W90N745CD Datasheet, PDF (130/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
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.
READ
WRITE
PRE
1…1
1…1
MANAGEMENT FRAME FIELDS
ST OP PHYAD REGAD TA DATA
01 10 AAAAA RRRRR Z0 DDDDDDDDDDDDDDDD
01 01 AAAAA RRRRR 10 DDDDDDDDDDDDDDDD
IDLE
Z
Z
MII Management Function Configure Sequence
READ
WRITE
1. Set appropriate MDCCR.
1. Write data to MIID register
2. Set PHYAD and PHYRAD.
2. Set appropriate MDCCR.
3. Set Write to 1’b0
3. Set PHYAD and PHYRAD.
4. Set bit BUSY to 1’b1 to send a MII 4. Set Write to 1’b1
management frame out.
5. Set bit BUSY to 1’b1 to send a MII
5. Wait BUSY to become 1’b0.
management frame out.
6. Read data from MIID register.
6. Wait BUSY to become 1’b0.
7. Finish the read command.
7. Finish the write command.
Publication Release Date: September 22, 2006
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Revision A2