PRELIMINARY

INFORMATION

XpressFlow-2020 Series –

EA218E

Ethernet Switch Chipset

8-Port 10Mb Ethernet Access Controller

© 1998 Zarlink Semiconductor, Inc.

18

Rev.2.1 – February, 1999

2.4 10Mb Serial Interface for Port 0 through 7

Fully compliant with IEEE 802.3 10M bit Serial Interface Stan-

dard for connecting with external 10Mbps Ethernet Physical

Layer Transceiver

Supports 10Mbps 10BaseT serial interface

Supports both half and full duplex operation

2.4.1 Pin Description

Symbol

Type

Name and Functions

Tn_RXD

TTL In

(5VT)

Receive Data – (one for each 10M bit Serial Interface Port) a receive data stream.

Tn_RXC

TTL In

(5VT)

Receive Clock – (one for each 10M bit Serial Interface Port) from external phy for sampling the

receive data from Tn_RXD input

Tn_TXC

TTL In

(5VT)

Transmit Clock – (one for each 10M bit Serial Interface Port) a continuous clock input with

35% to 65% duty cycles.

Tn_TXEN

CMOS

Output

Transmit Enable – (one for each 10M bit Serial Interface Port)

Tn_TXD

CMOS

Output

Transmit Data – (one for each 10M bit Serial Interface Port) a transmit data stream.

Tn_LPBK

CMOS

Output

Loop Back Enable – (one for each 10M bit Serial Interface Port) The polarity of this signal is

programmable via Port Configuration Register

Tn_FD

CMOS

Output

Full Duplex Mode – (one for each 10M bit Serial Interface Port) The polarity of this signal is

programmable via Port Configuration Register

Tn_COL

TTL In

(5VT)

Collision Detected – (one for each 10M bit Serial Interface Port)

Tn_CRS

TTL In

(5VT)

Carrier Sense – (one for each 10M bit Serial Interface Port)

Tn_LNK

TTL In

(5VT)

Link Status – (one for each 10M bit Serial Interface Port) The polarity of this signal is pro-

grammable via Port Configuration Register

Note:“n” is the port number [7:0]

These signals have programmable output polarity.

100 nsec

100 nsec

TXC

TXEN

TXD

10M bit Serial Interface – Transmit Timing