5228-DS06-R datasheet(23/100 Pages) BOARDCOM

23 / 100 page

Data Sheet

BCM5228

7/12/04

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

Document

5228-DS09-405-R

Hardware Signal Definition Table

Page 11

A02

A03

B04

A04

R03

R02

T03

T02

204

203

202

201

206

205

204

203

CRS_DV{1:8}

O3S

Carrier Sense/Receive Data Valid. In RMII

mode, CRS_DV shall be asserted by the PHY

when the medium is non-idle. The data on

RXD1,RXD0 is considered valid once

CRS_DV is asserted. During a false carrier

event, CRS_DV shall remain asserted for the

duration of carrier activity. CRS_DV is not

synchronized with respect to REF_CLK.

D14

D15

E14

E15

F12

F13

G12

G14

H12

H13

J12

J14

K12

K13

L12

L14

151

152

147

148

141

142

137

138

129

130

125

126

119

120

115

116

151

152

147

148

141

142

137

138

129

130

125

126

119

120

115

116

RXD1{1}

RXD0{1}

RXD1{2}

RXD0{2}

RXD1{3}

RXD0{3}

RXD1{4}

RXD0{4}

RXD1{5}

RXD0{5}

RXD1{6}

RXD0{6}

RXD1{7}

RXD0{7}

RXD1{8}

RXD0{8}

O3S

Receive Data Outputs. In RMII mode,

RXD1,RXD0 data is output synchronous with

REF_CLK. For each clock period in which

CRS_DV is asserted, RXD1,RXD0 transfers 2

bits of data from the PHY. RXD1 is the most

significant bit.

In SMII mode, the RXD0{1:8} form the SRXD

pins for each PHY.

D02

D01

C02

C01

N03

M01

M02

L01

RX_ER{1:8}

O3S

Receive Error Detected. In RMII mode,

RX_ER is asserted high for one or more

REF_CLK periods to indicate that an error

was detected somewhere in the frame

presently being transferred from the PHY.

RX_ER transitions synchronously with

respect to REF_CLK.

Serial Media Independent Interface (SMII)

H01

SMII_EN/SLED_CLK

I/OPU

SMII Enable. Active high. An active high or

being left unconnected during power-on reset

selects the SMII mode, while an active low

selects the RMII mode.

Serial LED Clock. After power-on reset, if

Serial or Low-Cost Serial LED mode is

enabled, this pin sources the clock for serial

data SLED_DO. For details, see “LED

Modes” on page 29.

Table 2: Pin Definitions (Cont.)

BCM5228B BCM5228F BCM5228U Pin Label

I/O

Description

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