Scratch register b (scratchb) – Avago Technologies LSI53C825AE User Manual
Page 183
Operating Registers
4-95
Registers: 0x5C–0x5F (0xDC–0xDF)
Scratch Register B (SCRATCHB)
Read/Write
SCRATCHB
Scratch Register B
[31:0]
This is a general purpose user definable scratch pad
register. Apart from CPU access, only register read/write
and memory moves directed at the SCRATCH register
alter its contents. The LSI53C825A cannot fetch
SCRIPTS instructions from this location. When bit 3 in
the
register is set, this register
contains the base address for the 4 Kbyte internal RAM.
Setting
bit 3 only causes the
base address to appear in the
register; any information that was
previously in the register remains intact. Any writes to this
register while the bit is set passes through the actual
register. The power-up
values are indeterminate.
Registers: 0x60–0x7F (0xE0–0xFF)
Scratch Registers C–J (SCRATCHC–SCRATCHJ)
Read/Write
These registers are general purpose scratch registers for user defined
functions. The LSI53C825A cannot fetch SCRIPTS instructions from this
location. The power-up value of these registers is indeterminate.
31
0
SCRATCHB
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
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x