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