5220-DS02-R datasheet(19/90 Pages) BOARDCOM

19 / 90 page

Preliminary Data Sheet

BCM5220

04/20/04

Broa d c om Co rp o r a t i o n

Document

5220-DS04-405-R

MII Management

Page 7

Sec t io n 2 : H a rdwa re Si gn al Defi ni ti on Ta ble

Table 3 provides the pin descriptions for the BCM5220.

Table 3: Pin Descriptions

5220KPB 5220KPT

Pin Label

Type

Description

MEDIA Connections

RD+

−

Receive Pair. Differential data from the media is received on the

± signal pair.

TD+

−

Transmit Pair. Differential data is transmitted to the media on

the TD

± signal pair.

Clock

XTALI

XTALO

Crystal Input, Output for MII Mode Only. If these pins are used,

then REF_CLK must be left open. A 25-MHz, parallel-resonant

crystal can be connected between these pins. Accuracy of the

crystal is ± 50 ppm. Connect an appropriate value capacitor from

each pin to GND. Whenever REF_CLK pin is used, ground

XTALI pin and leave XTALO pin unconnected.

REF_CLK

IPD

MII 25-MHz Reference Clock Input. Whenever REF_CLK pin is

used, ground XTALI pin and leave XTALO pin unconnected. This

pin must be driven with a continuous 25-MHz clock. Accuracy is

+/-50 ppm, with a duty cycle between 35% and 65% inclusive.

This pin must be left unconnected when using pins XTALI and

XTALO.

MII Interface

TXC

O3S

Transmit Clock. 25-MHz output in 100BASE-X mode and 2.5

MHz in 10BASE-T MII mode. 10-MHz output in 10BASE-T serial

mode. This clock is a continuously driven output, generated from

the XTALI input.

TXD3

TXD2

TXD1

TXD0

IPD

MII Transmit Data Input. Nibble-wide transmit data stream is

input on these pins synchronous with TXC. TXD[3] is the most

significant bit. Only TXD0 is used in 10BASE-T serial mode.

TXEN

IPD

MII Transmit Enable. Active high. Indicates that the data nibble

on TXD[3:0] is valid.

TXER

IPD

MII Transmit Error. An active high input is asserted when a

transmit error condition is requested by the MAC.

RXC

O3S

MII Receive Clock. 25-MHz output in 100BASE-X MII mode and

2.5-MHz output in 10BASE-T mode. 10-MHz output in 10BASE-

T serial mode. This clock is recovered from the incoming data on

the cable inputs. RXC is a continuously running output clock

resynchronized at the start of each incoming packet. This

synchronization may result in an elongated period during one

cycle while RXDV is low.

RXD3

RXD2

RXD1

RXD0

O3S

MII Receive Data Outputs. Nibble-wide receive data stream is

driven out on these pins synchronous with RXC. RXD[3] is the

most significant bit. Only RXD0 is used in 10BASE-T serial

mode.

[MSB:LSB]; # = active-low signal, I = input, O = output, I/O = bidirectional, IPU = input w/ internal pull-up, OOD = open-drain

output, O3S = three-state output, B = Bias, PWR = power supply, GND = ground

5220-DS02-R 数据表(PDF) 19 Page - Broadcom Corporation.

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