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LAN91C100FD Datasheet(PDF) 8 Page - SMSC Corporation |
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LAN91C100FD Datasheet(HTML) 8 Page - SMSC Corporation |
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8 / 68 page  SMSC DS – LAN91C100FD REV. B Page 8 Rev. 05/31/2000 DESCRIPTION OF PIN FUNCTIONS PQFP/TQFP PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 202 Loopback LBK O4 Output. Active when LOOP bit is set (TCR bit 1). Independent of port selection (MIISEL=X). 1 nLink Status nLNK I with pullup Input. General purpose input port used to convey LINK status (EPHSR bit 14). Independent of port selection (MIISEL=X). 195 nFullstep nFSTEP O4 Output. Non volatile output pin. Driven by inverse of FULLSTEP (CONFIG bit 10). Independent of port selection (MIISEL=X). 6 MII Select MIISEL O4 Output. Non volatile output pin. Driven by MII SELECT (CONFIG bit 15). High indicates the MII port is selected, low indicates the 10 Mbps ENDEC is selected. 194 AUI Select AUISEL O4 Output. Non volatile output pin. Driven by AUI SELECT (CONFIG bit 8). Independent of port selection (MIISEL= X). 30 Transmit Enable 100 Mbps TXEN100 O12 Output to MII PHY. Envelope to 100 Mbps transmission. This pin stays low if MIISEL is low. 19 Carrier Sense 100 Mbps CRS100 I with pulldown Input from MII PHY. Envelope of packet reception used for deferral and backoff purposes. This pin is ignored when MIISEL is low. 12 Receive Data Valid RX_DV I with pulldown Input from MII PHY. Envelope of data valid reception. Used for receive data framing. This pin is ignored when MIISEL is low. 18 Collision Detect 100 Mbps COL100 I with pulldown Input from MII PHY. Collision detection input. This pin is ignored when MIISEL is low. 25, 26, 28, 29 Transmit Data TXD0- TXD3 O12 Outputs. Transmit Data nibble to MII PHY. 9 Transmit Clock TX25 I with pullup Input. Transmit clock input from MII. Nibble rate clock (25 MHz). This pin is ignored when MIISEL is low. 17 Receive Clock RX25 I with pullup Input. Receive clock input from MII PHY. Nibble rate clock. This pin is ignored when MIISEL is low. 20, 21, 22, 24 Receive Data RXD0- RXD3 I Inputs. Received Data nibble from MII PHY. These pins are ignored when MIISEL is low. 198 Manage- ment Data Input MDI I with pulldown MII management data input. 196 Manage- ment Data Output MDO O4 MII management data output. 192 Manage- ment Clock MCLK O4 MII management clock. 11 Receive Error RX_ER I with pulldown Input. Indicates a code error detected by PHY. Used by the LAN91C100FD to discard the packet being received. The error indication reported for this event is the same as a bad CRC (Receive Status Word bit 13). This pin is ignored when MIISEL is low. |
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Similar Description - LAN91C100FD |
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