KR950010948B1 - Apparatus and method for relaying data in vesa local system - Google Patents

Abstract

The data relay method for a vesa local system includes the steps of: receiving data from a number of transmitters; deciding data transmission direction according to the transmission data received from the first step; constructing a transmission line in order to transmit the received data to a receiver which the transmitter wants, according to the direction decided in the second step.

Description

Method and apparatus for data relay in Besa local system

1 is an illustration of a conventional Besa local system.

2 is an exemplary diagram of a Besa local system according to the present invention.

* Explanation of symbols for main parts of the drawings

10: CPU 20: Besa Master Card

300: Besa slave card S1 ~ S3: Besa expansion slot

100: buffer unit 110, 120, 130, 140: bidirectional buffer

200: buffer control unit

The present invention relates to a data relay method of a Besa local system, and in particular, to reduce the load load between the CPU and the data bus connected to the data input and output terminals of the CPU, and to control the direction of data transmission and reception between the CPU and the expansion slot for the Besa local system. A method and apparatus for data relay in a Besa local system.

The conventional Besa local system is a CPU 10 that can process data in 32-bit, as shown in Figure 1, and performs 32-bit parallel data transmission and reception with various computer peripherals through a 32-bit data bus, A Besa expansion slot that is connected to three 32-bit data buses connected to the data input / output terminals D0 to D31 of the CPU 10 to provide peripherals for peripheral devices (video cards, hard disk drivers, etc.) for the Besa local system. (S1, S2, S3), and the Besa master card 20, which acts as a master capable of giving a specific operation command to the CPU 10 among the Besa local system peripherals, and the Besa local system peripherals. Among them, a Besa slave card 30 that operates only under the control of the CPU 10 and the Besa master card 20 is configured.

In the conventional Besa local system configured as described above, the 32-bit data bus connected to the data terminal of the CPU 10 includes the three Besa expansion slots S1, S2, and S3, pull-up resistors, memory buffers, and cache memories. Each device is connected in parallel, one by one. In addition, in the method of controlling the transfer direction of data carried on the data bus, when the Besa master card mounted in the CPU 10 and the Besa expansion slot S1 transmits and receives data, the CPU 10 and the Besa master card respectively. When the Besa slave card 30 mounted on the CPU 10 and the Besa expansion slot S3 transmits and receives data, the CPU 10 performs all control operations, and the Mesa slave card 30 and the Besa master card. When the 20 transmits and receives data to each other, it is common to perform all control operations in the Besa master card 20.

In the conventional Besa local system, in addition to the existing peripheral devices, three Besa expansion slots are connected to the data terminals of the CPU through one data bus, thereby increasing the load required for the data bus. When the peripheral device for the local system is mounted on all of the Besa expansion slots, the operation of the entire system becomes unstable. In addition, when two Besa local system peripheral devices mounted in the Besa expansion slot transmit and receive data with each other, data from a peripheral device connected to another data bus cannot be prevented from being introduced. There is also a problem that can occur.

An object of the present invention for solving the above problems is to connect only one data bus connected to a data input / output terminal of the CPU 10 with a buffer and three data buses connected to the buffer and three Besa expansion slots. By reducing the number of data buses connected to the data input / output terminals of 10), it reduces the load due to the data bus connection and controls the data transfer direction between the CPU 10 and peripheral devices mounted in the Besa expansion slot through control of the buffer. The present invention provides a method and apparatus for data relay in a Besa local system, which is adapted to prevent collisions during data transmission and reception.

A feature of the present invention for achieving the above object is a method for transmitting data in a Besa local system, comprising: a first step of receiving data generated and transmitted from a plurality of data transmitters; A second step of determining a data transmission direction according to the received transmission data, and a third step of forming a transmission path so that the preferred transmitting side can transmit the data to the desired receiving side according to the transmission direction determined in the second step. To include the steps.

Another feature of the present invention for achieving the above object is a CPU capable of parallel data transmission and reception with a plurality of bits and a predetermined number of data buses and a video card for use in a Besa local system. A Besa local system having a plurality of Besa expansion slots for providing connection terminals to an input / output device, the Besa local system comprising: a plurality of Besa expansion slots connected to an arbitrary first data bus of the predetermined number of data buses connected to a data input / output terminal of the CPU; A data bus is provided to each of the Besa expansion slots, and when the data output through the first data bus is supplied from the CPU, the data bus is transferred to the plurality of Besa expansion slots, and the data output through the plurality of Besa expansion slots is supplied. When receiving, the buffer unit for delivering to the CPU side, the CPU and the plurality of It includes a buffer control unit for receiving information about the data transmission and reception side applied from the peripheral device for the Besa local system mounted in the Besa expansion slot to control the data transfer operation of the buffer unit.

In addition, an additional feature of the present invention for achieving the above object is that the buffer unit forms a plurality of bit groups of a plurality of bits of data output from the CPU through the first data bus under the control of the buffer control unit. And a predetermined number of bidirectional buffers which transmit the data to the plurality of Besa expansion slots, form a plurality of bits of data output through the plurality of Besa expansion slots, and transmit the data to the CPU side. have.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exemplary diagram of a Besa local system according to the present invention, which is capable of processing data in 32 bits and performs 32-bit parallel data transmission / reception with various computer peripherals through a 32-bit data bus, Bessa expansion slot (S1 ~ S3) that connects to the three 32-bit data bus provided by the buffer unit 100 to project the connection terminal to peripheral devices (video card, hard disk driver, LAN card, etc.) for the Besa local system. And a Besa master card 20 capable of giving a specific operation command to the CPU 10 among the peripheral devices for the Besa local system, and the Besa master card 20 of the CPU 10 and the Besa master card 20 from the peripheral devices for the Besa local system. A 32-bit data bus connected to the data input / output terminal of the CPU 10 and the Besa slave card 30, which can be operated only by the control, is allocated, and a 32-bit data bus is assigned to the Besa expansion slots S1 to S3. The data provided to the data bus from the peripheral device for the Besa local system mounted on the CPU 10 or the Besa expansion slots S1 to S3, respectively, is supplied to either the Besa expansion slots S1 to S3 or the CPU 10 side. It consists of a buffer unit 100 to be delivered to, and a buffer control unit 200 for controlling the data transfer operation of the buffer unit 100.

A data transmission / reception operation between a CPU and an input / output device mounted on the Besa expansion slot in the Besa local system according to the present invention configured as described above will be described below.

There are six possible cases of data transmission and reception between the Besa master card 20 and the Besa slave card 30 mounted in the CPU 10 and the Besa expansion slots S1 to S3. When data is sent to the Besa slave card 30, when the data of the Besa slave card 30 is received by the CPU 10, and when the data is sent from the CPU 10 to the Besa master card 20 via the CPU bus. Is used to transmit data from the Besa master card 20 to the CPU 10 via the CPU bus, and is transmitted from the Besa master card 20 to the CPU 10 via the CPU bus. And the case where data is transmitted from the Besa master card 20 to the Besa slave card 30, and when the data of the Besa slave card 30 is received from the Besa master card 20.

First, when the CPU 10 receives the data of the Besa slave card 30, the CPU 10 requests the Besa slave card 30 to transmit a predetermined data and sets the read / write signal W / R low. The Besa slave card 30 outputs an active signal indicating the start of operation (ED is low) to the low state and simultaneously transmits 32-bit data through the Besa expansion slot S3 and the data bus.

The buffer control unit 200 inputs the active signals (DE is low state) output from the Besa slave card 30 and the read write signal (W / R is low state) output from the CPU 10 to the input terminals DE and W /. The high level active signal is not inputted from the Besa master card 20 through the remaining input terminal VM, and outputs a low level voltage through the output terminal DIR.

On the other hand, 32-bit data transmitted from the Besa slave card 30 is supplied to the input / output terminal B of the bidirectional buffer 110 up to 0 to 7th bit, and the 8 to 15th bit is the input / output terminal of the bidirectional buffer 120. In (B), the 16th to 23rd bits are supplied to the input / output terminal B of the bidirectional buffer 130, and the 24th to 31st bits are supplied to the input / output terminal of the bidirectional buffer 140. Each bidirectional buffer 110, 120, 130 and 140 receive the low level voltage output from the buffer control unit 200 and then output the data supplied to the input / output terminal B through the input / output terminal A. FIG.

Thereafter, 32-bit data output from each of the bidirectional buffers 110, 120, 130, and 140 is transferred to the CPU 10 through a data bus connected to the input / output terminals D0 to D31 of the CPU 10.

Secondly, when data is transmitted from the Besa master card 20 to the CPU 10 by the CPU bus, the Besa master card 20 sends a signal to the CPU 10 to transmit data through the CPU bus and starts operation. Ali transmits 32-bit data through the Besa expansion slot (S1) and the data bus with the output of the active signal (VM low). The buffer controller 200 receives an active signal (VM is low) and a read write signal (W / R is high) output from the Besa master card 20 and outputs a low level voltage through the output terminal DIR. The bidirectional buffers 110, 120, 130, and 140 are low-level voltages from the buffer control unit 200 in a state where 32 bits of data transmitted from the Besa master card 20 are supplied through 8 input / output terminals B, respectively. When is supplied, the 8-bit data supplied through the input / output terminal A is output. Thereafter, the CPU 10 receives four 8-bit data, that is, 32-bit data, output from the bidirectional buffers 110, 120, 130, and 140, respectively, through the data bus.

Thirdly, in case of data transmission and reception between the Besa master card 20 and the Besa slave card 30, the Besa master card 20 notifies the Besa slave card 30 of data transmission or requests data transmission, and outputs an active signal. 32bit data is sent or only active signal is output.

Since the Besa slave card 30 receives any signal from the Besa master card 20 to inform the data transmission and a signal for requesting data transmission, the Besa slave card 30 outputs an active signal, so that the buffer control unit 200 input terminals DE and VM. The low level signal is outputted by receiving the active signal of the low state output from the Besa master card 20 and the Besa slave card 30 through. The bidirectional buffers 110, 120, 130, and 140 receive low-level signals, respectively, and pass the data transfer paths of the buffers so that data flowing through the input / output terminal A does not leak to the input / output terminal B. To the input / output terminal (A).

Thereafter, the Besa master card 20 transmits data to the Besa slave card 30 or receives data transmitted from the Besa slave card 30.

In the first to third cases described above, the bidirectional buffers 110, 120, 130, and 140 transfer data from the input / output terminal B to the input / output terminal A by the low level output of the buffer control unit 200. In the case where the connection is made, the CPU 10 transmits data to the Besa slave card 30 and the CPU 10 transmits data to the Besa master card 20 via the CPU bus. The buffer controller 200 receives only the active signal output from the Besa slave card 30 through the input terminal DE, or the Besa master card 30 and the CPU 10 through the input terminals VM and W / R. ) Receives the active signal and the read / write signal. As such, when the active signal or the active signal and the read / write signal are input to the input terminal DE or the input terminals VM and W / R of the buffer controller 200, the buffer controller 200 outputs a high level voltage. Since the bidirectional buffers 110, 120, 130, and 140 connect a data transmission path from the input / output terminal A to the input / output terminal B, the data transmitted from the CPU 10 may be received by the Besa slave card 30. The data transmitted by the CPU 10 via the CPU bus can be received by the Besa master card 20.

As described above, the present invention provides a data bus for the Besa expansion slot in the buffer unit and performs data transmission and reception between the CPU and a plurality of Besa expansion slots using only one data bus connected to the data input / output terminal of the CPU. This reduces the load load between the CPU and the data bus connected to the CPU, and prevents the inflow of external data by the buffer unit during data transmission and reception between devices mounted in the Besa expansion slot, enabling the entire Besa local system to operate stably. It has the effect of making it work.

Claims (3)

A data transmission method in a Besa local system, comprising: a first step of receiving data generated and transmitted from a plurality of data transmitting parties; A second step of determining a data transmission direction according to the transmission data authorized in the first step; And a third step of forming a transmission path so that the preferred transmission side can transmit data authorized to the desired reception side according to the transmission direction determined in the second step. . Multiple Besa expansion slots provide connection terminals for input / output devices such as a CPU capable of parallel data transmission and reception with a plurality of bits and a predetermined number of data buses and a video card used in a Besa local system. In the Besa local system provided, connected to any one of the predetermined number of data buses connected to the data input and output terminals of the CPU to provide a data bus to the plurality of Besa expansion slots, respectively, A buffer unit configured to transfer data output through the first data bus to the plurality of Besa expansion slots and to deliver the data output through the plurality of Besa expansion slots to the CPU; And a buffer controller configured to control the data transfer operation of the buffer unit by receiving information about a data transmission and reception side applied from the CPU and peripheral devices for the Besa local system mounted in the Besa expansion slots. Data relay on Besa local system. 3. The apparatus of claim 2, wherein the buffer unit forms a plurality of bits of data output from the CPU through the first data bus under a control of the buffer controller to form a predetermined number of bit groups, and transmits the data to the plurality of Besa expansion slots. And a predetermined number of bidirectional buffers configured to transfer a plurality of bits of data output through the plurality of Besa expansion slots into a predetermined number of bit groups to the CPU. Device.