Figureb.3 256 kbyte interface with 150 ns memory, 256 kbyte interface with 150 ns memory – Avago Technologies LSI53C825AE User Manual

Page 289

External Memory Interface Diagram Examples

B-3

Figure B.3

256 Kbyte Interface with 150 ns Memory

LSI53C825A

27C020-15/

MOE/

MCE/

MAD[7:0]

Bus

A[7:0]

A[15:8]

MAS0/

MAS1/

Note: MAD bus sense logic enabled for 256 Kbytes of fast memory (150 ns device @ 33 MHz). Address latch

for the two most significant bits can be HCT74, HCT174, HCT175, etc.

GPIO4

MWE/

Control

+ 12 V

Optional - for Flash Memory only, not
required for EEPROMS.

28F020-15/

Socket

D[7:0]

A[17:16]

MAD2

4.7 K

MAD1

4.7 K

HCT374

GPIO2_MAS2/