Avago Technologies LSI53C1010R User Manual

Page 270

5-22

SCSI SCRIPTS Instruction Set

Version 2.2

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/

This bit specifies whether SATN/ is asserted during the
selection phase when the LSI53C1010R is executing a
Select instruction. When operating in the 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.

Reserved

[23:20]

ENDID[3:0]

Encoded SCSI Destination ID

[19:16]

This 4-bit field specifies the destination SCSI ID for an I/O
instruction.

Reserved

[15:11]

Set/Clear Carry

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.
Clearing this bit with a Clear instruction deasserts the
Carry bit in the ALU.

Set/Clear Target Mode

This bit is used in conjunction with a Set or Clear
instruction to set or clear the target mode. Setting this bit
with a Set instruction configures the LSI53C1010R as a
target device (this sets bit 0 of the

Command

Not Used

Absolute Jump Offset

Command

Table Offset

Absolute Jump Offset