Table 4.6 scsi synchronous data fifo word count, Scsi synchronous data fifo word count, Scsi status one (sstat1) – Avago Technologies LSI53C896 User Manual
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4-46
Registers
Version 3.3
Copyright © 1998–2003 by LSI Logic Corporation. All rights reserved.
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SCSI Status One (SSTAT1)
Read Only
FF[3:0]
FIFO Flags
[7:4]
These four bits, along with
bit 4, define the number of bytes or words that currently
reside in the LSI53C896’s SCSI synchronous data FIFO
as shown in
. These bits are not latched and
they change as data moves through the FIFO.
7
4
3
2
1
0
FF[3:0]
SDP0L
MSG
C_D
I/O
0
0
0
0
x
x
x
x
Table 4.6
SCSI Synchronous Data FIFO Word Count
FF4
(SSTAT2 Bit 4)
FF3
FF2
FF1
FF0
Bytes or
Words in the
SCSI FIFO
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
1
0
2
0
0
0
1
1
3
0
0
1
0
0
4
0
0
1
0
1
5
0
0
1
1
0
6
0
0
1
1
1
7
0
1
0
0
0
8
0
1
0
0
1
9
0
1
0
1
0
10
0
1
0
1
1
11
0
1
1
0
0
12
0
1
1
0
1
13
0
1
1
1
0
14
0
1
1
1
1
15
1
0
0
0
0
16
1
0
0
0
1
17
1
0
0
1
0
18
1
0
0
1
1
19
1
0
1
0
0
20
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