DEVICE FOR CONECTING MICROPROCESSOR Z80 WITH MICROCOMPUTER HIGHWAY USING COMMON DYNAMIC MEMORY

摘要

The device is applied in computing equipment. It gives the opportunity for work with chips, carrying dynamic memory of above 64kbits, requiring 256 refreshment cycles. The device contains a block Arbiter (1) navigating the access to a general dynamic memory (2) connected to navigating outlets (9,10,11,12) with an outlet "readiness of the compound memory" (15) via the first address rim (3) and address lines to a microcomputer highway (4) navigated by a microcomputer highway (4) managed by a microcomputer (5). Part of the address lines are connected with the first address multiplexor (6), while Arbiter block (1) via first navigating rim (13) is connected also with navigating outlets for microprocessor Z80 (14). The microprocessor Z80 (14) is connected via its address lines A0 to A6 and A8 to A15 (29) with a second address multiplexor (7), while via A6 (30), A7 (32) and through navigating outlets (33 and 34) - with a block for formation of a modificated address (31), whose outlet (35) is connected with the second address multiplexor (7). The outlets of both multiplexors (6 and 7) form a multiplexed address rim (8), connected with its address plugs to the general memory (2). The navigating plugs of the address multiplexors (6 and 7) are connected with outlets (18,19 and 28) to the Arbiter block (1), whose outlets (20,21 and 22) are connected via navigating plugs of the compound dynamic memory (2). Other outlets (26 and 27) of the Arbiter block (1) are connected with the plugs for navigation of a two-way data buffer (24), connected from one side (25) with the microcomputer highway (4), while on the other side (23) - with the general dynamic memory (2) and the microprocessor Z80 (14). Outlets (16 and 17) of the Arbiter block (1) are connected with navigation plugs of microprocessor Z80 (14).