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DNC3X3125 Datasheet(PDF) 7 Page - Agere Systems |
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DNC3X3125 Datasheet(HTML) 7 Page - Agere Systems |
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7 / 32 page  Advance Data Sheet DNC3X3125 March 2000 10/100 Mbits/s Ethernet Transceiver Macrocell 7 4 Signal Information (continued) Table 2. MII Management Signals Table 3. 10/100 Mbits/s Twisted-Pair (TP) Interface Signals Signal Type Name/Description MDC I Management Data Clock. This is the timing reference for the transfer of data on the MDIO signal. This signal may be asynchronous to MRXCLK and MTXCLK. The maximum clock rate is 12.5 MHz. When running MDC above 6.25 MHz, MDC must be synchronous with CLK25RAW and have a setup time of 15 ns and a hold time of 5 ns with respect to CLK25RAW. MDIO_IN I Management Data Input. Control information is driven by the station manage- ment, synchronous with MDC, onto this input. MDIO_OUT O Management Data Output. Status information is driven by the DNC3X3125, synchronous with MDC, onto this output. MDIO_HI_Z O Management Data Output Enable. When high, this signal can be used to 3-state the MDIO bidirectional buffer (external to the DNC3X3125). INT_MASK I Interrupt Mask. When set high, no interrupt is generated under any condition. When set low, interrupts are generated according to bit [31.7]. This signal is ORed with bit [31.6]. INT_R31 O Maskable Status Interrupt. This signal will go high whenever there is a change in status as defined in Table 27. Signal Type Name/Description TPI PADI Received Data. Positive differential received 125 Mbaud MLT3 or 10 Mbaud Manchester data from magnetics. Fiber-Optic Data Input. Positive differential received 125 Mbaud pseudo-ECL data from fiber transceiver. TPIB PADI Received Data. Negative differential received 125 Mbaud MLT3 or 10 Mbaud Manchester data from magnetics. Fiber-Optic Data Input. Negative differential received 125 Mbaud pseudo-ECL data from fiber transceiver. TPO PADO Transmit Data. Positive differential transmit 125 Mbaud MLT3 or 10 Mbaud Manchester data to magnetics. Fiber-Optic Data Output. Positive differential transmit 125 Mbaud pseudo-ECL compatible data to fiber transceiver. TPOB PADO Transmit Data. Negative differential transmit 125 Mbaud MLT3 or 10 Mbaud Manchester data to magnetics. Fiber-Optic Data Output. Negative differential transmit 125 Mbaud pseudo- ECL compatible data to fiber transceiver. REXT10 PADO Current Setting 10 Mbits/s. An external resistor (21.0 k Ω) is placed from this signal to ground to set the 10 Mbits/s TP driver transmit output level. REXT100 PADO Current Setting 100 Mbits/s. An external resistor (21.5 k Ω) is placed from this signal to ground to set the 100 Mbits/s TP driver transmit output level. REXTBS PADO Band Gap Reference for the Receive Channel. Connect this signal to a 24.9 k Ω ± 1% resistor to ground. The parasitic load capacitance should be less than 15 pF. |
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