SN75C091A Datasheet, PDF (100/106 Pages) Texas Instruments – SCSI Bus Controller

Appendix B
Register File Summary
Register # Register Name
Hex Address Access
Parity 7
6
5
4
3
2
1
0
0
Receive FIFO
00
R
0
Transmit FIFO
00
W
1
Command
01
R/W
DMA M/A DDIR CC4 CC3 CC2 CC1 CC0
2
Transfer Status
02
R
INT
RFE RFHF TFF TFHF TC0 OC0 CDACT
3
Bus Phase Status
03
R
INIT TARG
0
ATN MSG C/D
I/O SRST
4
Functional Interrupt Status
04
R
SEL BUS ATN
FC
DIS
0
RSL
AB-
END
5
Error Interrupt Status
05
R
PE
UMS SRST T-O
NVC
CNTL
NEW-
LN
HALT
6
Interrupt Enable
06
R/W
0
0
0
0
0
FCIE AIE
MIE
7
Unused
07
n/a
0
0
0
0
0
0
0
0
8
Control
08
R/W
SE
RE
HA
HPE AAPE
HD
HAAM
ATN-
DS
9
Byte Stack Control
DMD
0
0
09
R/W
0
WL1 WL0 BOF1 BOF0
10
Parity Control
0A
R/W
PMPE MPCE MPGE PPCE PPGE SPE SPCE SPGE
B–1