Dma command (dcmd), Next address (dnad), Dma next – Avago Technologies LSI8751D User Manual
Page 161: Address (dnad), Dma next address (dnad)
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Register: 0x27 (0xA7)
DMA Command (DCMD)
Read/Write
DCMD
DMA Command
[7:0]
This 8-bit register determines the instruction for the
LSI53C875 to execute. This register has a different
format for each instruction. For complete descriptions,
see
Chapter 6, “Instruction Set of the I/O Processor.”
Registers: 0x28–0x2B (0xA8–0xAB)
DMA Next Address (DNAD)
Read/Write
DNAD
DMA Next Address
[31:0]
This 32-bit register contains the general purpose address
pointer. At the start of some SCRIPTS operations, its
value is copied from the DSPS register. Its value may not
be valid except in certain abort conditions. The default
value of this register is zero.
Do not use this register to determine data addresses
during a Phase Mismatch interrupt, as its value is not
always correct for this use. Use the
, and
registers to calculate residual byte counts
and addresses as described in
in
Chapter 2, “Functional Description.”
7
0
DCMD
x
x
x
x
x
x
x
x
31
0
DNAD
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0