ASIX ELECTRONICS CORPORATION

26

CONFIDENTIAL

AX88615P 5-Port 10/100Mb Switch Controller

PRELIMINARY

Appendix B: Design Note

B.1 Using Station Management (STA) Connection

There are two methods to get per port speed and duplex information in AX88615 . One way is by hardware pins such as

SPEED0, SDUPLEX0, SPEED1, SDUPLEX1. Ax88615 also provides 2 pins (MDC and MDIO, STA – Station

Management connection) to read PHY Auto Negotiation Remote Capability register to get current speed and duplex

status. When use STA function, the connected PHY address settings must be fixed as follows:

Port 0

Port 1

Port 2

Port 3

Port 4

0fh

10h

11h

12h

13h

The corresponding option setting

/RdPhy_En = 0

B.2 Using MII I/F connects to MAC

3.3V

10K * 2

10K

Gnd

AX88615 / Switch

AX88195 / MAC

Note : 1. The MAC needs to run at fullduplex mode.

2. Care must be taken that the receive side has enough setup and/or hold time

3. Some kind of CPU with embbeded MAC can also refer to this example

SDUPLEX0

SCOL_SP0

STXEN0

STXCLK0

STXD0[3:0]

SCRS0

SRXDV0

SRXCLK0

SRXD0[3:0]

COL

CRS

RX_DV

RX_CLK

RXD[3:0]

RX_ER

TX_EN

TX_CLK

TXD[3:0]

TX_ER

25MHz

Clock