Avago Technologies LSI53C896 User Manual
Page 159
SCSI Registers
4-47
Version 3.3
Copyright © 1998–2003 by LSI Logic Corporation. All rights reserved.
SDP0L
Latched SCSI Parity
3
This bit reflects the SCSI parity signal (SDP0/),
corresponding to the data latched in the
. It changes when a new
byte is latched into the least significant byte of the SIDL
register. This bit is active HIGH, in other words, it is set
when the parity signal is active.
MSG
SCSI MSG/ Signal
2
C_D
SCSI C_D/ Signal
1
I/O
SCSI I_O/ Signal
0
These SCSI phase status bits are latched on the
asserting edge of SREQ/ when operating in either the
initiator or target mode. These bits are set when the
corresponding signal is active. They are useful when
operating in the low level mode.
1
0
1
0
1
21
1
0
1
1
0
22
1
0
1
1
1
23
1
1
0
0
0
24
1
1
0
0
1
25
1
1
0
1
0
26
1
1
0
1
1
27
1
1
1
0
0
28
1
1
1
0
1
29
1
1
1
1
0
30
1
1
1
1
1
31
Table 4.6
SCSI Synchronous Data FIFO Word Count
FF4
(SSTAT2 Bit 4)
FF3
FF2
FF1
FF0
Bytes or
Words in the
SCSI FIFO