LSI53CF92A LSI, LSI53CF92A Datasheet - Page 62

• Manufacturer Part Number: LSI53CF92A
• Manufacturer: LSI

Specifications of LSI53CF92A

• Lead Free Status / RoHS Status: Not Compliant

4-12
MSG, C/D, I/O
Registers
Copyright © 1995–2002 by LSI Logic Corporation. All rights reserved.
VOC
Valid Group Code
When the FSC is selected, this bit decodes the group code
field in the first byte of the Command Descriptor Block
(CDB). If the group code matches one defined in ANSI
X3.131-1986, this bit is set. An undefined group code
(designated reserved by the ANSI committee) leaves it not
set. If the SCSI-2 bit is set in the
register, Group 2 commands are recognized as ten-byte
commands and this bit is set. If the SCSI-2 bit is cleared,
Group 2 commands are treated as reserved commands.
Groups 3 and 4 are always treated as reserved commands.
A reserved group command causes the FSC to request six
command bytes and does not set this bit. Group 5
commands are recognized as twelve-byte commands and
this bit is set. The FSC recognizes Group 6 as six-byte
vendor unique commands and Group 7 as ten-byte vendor
unique commands. The Valid Group Code bit is cleared by
reading the
asserted. It is also cleared by a hardware reset or the
Reset Chip command, but not by a SCSI reset.
Phase Bits
These bits indicate the phase on the SCSI bus. They may
be latched or unlatched, depending on
(Config
When not latched, they indicate the phase at the time the
Status register was read. In keeping with the ANSI
definition of the phase signals, these bits must be stable
during any Status register read that follows an interrupt
generated by the FSC.
The phase bits may be latched to permit stacking FSC
commands. When the latch is enabled, the SCSI phase
is latched upon command completion. These values are
2), bit 6.
Interrupt
register if the interrupt output is
Configuration 2 (Config 2)
Configuration 2
[2:0]
3