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Register Summary
A-6
SYM53C810A Data Manual
Register 3A (BA)
Scratch Byte Register (SBR)
Read/Write
Register 3B (BB)
DMA Control (DCNT L)
Read/Write
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
CLSE (Cache Line Size E nable)
PFF (Pre-Fetch Flush)
PFE N (Pre-fetch E nable)
SSM (Single-step mode)
IRQM (IRQ Mode)
ST D (Start DMA operation)
IRQD (IRQ Disable)
COM (53C700 compatibility)
Register 3C-3F (BC-BF)
Adder Sum Output (ADDER)
Read Only
Register 40 (C0)
SCSI Interrupt Enable Zero (SIEN0)
Read/Write
Bit 7
M/A (SCSI Phase Mismatch -
Initiator Mode; SCSI AT N
Condition - Target Mode)
CMP (Function Complete)
SE L (Selected)
RSL (Reselected)
SGE (SCSI Gross E rror)
UDC (Unexpected Disconnect)
RST (SCSI Reset Condition)
PAR (SCSI Parity E rror)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Register 41 (C1)
SCSI Interrupt Enable One (SIEN1)
Read/Write
Bits 7-3
Bit 2
Bit 1
Bit 0
Reserved
ST O (Selection or Reselection T ime-out)
GE N (General Purpose T imer E xpired)
HT H (Handshake to Handshake timer E xpired)
Register 42 (C2)
SCSI Interrupt Status Zero (SIST 0)
Read Only
Bit 7
M/A (Initiator Mode: Phase Mismatch; Target
Mode: SAT N/ Active)
CMP (Function Complete)
SE L (Selected)
RSL (Reselected)
SGE (SCSI Gross E rror)
UDC (Unexpected Disconnect)
RST (SCSI RST / Received)
PAR (Parity E rror)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Register 43 (C3)
SCSI Interrupt Status One (SIST 1)
Read Only
Bits 7-3
Bit 2
Bit 1
Bit 0
Reserved
ST O (Selection or Reselection T ime-out)
GE N (General Purpose T imer E xpired)
HT H (Handshake-to-Handshake T imer E xpired)
Register 44 (C4)
SCSI Longitudinal Parity (SLPAR)
Read/Write
CLSE
7
PFF
6
PFEN
5
SSM
4
IRQM
3
STD
2
IRQD
1
COM
0
Default>>>
0
0
0
0
0
0
0
0
M/A
7
CMP
6
SEL
5
RSL
4
SGE
3
UDC
2
RST
1
PAR
0
Default>>>
0
0
0
0
0
0
0
0
RES
7
RES
6
RES
5
RES
4
RES
3
STO
2
GEN
1
HTH
0
Default>>>
X
X
X
X
X
0
0
0
M/A
7
CMP
6
SEL
5
RSL
4
SGE
3
UDC
2
RST
1
PAR
0
Default>>>
0
0
0
0
0
0
0
0
RES
7
RES
6
RES
5
RES
4
RES
3
STO
2
GEN
1
HTH
0
Default>>>
X
X
X
X
X
0
0
0