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A-4 Register Summary
Remaining Byte Count (RBC) 0xC8–0xCB Read/Write 4-105
Reserved 0x53 – 4-94
Reserved 0x5A–0x5B – 4-99
Reserved 0xBC–0xBF – 4-103
Reserved 0xDB – 4-108
Reserved 0xE0–0xFF – 4-108
Response ID One (RESPID1) 0x4B Read/Write 4-86
Response ID Zero (RESPID0) 0x4A Read/Write 4-86
Scratch Byte Register (SBR) 0x3A Read/Write 4-70
Scratch Register A (SCRATCHA) 0x34–0x37 Read/Write 4-65
Scratch Register B (SCRATCHB) 0x5C–0x5F Read/Write 4-99
Scratch Registers C–R (SCRATCHC–SCRATCHR) 0x60–0x9F Read/Write 4-99
SCRIPTS Fetch Selector (SFS) 0xA8–0xAB Read/Write 4-101
SCSI Bus Control Lines (SBCL) 0x0B Read Only 4-38
SCSI Bus Data Lines (SBDL) 0x58–0x59 Read Only 4-98
SCSI Byte Count (SBC) 0xD8–0xDA Read Only 4-107
SCSI Chip ID (SCID) 0x04 Read/Write 4-30
SCSI Control One (SCNTL1) 0x01 Read/Write 4-23
SCSI Control Three (SCNTL3) 0x03 Read/Write 4-28
SCSI Control Two (SCNTL2) 0x02 Read/Write 4-26
SCSI Control Zero (SCNTL0) 0x00 Read/Write 4-20
SCSI Destination ID (SDID) 0x06 Read/Write 4-35
SCSI First Byte Received (SFBR) 0x08 Read/Write 4-36
SCSI Input Data Latch (SIDL) 0x50–0x51 Read Only 4-93
SCSI Interrupt Enable One (SIEN1) 0x41 Read/Write 4-75
Table A.2 LSI53C875A SCSI Register Map (Cont.)
Register Name Address Read/Write Page