AX88875AP Bripeater

ASIX ELECTRONICS CORPORATION

8

2.0 Pin Description

The following terms describe the AX88875A pinout:

All pin names with the “/” suffix are asserted low.

I

=

Input

O

=

Output

I/O

=

Input /Output

2.1 MII interfaces

Signal Name

Type

Pin No.

Description

TXER[4:0]

Or

COL[4:0]

O

or

I

66, 44, 28

9, 154

Transmit Error : When /HALF10 pin set to “high”. TXER is transition

synchronously with respect to the rising edge of TXCLK . Asserted

high when a code violation is request to be send

Collision : When /HALF10 pin set to “low”. COL is input from PHY,

when 10Mbps PHY is in half-duplex mode.

TXD[4:0][3:0]

O

65 – 62, 43 – 40

27 – 24, 8 – 5

153 - 150

Transmit Data : TXD[3:0] is transition synchronously with respect to

the rising edge of TXCLK. For each TXCLK period in which TXEN is

asserted, TXD[3:0] are accepted for transmission by the PHY.

TXEN[4:0]

O

61, 39, 23

4, 149

Transmit Enable : TXEN is transition synchronously with respect to the

rising edge of TXCLK. TXEN indicates that the port is presenting

nibbles on TXD [3:0] for transmission.

RXD[4:0][3:0]

I

60 – 57, 37 – 34

22 – 19, 3, 2

160, 159,

147 - 144

Receive Data : RXD [3:0] is driven by the PHY synchronously with

respect to RXCLK.

RXER[4:0]

I

51, 30, 15,

155, 140

Receive Error : RXER ,is driven by PHY and synchronous to RXCLK,

is asserted for one or more RXCLK periods to indicate to the port that

an error has detected.

RXCLK[4:0]

I

56, 33,

18, 158, 143

Receive Clock : RX_CLK is a continuous clock that provides the

timing reference for the transfer of the RXDV,RXD [3:0] and RXER

signals from the PHY to the MII port of the repeater.

RXDV[4:0]

I

52, 31,

16, 156, 141

Receive Data Valid : RX_DV is driven by the PHY synchronously with

respect to RXCLK. Asserted high when valid data is present on RXD

[3:0].

CRS[4:0]

I

53, 32,

17, 157, 142

Carrier Sense : Asynchronous signal CRS is asserted by the PHY when

receive medium is non-idle at full duplex mode.

COL_O[4]

O

67

Collision : Collision detection signal for port 4