Dma scripts, Pointer (dsp), Dma scripts pointer save – Avago Technologies LSI53C825AE User Manual
Page 152: Dsps), Pointer save (dsps)
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Registers
Registers: 0x2C–0x2F (0xAC–0xAF)
DMA SCRIPTS Pointer (DSP)
Read/Write
DSP
DMA SCRIPTS Pointer
[31:0]
To execute SCSI SCRIPTS, the address of the first
SCRIPTS instruction must be written to this register. In
normal SCRIPTS operation, once the starting address of
the SCRIPT is written to this register, SCRIPTS are
automatically fetched and executed until an interrupt
condition occurs.
In the single step mode, there is a single step interrupt
after each instruction is executed. The
register does not need to be written with
the next address, but the Start DMA bit (bit 2,
register) must be set each time the step
interrupt occurs to fetch and execute the next SCRIPTS
command. When writing this register eight bits at a time,
writing the upper eight bits begins execution of SCSI
SCRIPTS. The default value of this register is zero.
Registers: 0x30–0x33 (0xB0–0xB3)
DMA SCRIPTS Pointer Save (DSPS)
Read/Write
DSPS
DMA SCRIPTS Pointer Save
[31:0]
This register contains the second Dword of a SCRIPTS
instruction. It is overwritten each time a SCRIPTS
instruction is fetched. When a SCRIPTS interrupt
instruction is executed, this register holds the interrupt
vector. The power-up value of this register is
indeterminate.
31
0
DSP
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
31
0
DSPS
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x