LSI53C825AJ LSI, LSI53C825AJ Datasheet - Page 202

• Manufacturer Part Number: LSI53C825AJ
• Manufacturer: LSI

Specifications of LSI53C825AJ

• Lead Free Status / RoHS Status: Not Compliant

5-18
SCSI SCRIPTS Instruction Set
1. The LSI53C825A arbitrates for the SCSI bus by
2. If the LSI53C825A wins arbitration, it attempts to
3. If the LSI53C825A is selected or reselected before
4. If the Select with SATN/ field is set, the SATN/ signal
Initiator Mode
0
0
0
0
1
Select Instruction
Wait Disconnect Instruction
The LSI53C825A waits for the Target to perform a “legal”
disconnect from the SCSI bus. A “legal” disconnect
occurs when SBSY/ and SSEL/ are inactive for a
OPC2
asserting the SCSI ID stored in the
(SCID)
during the next available arbitration cycle without
reporting any lost arbitration status.
select the SCSI device whose ID is defined in the
destination ID field of the instruction. Once the
LSI53C825A wins arbitration, it fetches the next
instruction from the address pointed to by the
SCRIPTS Pointer (DSP)
SCRIPTS can move to the next instruction before the
selection completes. It continues executing SCRIPTS
until a SCRIPT that requires a response from the
Target is encountered.
winning arbitration, it fetches the next instruction from
the address pointed to by the 32-bit jump address
field stored in the
Manually set the LSI53C825A to Initiator mode if it is
reselected, or to Target mode if it is selected.
is asserted during the selection phase.
OPC1
0
0
1
1
0
register. If it loses arbitration, it tries again
OPC0
0
1
0
1
0
DMA Next Address (DNAD)
Instruction Defined
Select
Wait Disconnect
Wait Reselect
Set
Clear
register. This way the
SCSI Chip ID
register.
DMA