Rainbow Electronics W90N745CDG - Manual (Page 130)

W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
- 125 - Revision A2
MII Management Function Frame Format
In IEEE Std. 802.3 clause 22.2.4, the MII management function is defined. The MII management
function is used for the purpose of controlling the PHY and gathering status from the PHY. The MII
management frame format is shown as follow.
MANAGEMENT FRAME FIELDS
PRE ST OP PHYAD REGAD TA DATA IDLE
READ 1…1 01 10 AAAAA RRRRR Z0 DDDDDDDDDDDDDDDD Z
WRITE 1…1 01 01 AAAAA RRRRR 10 DDDDDDDDDDDDDDDD Z
MII Management Function Configure Sequence
READ WRITE
1. Set appropriate MDCCR.
2. Set PHYAD and PHYRAD.
3. Set Write to 1’b0
4. Set bit BUSY to 1’b1 to send a MII
management frame out.
5. Wait BUSY to become 1’b0.
6. Read data from MIID register.
7. Finish the read command.
1. Write data to MIID register
2. Set appropriate MDCCR.
3. Set PHYAD and PHYRAD.
4. Set Write to 1’b1
5. Set bit BUSY to 1’b1 to send a MII
management frame out.
6. Wait BUSY to become 1’b0.
7. Finish the write command.