Avago Technologies LSI53C1010 - Manual (Page 55)

Instruction Descriptions 3-15
Field(s) This command has the following fields:
Description The chip deasserts the signals indicated in the instruction. Currently four
bits are defined, clearing the SCSI SACK, target role, and SATN bits as
well as the CARRY bit in the ALU. Bit 10 is for CARRY, bit 9 is for target,
bit 6 is for Acknowledge, and bit 3 is for Attention.
Legal Forms CLEAR ACK
CLEAR ATN
CLEAR TARGET
CLEAR CARRY
CLEAR ACK and ATN
CLEAR ACK and TARGET
CLEAR ACK and CARRY
Figure 3.4 CLEAR Format
31 30 29 27 26 24 23 11 10 9 8 7 6 5 4 3 2 0
DCMD Register DBC Register
Instr
Type
Opcode R R
Set/
Clear
Carry
Set/
Clear
Target
R
Assert
SCSI
ACK
R
Assert
SCSI
ATN
R
0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 x x 0 0 x 0 0 x 0 0 0
31 0
DSPS Register
R
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
Instruction Type I/O.
Opcode Clear instruction.
Set/Clear
Carry 1 - clears the Carry bit in the ALU
0 - has no effect
Set/Clear
Target Mode 1 - places the chip into initiator mode
0 - has no effect
Set/Clear
SCSI ACK 1 - deasserts the SCSI acknowledge signal
0 - has no effect
Set/Clear
SCSI ATN 1 - deasserts the SCSI attention signal
0 - has no effect