Table 1 - LAN91C100 Pin Requirements
PIN SYMBOLS
FUNCTION
System Address Bus
System Data Bus
NUMBER OF PINS
A1-A15, AEN, nBE0-nBE3
D0-D31
20
32
17
System Control Bus
RESET, nADS, LCLK, ARDY, nRDYRTN,
nSRDY, INT0-INT3, nLDEV, nRD, nWR,
nDATACS, nCYCLE, W/nR, nVLBUS
Serial EEPROM
EEDI, EEDO, EECS, EESK, ENEEP,
IOS0-IOS2
8
RAM Data Bus
RAM Address Bus
RAM Control Bus
Crystal Oscillator
Power
RD0-RD31
32
15
6
RA2-RA16
nROE, nRWE0-nRWE3, RCVDMA
XTAL1, XTAL2
VDD, AVDD
2
19
21
12
Ground
GND, AGND
External ENDEC 10 Mbps
TXEN, TXD, CRS, COL, RXD, TXC, RXC,
LBK, nLNK, nFSTEP, AUISEL, MIISEL
Physical Interface 100 Mbps TXEN100, CRS100, COL100, RX_DV,
RX_ER, TXD0-TXD3, RXD0-RXD3, MDI,
MDO, MCLK
16
Clocks
TX25, RX25
2
2
Miscellaneous
TOTAL
RBIAS, nCSOUT
204
11
SMSC [ SMSC CORPORATION ]
