Avago Technologies LSI8751D - Manual (Page 16)

1-2 General Description
The LSI53C875 is a pin-for-pin replacement for the LSI53C825 PCI to
SCSI I/O processor, with added support for the SCSI-3 Ultra standard as
well as other new features. Some software enhancements are needed to
take advantage of the features and Ultra SCSI transfer rates supported
by the LSI53C875. The LSI53C875 performs Ultra SCSI transfers or fast
8- or 16- bit SCSI transfers in Single-Ended (SE) or differential mode,
and improves performance by optimizing PCI bus utilization. A system
diagram showing the connections of the LSI53C875 with an external
ROM or Flash memory is pictured in
Figure 1.1 .
Figure 1.1 LSI53C875 External Memory Interface
PCI Bus
SCSI Bus
BIG_LIT
LSI53C875
GPIO2_MAS2/
MAS1/
MWE/
MOE/
MCE/
MAD[7:0]
MAS0/
GPIO4
V
PP
Translator
V
PP
(Optional)
V
PP
HCT374
HCT374
HCT374
ROM or Flash
D[7:0]
A[7:0]
A[15:8]
A[19:16]
(Optional)
Memory