Register: 0x3c–0x3f – Avago Technologies LSI53C876E User Manual
Page 166
4-72
Registers
other than
, this register cannot
be accessed except by a SCRIPTS instruction during
SCRIPTS execution. For more information on the use of
this bit in interrupt handling, see
COM
LSI53C700 Family Compatibility
0
When the COM bit is cleared, the LSI53C876 SCSI
function behaves in a manner compatible with the
LSI53C700 family; selection/reselection IDs are stored in
both the
and
registers. This bit is not effected by a
software reset.
If the COM bit is cleared, do not access this register
using SCRIPTS operation as nondeterminate operations
may occur. (This includes SCRIPTS Read/Write
operations and conditional transfer control instructions
that initialize the
SCSI First Byte Received (SFBR)
register.)
When the COM bit is set, the ID is stored only in the
register, protecting the SFBR
from being overwritten if a selection/reselection occurs
during a DMA register-to-register operation.
Register: 0x3C–0x3F
Adder Sum Output (ADDER)
Read Only
ADDER
Adder Sum Output
[31:0]
This register contains the output of the internal adder,
and is used primarily for test purposes. The power-up
value for this register is indeterminate.
31
0
ADDER
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