AX88655P ASIX [ASIX Electronics Corporation], AX88655P Datasheet - Page 8

• Manufacturer Part Number: AX88655P
• Description: 5-Port 10/100/1000BASE-T Ethernet Switch
• Manufacturer: ASIX [ASIX Electronics Corporation]

2.0 Pin Descriptions
2.0 I/O Definition
2.1 GMII/MII Interface
2.1.1 GMII Interface Port 0
GTX_CLK0
TX_EN0
TXD0[7:0]
TX_CLK0
COL0
CRS0
RX_DV0
RX_CLK0
RXD0[7:0]
The following terms describe the AX88655 pin-out:
All pin names with the “/” suffix are asserted low.
The following abbreviations are used in following Tables.
Signal Name
I
O
I/O
OD
Input
Output
Input/Output
Open Drain
I/PD
I/PD
I/PD
I/PD
I/O
O
O
O
I
I
256 – 253
246 - 239
Pin No.
4 – 1,
250
252
238
237
248
247
5
125MHz Clock Output: it is a continuous 125 MHz clock output to
giga-PHY operating at 1000BASE-T. That is, it is a timing reference
for TX_EN0 and TXD0[7:0]
Transmit Enable: When TX_EN0 is asserted, data on TXD0[7:0] are
transmitted onto PHY. TX_EN0 is synchronous to GTX_CLK0 in
1000BASE-T mode and synchronous to TX_CLK0 in 10/100BASE-T
mode.
Transmit Data: Synchronous to the rising of GTX_CLK0 in
1000BASE-T mode. And synchronous to rising edge of TX_CLK0 in
10/100BASE-T mode.
MII Transmit Clock Input: TX_EN0 and TXD0[3:0] are
synchronous to the rising edge of this clock in 10/100BASE-T mode.
Collision Detect: Active high to indicate that there is collision
occurred in half duplex mode. In full duplex mode COL0 is always low.
Carrier Sense: Active high if there is carrier on medium. In half
duplex mode CRS0 is also asserted during transmission and
asynchronous to any clock.
Receive Data Valid: Active high to indicate that data presented on
RXD0[7:0] is valid and synchronous to RX_CLK0.
Receive Clock Input: 125, 25 and 2.5 MHz is running at 1000/100/10
BASE-T mode respectively. RX_DV0 and RXD0[7:0] are synchronous
to rising edge of this clock.
Receive Data: Data received by the PHY are presented on RXD0 and
synchronous
10/100/1000BASE-T and RXD[7:4] is valid only in 1000BASE-T
modes.
AX88655 P 5-Port 10/100/1000BASE-T Ethernet Switch
8
to
PU
PD
P
RX_CLK0.
Description
ASIX ELECTRONICS CORPORATION
Pull Up
Pull Down
Power Pin
RXD0[3:0]
is
valid
in