Please help me answering this Q :) A computer system with 24 bit address bus and

Question

Please help me answering this Q :)

A computer system with 24 bit address bus and 16 data bus microprocessor requires 7MB of memory starting at address 0H(bottom). This 7MB should be divided into 2MB of SRAM AT THE BOTTOM, 4MB of DRAM at the middle and 1MB of EPROM at the top. The avialble parts are
? 128KX16 EPROM chips
? 256kx8 SRAM chips
? 512KX4 DRAM chips
The processor provides ALL CONTROL SIGNALS MRDC, MWTC, BHE and BLE
The SRAM and DRAM chips have WE, OE and CE control inputs
The EPROM chips has OE and CE inputs
draw simple circuit diagram and label the wires in your design. Please show all calculations and drawing in a readable manner.

Explanation / Answer

SRAM

1B=221

fixed 4 levels of memory 00/01/10/11

START:0

+

010

                            

fixed 4 levels of memory 010/011/100/101

START:0110

+

00

                            

4 levels of memory 00/01/10/11

A20                                   AH A18 A1 A0 1MB EPROM START:000 0                                         0 000 0000 0000 0000 000 0 4MB DRAM

SRAM

1B=221

2MB SRAM END:000 1                                              1 111 1111 1111 1111 111 1

fixed 4 levels of memory 00/01/10/11

TO Chips

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