LAN91C100FD datasheet(11/79 Pages) SMSC

11 / 79 page

FEAST Fast Ethernet Controller with Full Duplex Capability

SMSC DS – LAN91C100FD Rev. D

Page 11

Rev. 10/14/2002

PRELIMINARY

PQFP/TQFP

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

20, 21, 22,

Receive

Data

RXD0-

RXD3

Inputs. Received Data nibble from MII PHY.

These pins are ignored when MIISEL is low.

198

Manage-

ment Data

Input

MDI

I with

pulldown

MII management data input.

196

Manage-

ment Data

Output

MDO

MII management data output.

192

Manage-

ment

Clock

MCLK

MII management clock.

Receive

Error

RX_ER

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.

nChip

Select

Output

nCSOUT

Output. Chip Select provided for mapping of

PHY functions into LAN91C100FD decoded

space. Active on accesses to LAN91C100FD’s

eight lower addresses when the BANK

SELECTED is 7.

nReceive

Packet

Discard

nRXDISC

I with

pullup

Input. Used to discard the receive packet being

stored in memory. Assertion of the pin during a

packet reception results in the interruption of

packet reception into memory. The memory

allocated to the packet and the packet number in

use are freed. The input is driven

asynchronously and is synchronized internally by

the LAN91C100FD. Pin assertion may take

place at any time during the receive DMA

packet. The assertion has no effect if there is no

packet being DMAed to memory or if asserted

during the last DMA write to memory. Works for

both MII and ENDEC. The typical use of

nRXDISC is with the LAN91C100FD in PRMS

mode with an external associative memory use

for address filtering. *Note: The pin must be

asserted for a minimum of 80ns.

RDMAH

Output. Active when the first dword of the

address is written (RCVDMA=1, RA10-RA4=0,

RA3-RA2=X).

Buffer Types

Output buffer with 2mA source and 4mA sink

O12

Output buffer with 6mA source and 12mA sink

O16

Output buffer with 8mA source and 16mA sink

O24

Output buffer with 12mA source and 24mA sink

OD16

Open drain buffer with 16mA sink

LAN91C100FD Datasheet(PDF) 11 Page - SMSC Corporation

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