91C100FDREVB Datasheet, PDF (49/68 Pages) SMSC Corporation – FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY

VL BUS
SIGNAL
IRQn
D0-D31
nLDEV
VCC
GND
OPEN
Table 3 - VL Local Bus Signal Connections
LAN91C100
SIGNAL
NOTES
created typically by using nADS delayed by one LCLK.
INTR0-INTR3
Typically uses the interrupt lines on the ISA edge connector of VL
bus
D0-D31
32 bit data bus. The bus byte(s) used to access the device are a
function of nBE0-nBE3:
nBE0 nBE1 nBE2 nBE3
00 0
0 Double word access
00
1
1 Low word access
11
0
0 High word access
01
1
1 Byte 0 access
10
1
1 Byte 1 access
11
0
1 Byte 2 access
11
1
0 Byte 3 access
nLDEV
nRD nWR
A1 nVLBUS
nDATACS
Not used = tri-state on reads, ignored on writes. Note that nBE2
and nBE3 override the value of A1, which is tied low in this
application.
nLDEV is a totem pole output. nLDEV is active on valid decodes of
A15-A4 and AEN=0.
UNUSED PINS
SMSC DS – LAN91C100FD REV. B
Page 49
Rev. 05/31/2000