AX88615 Datasheet, PDF (26/26 Pages) ASIX Electronics Corporation – 5-Port 10/100BASE Ethernet Switch

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
0fh
Port 1
10h
Port 2
11h
Port 3
12h
Port 4
13h
The corresponding option setting
/RdPhy_En = 0
B.2 Using MII I/F connects to MAC
Using MII interface to connect to MAC type device application for AX88615 is illustrated bellow.
3.3V
10K * 2
25MHz
Clock
SDUPLEX0
SCOL_SP0
COL
STXEN0
STXCLK0
STXD0[3:0]
CRS
RX_DV
RX_CLK
RXD[3:0]
RX_ER
SCRS0
SRXDV0
SRXCLK0
SRXD0[3:0]
TX_EN
TX_CLK
TXD[3:0]
10K
TX_ER
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
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ASIX ELECTRONICS CORPORATION