AX88655P datasheet(10/40 Pages) ASIX

10 / 40 page

ASIX ELECTRONICS CORPORATION

AX88655 P 5-Port 10/100/1000BASE-T Ethernet Switch

2.1.5 GMII Interface Port 4

Signal Name

I/O

Pin No.

Description

GTX_CLK4

138

125MHz Clock Output: Please references section 2.1.1.

TX_EN4

149

Transmit Enable: Please references section 2.1.1.

TXD4[7:0]

148 – 141

Transmit Data: Please references section 2.1.1.

TX_CLK4

I/PD

140

MII Transmit Clock Input: Please references section 2.1.1.

COL4

I/PD

126

Collision Detect: Please references section 2.1.1.

CRS4

I/PD

125

Carrier Sense: Please references section 2.1.1.

RX_DV4

136

Receive Data Valid: Please references section 2.1.1.

RX_CLK4

135

Receive Clock Input: Please references section 2.1.1.

RXD4[7:0]

I/PD

134 - 127

Receive Data: Please references section 2.1.1.

2.2 Miscellaneous

Signal Name

I/O

Pin No.

Description

X_IN

Crystal or OSC 27MHz Input: This is a clock source of PLL. The

PLL will generate a 90MHz internal clock.

X_OUT

Crystal 27MHz Output: This pin should be floating with single-ended

external clock.

GCLK

161

OSC 125MHz Input: 125MHz Clock for GMII

SYSCLK

168

System Clock Input: 85 ~ 90MHz Clock for switch kernel

/GCLK _EN

I/PU

157

GCLK Enable: 0) use GCLK; 1) Reserved

/SYSCLK_EN

I/PU

158

System Clock Enable:

0) use SYSCLK; 1) 90MHz generated by

internal PLL circuit from X_IN clock source.

FILTER

FILTER: For internal PLL circuit use.

/RST

170

Reset: Active Low

MDIO

I/O/PU

165

Station Management Data In/Out: PHY Management Data Input and

Output.

MDC

166

Station Management Data Clock Out: PHY Management Clock.

SDIO

I/O/PU

163

EEPROM Data In/Out: EEPROM Serial Data Input and Output.

SDC

I/O/PU

164

EEPROM Data Clock In/Out: EEPROM Serial Clock. (Note: It is

output pin if the embedded MPU is active; otherwise as input pin)

SID[4:0]

I/PD

I/UP

156,

155,

154,

153,

152

Switch ID: MPU can identify the switch and PHYs with this ID.

Default is “00011b”.

GPIO[4:0]

I/O/PU

180 - 176

General Purpose I/O: The 5 GPIOs can be programmed for special

application.

(Note: The function is not released to user normally.

Please contact with ASIX directly if any requirement)

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