LSI 53C810A User Manual
Page 161
I/O Instruction
6-21
Table Relative
Treats the alternate jump address as a relative jump and
fetches the device ID, synchronous offset, and
synchronous period indirectly. The value in bits [23:0] of
the first four bytes of the SCRIPTS instruction is added
to the data structure base address to form the fetch
address.
Sel
Select with ATN/
24
This bit specifies whether SATN/ is asserted during the
selection phase when the LSI53C810A is executing a
Select instruction. When operating in Initiator mode, set
this bit for the Select instruction. If this bit is set on any
other I/O instruction, an illegal instruction interrupt is
generated.
ENDID
Encoded SCSI Destination ID
[18:16]
This 3-bit field specifies the destination SCSI ID for an I/O
instruction.
CC
Set/Clear Carry
10
This bit is used in conjunction with a Set or Clear
instruction to set or clear the Carry bit. Setting this bit
with a Set instruction asserts the Carry bit in the ALU.
Setting this bit with a Clear instruction deasserts the
Carry bit in the ALU.
TM
Set/Clear Target Mode
9
This bit is used in conjunction with a Set or Clear
instruction to set or clear Target mode. Setting this bit
with a Set instruction configures the LSI53C810A as a
target device (this sets bit 0 of the
register). Clearing this bit with a Clear
instruction configures the LSI53C810A as an Initiator
device (this clears bit 0 of the
register).
Command
Table Offset
Absolute Jump Offset