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AM79C940 Datasheet(PDF) 76 Page - Advanced Micro Devices |
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AM79C940 Datasheet(HTML) 76 Page - Advanced Micro Devices |
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76 / 122 page  AMD 76 Am79C940 Programmer’s Register Model Addr Mnemonic Contents R/W 0 RCVFIFO Receive FIFO—16 bits RO 1 XMTFIFO Transmit FIFO—16 bits WO 2 XMTFC Transmit Frame Control 80 DRTRY Disable Retry 08 DXMTFCS Disable Transmit FCS 01 APADXMT Auto Pad Transmit 3 XMTFS Transmit Frame Status RO 80 XMTSV Transmit Status Valid 40 UFLO Underflow 20 LCOL Late Collision 10 MORE MORE than one retry was needed 08 ONE Exactly ONE retry occurred 04 DEFER Transmission was deferred 02 LCAR Loss of Carrier 01 RTRY Transmit aborted after 16 attempts 4 XMTRC 80 EXDEF Excessive Defer RO 40 — 20 — 10 — 0F XMTRC [3:0] 4-bit Transmit Retry Count 5 RCVFC Receive Frame Control 08 LLRCV Low Latency Receive 04 M/ R Match/ Reject for external address detection 01 ASTRPRCV Auto Strip Receive—Strips pad and FCS from received frames 6 RCVFS Receive Frame Status—4 bytes—read in 4 read cycles RO RFS0 RCVCNT [7:0] Receive Message Byte Count RFS1 RCVSTS, RCVCNT [11:8]—Receive Status & Receive Msg Byte Count MSBs 80 OFLO Receive FIFO Overflow 40 CLSN Collision during reception 20 FRAM Framing Error 10 FCS FCS (CRC) error 0F RCVCNT [11:8] 4 MSBs of Receive Msg. Byte Count RFS2 RNTPC [7:0] Runt Packet Count (since last successful reception) RFS3 RCVCC [7:0] Receive Collision Count (since last successful reception) 7 FIFOFC FIFO Frame Count RO F0 RCVFC Receive Frame Count—# of RCV frames in FIFO 0F XMTFC Transmit Frame Count—# of XMT frames in FIFO RO 8 IR Interrupt Register RO 80 JAB Jabber Error—Excessive transmit duration (20–150ms) 40 BABL Babble Error →1518 bytes transmitted 20 CERR Collision Error—No SQE Test Message 10 RCVCCO Receive Collision Count Overflow—Reg Addr 27 overflow 08 RNTPCO Runt Packet Count Overflow—Reg Addr 26 overflow 04 MPCO Missed Packet Count Overflow—Reg Addr 24 overflow 02 RCVINT Receive Interrupt—Host has read last byte of packet 01 XMTINT Transmit Interrupt—Transmission is complete R/W R/W |
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