Response id one (respid1), Register: 0x4b, Register: 0x4c – Avago Technologies LSI53C1000R User Manual
Page 195
SCSI Registers
4-83
Version 2.2
Copyright © 2000–2003 by LSI Logic Corporation. All rights reserved.
Register: 0x4B
Response ID One (RESPID1)
Read/Write
RESPID1
Response ID One
[7:0]
and RESPID1 contain the
selection or reselection IDs. These two 8-bit registers
contain the SCSI ID that the chip responds to on the
SCSI bus. Each bit represents one possible ID; the most
significant bit of RESPID1 represents ID 15, and the least
significant bit of RESPID0 represents ID 0. The SCID
register still contains the chip ID used during arbitration.
The chip can respond to more than one ID because more
than one bit can be set in the RESPID1 and RESPID0
registers. However, the chip can arbitrate with only one
ID value in the
register.
Register: 0x4C
SCSI Test Zero (STEST0)
Read Only
SSAID[3:0]
SCSI Selected As ID
[7:4]
These bits contain the encoded value of the SCSI ID that
the LSI53C1000R is selected or reselected as during a
SCSI Selection or Reselection phase. These bits are
read only and contain the encoded value of 16 possible
IDs that could select the LSI53C1000R. During a SCSI
Selection or Reselection phase when a valid ID is put on
the bus, and the LSI53C1000R responds to that ID, the
“selected as” ID is written into these bits. These bits are
used with
and
registers to allow response
to multiple IDs on the bus.
7
0
RESPID1
x
x
x
x
x
x
x
x
7
4
3
2
1
0
SSAID[3:0]
SLT
ART
SOZ
SOM
0
0
0
0
0
x
1
1