Table A.2

LSI53C875A SCSI Register Map (Cont.)

 

 

 

 

 

 

Register Name

Address

Read/Write

Page

 

 

 

 

DMA Command (DCMD)

0x27

Read/Write

4-63

 

 

 

 

DMA Control (DCNTL)

0x3B

Read/Write

4-70

 

 

 

 

DMA FIFO (DFIFO)

0x20

Read/Write

4-57

 

 

 

 

DMA Interrupt Enable (DIEN)

0x39

Read/Write

4-69

 

 

 

 

DMA Mode (DMODE)

0x38

Read/Write

4-66

 

 

 

 

DMA Next Address (DNAD)

0x28–0x2B

Read/Write

4-64

 

 

 

 

DMA Next Address 64 (DNAD64)

0xB8–0xBB

Read/Write

4-103

 

 

 

 

DMA SCRIPTS Pointer (DSP)

0x2C–0x2F

Read/Write

4-64

 

 

 

 

DMA SCRIPTS Pointer Save (DSPS)

0x30–0x33

Read/Write

4-65

 

 

 

 

DMA Status (DSTAT)

0x0C

Read Only

4-39

 

 

 

 

DSA Relative Selector (DRS)

0xAC–0xAF

Read/Write

4-101

 

 

 

 

Dynamic Block Move Selector (DBMS)

0xB4–0xB7

Read/Write

4-103

 

 

 

 

Entry Storage Address (ESA)

0xD0–0xD3

Read/Write

4-106

 

 

 

 

General Purpose (GPREG0)

0x07

Read/Write

4-35

 

 

 

 

General Purpose Pin Control Zero (GPCNTL0)

0x47

Read/Write

4-82

 

 

 

 

Instruction Address (IA)

0xD4–0xD7

Read/Write

4-107

 

 

 

 

Interrupt Status One (ISTAT1)

0x15

Read/Write

4-51

 

 

 

 

Interrupt Status Zero (ISTAT0)

0x14

Read/Write

4-48

 

 

 

 

Mailbox One (MBOX1)

0x17

Read/Write

4-52

 

 

 

 

Mailbox Zero (MBOX0)

0x16

Read/Write

4-52

 

 

 

 

Memory Access Control (MACNTL)

0x46

Read/Write

4-81

 

 

 

 

Memory Move Read Selector (MMRS)

0xA0–0xA3

Read/Write

4-100

 

 

 

 

Memory Move Write Selector (MMWS)

0xA4–0xA7

Read/Write

4-100

 

 

 

 

Phase Mismatch Jump Address 1 (PMJAD1)

0xC0–0xC3

Read/Write

4-104

 

 

 

 

Phase Mismatch Jump Address 2 (PMJAD2)

0xC4–0xC7

Read/Write

4-104

 

 

 

 

 

Register Summary

A-3

Page 303
Image 303
LSI 53C875A technical manual Register Summary