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LAN91C100FD Datasheet(PDF) 9 Page - SMSC Corporation |
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LAN91C100FD Datasheet(HTML) 9 Page - SMSC Corporation |
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9 / 77 page  FEAST Fast Ethernet Controller with Full Duplex Capability SMSC LAN91C100FD Rev. D Page 9 Revision 1.0 (09-22-08) DATASHEET PQFP/TQFP PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 42, 40-38, 36-33 RAM Data Bus RD0-RD7 I/O4 with pullups Bidirectional. Carries the local buffer memory read and write data. Reads are always 32 bits wide. Writes are controlled individually at the byte level. Floated if FLTST=1 during RECEIVE FRAME STATUS WORD writes for packet forwarding information (RA2-RA16=0, RCVDMA=1, nRWE0-nRWE3=0). 59, 56, 49-47, 45-43, 69-67, 65, 64, 62-60, 81-76, 71, 70 RAM Data Bus RD8- RD31 I/O4 with pullups Bidirectional. Carries the local buffer memory read and write data. Reads are always 32 bits wide. Writes are controlled individually at the byte level. 84, 87, 88, 90, 91, 96, 99, 101, 100, 98, 89, 92, 103, 102, 104 RAM Address Bus RA2-RA16 O4 Outputs. This bus specifies the buffer RAM doubleword being accessed by the LAN91C100FD. 97 nROE O4 Output. Active low signal used to read a doubleword from buffer RAM. 31, 57, 73, 86 nRWE0- RWE3 O4 Outputs. Active low signals used to write any byte, word or dword in RAM. 93 Receive DMA RCVDMA O4 Output. This pin is active during LAN91C100FD write memory cycles of receive packets. 3 4 Crystal 1 Crystal 2 XTAL1 XTAL2 Iclk An external 25 MHz crystal is connected across these pins. If a TTL clock is supplied instead, it should be connected to XTAL1 and XTAL2 should be left open. 5, 10, 23, 27, 41, 63, 74, 83, 85, 107, 119, 125, 132, 143, 165, 179, 186, 191 Power VDD +5V power supply pins. 205 Analog Power AVDD +5V analog power supply pins. 14, 32, 46, 50, 66, 75, 82, 94, 111, 116, 120, 122, 128, 134, 138, 169, 174, 180, 185, 200 Ground GND Ground pins. 203 Analog Ground AGND Analog ground pin. 2 Transmit Enable TXEN O4 Output. Used for 10 Mbps ENDEC. This pin stays low when MIISEL is high. |
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