AX88655P Datasheet, PDF (10/40 Pages) ASIX Electronics Corporation – 5-Port 10/100/1000BASE-T Ethernet Switch

AX88655 P 5-Port 10/100/1000BASE-T Ethernet Switch
2.1.5 GMII Interface Port 4
Signal Name I/O Pin No.
GTX_CLK4
O
138
Description
125MHz Clock Output: Please references section 2.1.1.
TX_EN4
O
149
Transmit Enable: Please references section 2.1.1.
TXD4[7:0]
O
148 – 141 Transmit Data: Please references section 2.1.1.
TX_CLK4
COL4
CRS4
RX_DV4
RX_CLK4
RXD4[7:0]
I/PD
140
MII Transmit Clock Input: Please references section 2.1.1.
I/PD
126
Collision Detect: Please references section 2.1.1.
I/PD
125
Carrier Sense: Please references section 2.1.1.
I
136
Receive Data Valid: Please references section 2.1.1.
I
135
Receive Clock Input: Please references section 2.1.1.
I/PD 134 - 127 Receive Data: Please references section 2.1.1.
2.2 Miscellaneous
Signal Name I/O
X_IN
I
X_OUT
O
GCLK
I
SYSCLK
I
/GCLK _EN
I/PU
/SYSCLK_EN
I/PU
FILTER
/RST
MDIO
I
I
I/O/PU
MDC
SDIO
O
I/O/PU
Pin No.
35
36
161
168
157
158
40
170
165
166
163
Description
Crystal or OSC 27MHz Input: This is a clock source of PLL. The
PLL will generate a 90MHz internal clock.
Crystal 27MHz Output: This pin should be floating with single-ended
external clock.
OSC 125MHz Input: 125MHz Clock for GMII
System Clock Input: 85 ~ 90MHz Clock for switch kernel
GCLK Enable: 0) use GCLK; 1) Reserved
System Clock Enable: 0) use SYSCLK; 1) 90MHz generated by
internal PLL circuit from X_IN clock source.
FILTER: For internal PLL circuit use.
Reset: Active Low
Station Management Data In/Out: PHY Management Data Input and
Output.
Station Management Data Clock Out: PHY Management Clock.
EEPROM Data In/Out: EEPROM Serial Data Input and Output.
SDC
SID[4:0]
GPIO[4:0]
I/O/PU
I/PD
I/PD
I/PD
I/UP
I/UP
I/O/PU
164
156,
155,
154,
153,
152
180 - 176
EEPROM Data Clock In/Out: EEPROM Serial Clock. (Note: It is
output pin if the embedded MPU is active; otherwise as input pin)
Switch ID: MPU can identify the switch and PHYs with this ID.
Default is “00011b”.
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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