Memory Interfacing

NAND (or any gate ) As decoder

‘138 ( 3x8 decoder)

‘138 ( 3x8 decoder)

‘139 ( dual 2x4 decoder)

‘139 ( dual 2x4 decoder)

Programmable Decoders

• We can Use PLA,PAL,GAL,FPGA,…

• Example PAL16L8– 10 input pins– 2 output pins ( active low)– 10 programmable pins

Two Banks of memory

Two Banks of memory

Two Banks of memory

Two Banks of memory