Avago Technologies LSI53C825AE - Manual (Page 51)

PCI Cache Mode 2-27
Figure 2.2 LSI53C825A Host Interface Data Paths
2.4.9 SCSI Bus Interface
The LSI53C825A supports both SE and differential operation.
All SCSI signals are active LOW. The LSI53C825A contains the SE
output drivers and can be connected directly to the SCSI bus. Each
output is isolated from the power supply to ensure that a powered-down
LSI53C825A has no effect on an active SCSI bus (CMOS “voltage
feed-through” phenomena). TolerANT technology provides signal filtering
at the inputs of SREQ/ and SACK/ to increase immunity to signal
reflections.
PCI Interface PCI Interface PCI Interface PCI Interface
DMA FIFO
(32 Bits x 16)
DMA FIFO
(32 Bits x 16)
DMA FIFO
(32 Bits x 16)
DMA FIFO
(32 Bits x 16)
SODL Register SIDL Register SODL Register
SCSI FIFO
(8 or 16 Bits x 16)
SCSI Interface SCSI Interface SODR Register SCSI Interface
SCSI Interface
Asynchronous
SCSI Send
Asynchronous
SCSI Receive
Synchronous
SCSI Send
Synchronous
SCSI Receive
SWIDE Register SWIDE Register