am79c974 Advanced Micro Devices, am79c974 Datasheet - Page 117

• Manufacturer Part Number: am79c974
• Description: Pcnettm-scsi Combination Ethernet And Scsi Controller For Pci Systems
• Manufacturer: Advanced Micro Devices

SCSI Controller
SCSI Register Map
DMA Register Map
CNTLREG1
CNTLREG2
CNTLREG3
CNTLREG4
SOFREG1
STATREG
CLKFREG
SDIDREG
STIMREG
Acronym
CMDREG
INSTREG
CFISREG
Acronym
CTCREG
CTCREG
CTCREG
STCREG
STCREG
STPREG
STCREG
Register
Register
STATUS
SMDLA
FFREG
WMAC
ISREG
WBC
WAC
CMD
RES
RES
STC
SPA
Address (Hex.)
Address (Hex.)
(B)+0C
(B)+1C
(B)+1C
(B)+2C
(B)+3C
(B)+4C
(B)+5C
(B)+00
(B)+00
(B)+04
(B)+04
(B)+08
(B)+10
(B)+10
(B)+14
(B)+14
(B)+18
(B)+18
(B)+20
(B)+24
(B)+28
(B)+30
(B)+34
(B)+38
(B)+38
(B)+40
(B)+44
(B)+48
(B)+50
(B)+54
(B)+58
Register Description
Current Transfer Count Register Low
Start Transfer Count Register Low
Current Transfer Count Register Middle
Start Transfer Count Register Middle
SCSI FIFO Register
SCSI Command Register
SCSI Status Register
SCSI Destination ID Register
Interrupt Status Register
SCSI Timeout Register
Internal State Register
Synchronous Transfer Period Register
Current FIFO/Internal State Register
Synchronous Offset Register
Control Register One
Clock Factor Register
Reserved
Control Register Two
Control Register Three
Control Register Four
Current Transfer Count Register High/Part-Unique ID Code
Start Current Transfer Count Register High
Reserved
Register Description
Command
Starting Transfer Count
Starting Physical Address
Working Byte Counter
Working Address Counter
Status Register
Starting Memory Descriptor List (MDL) Address
Working MDL Counter
P R E L I M I N A R Y
Am79C974
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
AMD
Read
Read
Read
Read
Read
Read
Read
Type
Write
Write
Write
Write
Write
Write
Write
Write
Write
Write
Type
R/W
R/W
R/W
R/W
R
R
R
R
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