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DP83256VF Datasheet(PDF) 82 Page - National Semiconductor (TI) |
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DP83256VF Datasheet(HTML) 82 Page - National Semiconductor (TI) |
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82 / 144 page  50 Registers (Continued) 538 TRIGGER DEFINITION REGISTER (TDR) This register determines which events cause a trigger transition and which transmit mode is entered when a trigger transition is detected The trigger transmit modes are the same as those found in the Current Transmit State Register (CTSR) and are loaded from the TDR into the CTSR when any of the selected trigger conditions occur When a trigger condition occurs CMTCRTCO is set The Trigger Definition Register is useful to implement the strict PC React time requirement ACCESS RULES ADDRESS READ WRITE 26h Always Always D7 D6 D5 D4 D3 D2 D1 D0 TONT TOQLS TOHLS TOMLS TOSILS TTM2 TTM1 TTM0 Bit Symbol Description D0 TTM0 TRIGGER TRANSMIT MODE k0 1 2l These bits select one of 6 transmission modes to be loaded into the Current Transmit State Register (CTSR) when a trigger condition is detected The trigger condition is selected by D1 TTM1 the upper 5 bits of this register D2 TTM2 TTM2 TTM1 TTM0 000 Active Transmit Mode (ATM) Normal transmission of incoming PHY Request data 001 Idle Transmit Mode (ITM) Transmission of Idle symbol pairs (11111 11111) 010 Off Transmit Mode (OTM) Transmission of Quiet symbol pairs (00000 00000) and deassertion of the PMD transmitter Enable pin (TXE) 011 Reserved Reserved for future use Users are discouraged from using this transmit mode If selected however the transmitter will generate Quiet symbol pairs (00000 00000) 100 Master Transmit Mode (MTM) Transmission of Halt and Quiet symbol pairs (00100 00000) 101 Halt Transmit Mode (HTM) Transmission of Halt symbol pairs (00100 00100) 110 Quiet Transmit Mode (QTM) Transmission of Quiet symbol pairs (00000 00000) 111 Reserved Reserved for future use Users are discouraged from using this transmit mode If selected however the transmitter will generate Quiet symbol pairs (00000 00000) D3 TOSILS TRIGGER ON SILS Trigger when SILS is received D4 TOMLS TRIGGER ON MLS Trigger when MLS is received D5 TOHLS TRIGGER ON HLS Trigger when HLS is received D6 TOQLS TRIGGER ON QLS (or NSD) Trigger when QLS is received D7 TONT TRIGGER ON Noise Threshold Trigger when Noise Threshold is reached (Current Noise Registere0) 82 |
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