Avago Technologies LSI8751D - Manual (Page 40)

2-16 Functional Description
2.5.8.1 Data Paths
The data path through the LSI53C875 is dependent on whether data is
being moved into or out of the chip, and whether SCSI data is being
transferred asynchronously or synchronously.
Figure 2.2 shows how data is moved to/from the SCSI bus in each of the
different modes.
Figure 2.2 LSI53C875 Host Interface Data Paths
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