No Operation - Adaptec AHA-1740A Technical Reference Manual

EISA-to-Fast SCSI Host Adapter

No Operation

F E D
0 Options
Fields that are empty are reserved and should be set to zero.
If the SCSI ID specified in the Attention register specifies the SCSI address of the
host adapter, then this command is intended for diagnostic purposes to test whether
the transfer of control blocks and their associated interrupts are working properly. It
can also be used to test whether control block chaining is working properly. The Logi-
cal Unit Number (Flag Word 2, bits 2-0) is ignored.
C B A 9 8
0 0 0 0
Flag Word 1
Flag Word 2
Status Block Pointer
Chain Address
Enhanced Mode Firmware Description
7 6 5 4 3
0 0 0 0 0
2 1 0 Byte
Offset
0 0 0 00
02
04
06
08
0A
0C
0E
10
12
14
16
18
1A
1C
1E
20
22
24
26
28
2A
2C
2E
6-27