AX88872P Datasheet, PDF (35/36 Pages) ASIX Electronics Corporation – 10/100BASE Dual Speed “Swipeater” Controller

AX88872P Swipeater Controller
CONFIDENTIAL
PRELIMINARY
Appendix B: Design Note
B.1 Using Station Management (STA) Connection
There are two methods to get two switch port speed and duplex information in AX88872 . One way is by hardware pins
such as SPEED0, SDUPLEX0, SPEED1, SDUPLEX1. AX88872 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. For the PHY connected to repeater ports must be configured by STA write function. In a word, AX88872 use STA
read function to get PHY register status for switch port and use STA write function to program PHY register for hub port.
The address setting of PHY must be fixed as follows:
Application 1: 8 hub ports + 2 switch ports application
RP : repeater port SP : switch port
RP0 RP1 RP2 RP3 RP4 RP5 RP6 RP7 SP0 SP1
04h 05h 06h 07h 08h 09h 0ah 0bh 0fh 10h
The corresponding option setting
/RdPhy_En = 0, WrPhyNo_S = 1, WrPhyStrAddr = 1
Application 2: 6 hub ports + 2 switch ports application
RP : repeater port SP : switch port
RP0 RP1 RP2 RP3 RP4 RP5 SP0 SP1
18h 19h 1ah 1bh 1ch 1dh 1eh 1fh
The corresponding option setting
/RdPhy_En = 0, WrPhyNo_S = 0, WrPhyStrAddr = 0
35
ASIX ELECTRONICS CORPORATION