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AM79C974 Datasheet(PDF) 117 Page - Advanced Micro Devices |
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AM79C974 Datasheet(HTML) 117 Page - Advanced Micro Devices |
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117 / 153 page  AMD P R E L I M I N A R Y 117 Am79C974 SCSI Controller SCSI Register Map Register Acronym Address (Hex.) Register Description Type CTCREG (B)+00 Current Transfer Count Register Low Read STCREG (B)+00 Start Transfer Count Register Low Write CTCREG (B)+04 Current Transfer Count Register Middle Read STCREG (B)+04 Start Transfer Count Register Middle Write FFREG (B)+08 SCSI FIFO Register Read/Write CMDREG (B)+0C SCSI Command Register Read/Write STATREG (B)+10 SCSI Status Register Read SDIDREG (B)+10 SCSI Destination ID Register Write INSTREG (B)+14 Interrupt Status Register Read STIMREG (B)+14 SCSI Timeout Register Write ISREG (B)+18 Internal State Register Read STPREG (B)+18 Synchronous Transfer Period Register Write CFISREG (B)+1C Current FIFO/Internal State Register Read SOFREG1 (B)+1C Synchronous Offset Register Write CNTLREG1 (B)+20 Control Register One Read/Write CLKFREG (B)+24 Clock Factor Register Write RES (B)+28 Reserved Write CNTLREG2 (B)+2C Control Register Two Read/Write CNTLREG3 (B)+30 Control Register Three Read/Write CNTLREG4 (B)+34 Control Register Four Read/Write CTCREG (B)+38 Current Transfer Count Register High/Part-Unique ID Code Read STCREG (B)+38 Start Current Transfer Count Register High Write RES (B)+3C Reserved Write DMA Register Map Register Acronym Address (Hex.) Register Description Type CMD (B)+40 Command R/W STC (B)+44 Starting Transfer Count R/W SPA (B)+48 Starting Physical Address R/W WBC (B)+4C Working Byte Counter R WAC (B)+50 Working Address Counter R STATUS (B)+54 Status Register R SMDLA (B)+58 Starting Memory Descriptor List (MDL) Address R/W WMAC (B)+5C Working MDL Counter R |
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