribute its interface address of low order input and output port, it comprises: An addressing circuit further includes an address setting program, the addressing circuit is connected to an address selection switch, the addressing circuit is used to select the address selection switch or the address setting program, the address selection switch and the address setting The program sets the interface address of at least one group of low-level input and output ports; A PCI controller is connected to the addressing circuit and a PCI interface port, and reads the interface address of a group of low-order input and output ports set by the addressing circuit; wherein the PCI controller uses PCI to send and receive The program adds a data to the interface address and transmits it to the PCI interface port, and receives data marked with the above-mentioned interface address from the PCI interface port; A device controller is connected to the PCI controller and a device interface port; converts the above-mentioned data into device data corresponding to the device interface port, and transmits the above-mentioned device data to the device interface port; The port receives the device data and converts the data to the PCI controller; and A PCI device identifier is electrically connected to the PCI controller, and outputs a device serial number to the PCI controller, and the PCI controller outputs the received device serial number to the PCI interface port. 2. The PCI interface device capable of assigning the interface address of the low-order input and output ports according to claim 1, wherein the address selection switch is a dip switch. 3. The PCI interface device according to any one of claims 1 to 2, wherein the interface address of the low-order input and output ports is selected from the address range of 0x000～0x7FF. 4. The PCI interface device capable of assigning interface addresses of low-level input and output ports according to claim 1, the PCI device identifier is a PCI-to-ISA bridge. 5. the PCI interface device according to any one of claims 1 to 2 that can assign its interface address of low-order input and output ports, the PCI interface port includes a PCI data bus and a PCI control bus, and the PCI controller When executing the PCI transceiver program, control the PCI control bus, transmit the data and the interface address to the PCI data bus, and receive data marked with the interface address from the PCI data bus.