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2-28 Functional Description
Figure 2.3 DMA FIFO Sections
The LSI53C875A automatically supports misaligned DMA transfers. A
944-byte FIFO allows the LSI53C875A to support 2, 4, 8, 16, 32, 64, or
128 Dword bursts across the PCI bus interface.
2.2.12.1 Data Paths
The data path through the LSI53C875A 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 2.4 shows how data is moved to/from the SCSI bus in each of the
different modes.
118
Transfers
Deep
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8 Bytes Wide
8Bits
Byte Lane 7
8Bits
Byte Lane 6
8Bits
Byte Lane 5
8Bits
Byte Lane 4
8Bits
Byte Lane 3
8Bits
Byte Lane 2
8Bits
Byte Lane 1
8Bits
Byte Lane 0