CS272652B1 - Extended synchronous bus-bar connection for microcomputer system's extension - Google Patents

Abstract

The design concerns the connection of extended synchronous bus extension of the microcomputer system. The connection is arranged in such a way that the controller of the synchronous bus, which is connected to the bus of the microcomputer, creates signals of its own synchronous bus, which can be connected in parallel with 1 to 8 generators of local input/output buses within the distance of at most 10 m.<IMAGE>

Description

(57)

The solution relates to the wiring of an extended synchronous bus for expanding the microcomputer system. The wiring is designed so that the synchronous bus controller connected to the microcomputer bus generates its own synchronous bus signals to which 1 to 8 local I / O bus generators can be connected in parallel for a maximum distance of 10 m.

Italy (11) (13) 81 (51) Int. whose. ⁵ G 06 F 3/00, G 06 F 13/00

CS 272 652 Bl

The invention relates to an extended synchronous bus for extending a microcomputer system that allows the microcomputer system to be expanded by additional I / O units.

Previously known principles of expansion of microcomputer systems were solved either as bus repeaters for minimal distances or as asynchronous bus for connecting more distant input / output units of the system. The disadvantage of bus repeaters is that they do not allow the bus to be extended over a longer distance. The disadvantage of asynchronous buses is the slower operation of remotely connected I / O units and their more complicated program operation. Another disadvantage is also the diversity of the program operation of the I / O units connected directly in the system or on the asynchronous bus.

The above-mentioned drawbacks are eliminated by the wiring of the extended synchronous bus according to the invention, characterized in that the microcomputer bus is connected via its synchronous bus controller to its own synchronous bus, to which at most eight local I / O bus generators are connected in parallel.

The advantage of wiring is that it allows the buses to be extended over a longer distance, speeds up the operation of remotely connected I / O units and simplifies program operation. Another advantage is the unification of software for I / O units connected directly in the system or on an extended synchronous bus.

The attached drawing shows a block diagram of the circuit according to the invention.

In addition to the bus of the microcomputer, the synchronous bus controller 2 and the actual synchronous bus 3 are connected to which 1 to 8 generators of the 4-local I / O bus 5 can be connected in parallel.

The function of the connection according to the invention is as follows: the synchronous bus controller 2 connected to the bus 1 of the microcomputer generates data signals D _q - D _? Based on the address signals A _q - A · _? and the I / DR, I / OW, STSTB, RESET, 02, INT, INTE, READY, RESIN service signals generated by the microcomputer central unit signals of the synchronous bus 3 itself.

The actual synchronous bus 3 consists of an impedance-defined twist line with a characteristic impedance of 90 Ohms, a maximum length of 10 m. The following signals are transmitted via the synchronous bus itself:

SA _q - SAy - unit address on local I / O bus SAG _Q - SAG-j- address of local I / O bus generator SD _Q - SDy - bidirectional data signals

SIG _q - SIG? - Interrupt test on local I / O bus

SRq - SRy - group of control and control signals of own synchronous bus

SRD, SRW - read / write strobe signals

OV - common conductor of all signals

All the lines of the synchronous bus 3 to which I to 8 local input generators 6 can be connected in parallel (the output bus 5 is terminated by an impedance matching block). These generators 4 produce all the necessary signals of the local input / output bus 5 The signals on the local I / O bus 5 are identical - level, temporal and semantic - to the bus signals _1 of the microcomputer.The wiring of the extended synchronous bus for the expansion of the microcomputer system can be used primarily in technological control systems where input and output signals, the arrangement of which can be dispersed into multiple assemblies, racks, cabinets closer to controlled processes.

Claims (1)

SUBJECT OF THE INVENTION Extended synchronous bus connection for extending the microcomputer system, characterized in that the bus (1) of the microcomputer is connected via the synchronous bus controller (2) to its own synchronous bus (3), to which at most B generators (4) of local inputs are connected. output buses (5).