Scsi status one (sstat1), Register: 0x0e (0x8e) – LSI 53C810A User Manual
Page 98
5-24
Operating Registers
Register: 0x0E (0x8E)
SCSI Status One (SSTAT1)
Read Only
FF[3:0]
FIFO Flags
[7:4]
These four bits define the number of bytes that currently
reside in the LSI53C810A’s SCSI synchronous data
FIFO. These bits are not latched and they will change as
data moves through the FIFO. The FIFO can hold up to
9 bytes. Values over nine will not occur.
[
SDPL
Latched SCSI Parity
3
This bit reflects the SCSI parity signal (SDP/),
corresponding to the data latched in the
. It changes when a new byte is latched into
the
register. This bit is
active high, in other words, it is set when the parity signal
is active.
7
4
3
2
1
0
FF[3:0]
SDPL
MSG
C/D
I/O
0
0
0
0
x
x
x
x
FF3
FF2
FF1
FF0
Bytes or Words in
the SCSI FIFO
0
0
0
0
0
0
0
0
1
1
0
0
1
0
2
0
0
1
1
3
0
1
0
0
4
0
1
0
1
5
0
1
1
0
6
0
1
1
1
7
1
0
0
0
8
1
0
0
1
9