91C100FDREVB Datasheet, PDF (8/68 Pages) SMSC Corporation – FEAST FAST ETHERNET CONTROLLER WITH FULL DUPLEX CAPABILITY

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