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LSI53C875A PCI to Ultra SCSI Controller B-1
Appendix B
External Memory
Interface Diagram
Examples
Appendix B has example external memory interface diagrams.
Figure B.1 16 Kbyte Interface with 200 ns Memory
LSI53C875A
27C128
MOE/
OE
MCE/
CE
D0
8
MAD[7:0]
Bus
CK
Q0
8
A[7:0]
QE
6
A[13:8]
V
DD
MAS0/
MAS1/
Note: MAD[3:1] pulled LOW internally. MAD bus sense logic enabled for 16 Kbyte of slow memory (200 ns
devices @ 33 MHz).
HCT374
D[7:0]
MAD0
4.7 K
D7 Q7
D0
CK
Q0
QE
HCT374
D5 Q5