Question

(40) Design 64k x 8 of memory starting at location 2000h. Us either 16k x 8 Ram or 8k x 8 Ram memories for this. Use the decoder below plus any additional circuitry as necessary. Assume 2 additional address than needed for your design ((log2( total memory)+2) address lines) 2 1. BIN OCT EN

Answer 1

The decoder below plus any additional circuitry as necessary

To design memory we could require 4 16: kX8 memory chips and for 2 additional addresses one more chip so total 5 chips will require.

Binary octal decoder is used we can connect three address lines to this decoder to generate address map.

16K x 8 memory requires 1 address lines.

A0 to A3 address lines are required.

Here,

But designing memory required 17 address lines.

A0 to A 16

Starting address 02000h.

for decoder circuit are inputs are outputs. E is active high eanable, it has to connect logic high or +ve and active low enable should be connected to logic low or ground.