FEAST Fast Ethernet Controller for PCMCIA and Generic 16-Bit Applications
144 TQFP
NAME
PIN NO.
86,84,85, RAM
75,72,80, 82- Address
83,81, 77,74- Bus
73, 71-70,67
78
24,44,58, 68
2
3
Crystal 1
Crystal 2
SYMBOL
RA[16:2]
BUFFER
TYPE
O4
DESCRIPTION
Outputs. This bus specifies the buffer RAM
doubleword being accessed by the LAN91C110.
nROE
nRWE[3:0]
XTAL1
XTAL2
1
139
23
nLink
nLNK
Status
AUI Select AUISEL
TXEN100
Transmit
Enable
MII
12
Carrier
Sense MII
8
Receive
Data Valid
11
Collision
Detect MII
18,19,21, 22 Transmit
Data
6
Transmit
Clock
10
Receive
Clock
16-13
Receive
Data
141
Manage-
ment Data
Input
140
Manage-
ment Data
Output
137
Manage-
ment
Clock
7
Receive
Error
Output. Active low signal used to read a
doubleword from buffer RAM.
O4
Outputs. Active low signals used to write any
byte, word or dword in RAM.
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.
I with pullup Input. General purpose input port used to convey
LINK status (EPHSR bit 14).
O4
Output. Non volatile output pin. Driven by AUI
SELECT (CONFIG bit 8).
O12
Output to MII PHY. Envelope to 100 Mbps
transmission.
I with
pulldown
I with
pulldown
I with
pulldown
O12
Input from MII PHY. Envelope of packet reception
used for deferral and backoff purposes.
Input from MII PHY. Envelope of data valid
reception. Used for receive data framing.
Input from MII PHY. Collision detection input.
Outputs. Transmit Data nibble to MII PHY.
O4
CRS100
RX_DV
COL100
TXD[3:0]
TX25
RX25
RXD[3:0]
MDI
I with pullup Input. Transmit clock input from MII. Nibble rate
clock (25 MHz).
I with pullup Input. Receive clock input from MII PHY. Nibble
rate clock.
I
Inputs. Received Data nibble from MII PHY.
I with
pulldown
O4
MII management data input.
MDO
MII management data output.
MCLK
O4
MII management clock.
RX_ER
I with
pulldown
Input. Indicates a code error detected by PHY.
Used by the LAN91C110 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).
SMSC DS – LAN91C110 REV. B
Page 6
Rev. 09/05/02
SMSC [ SMSC CORPORATION ]
