Rainbow Electronics W90P710CDG - Manual (Page 128)

W90P710CD/W90P710CDG
- 128 -
Continued.
BITS DESCRIPTIONS
[12:8] PHYAD
The PHY Address keeps the address to differentiate which external
PHY is the target of the MII management command.
[7:5] Reserved -
[4:0] PHYRAD
The PHY Register Address keeps the address to indicate which
register of external PHY is the target of the MII management
command.
MDCCR [23:20] MDC CLOCK PERIOD MDC CLOCK FREQUENCY
4’b0000 4 x T
HCLK
HCLK/4
4’b0001 6 x T
HCLK
HCLK/6
4’b0010 8 x T
HCLK
HCLK/8
4’b0011 12 x T
HCLK
HCLK/12
4’b0100 16 x T
HCLK
HCLK/16
4’b0101 20 x T
HCLK
HCLK/20
4’b0110 24 x T
HCLK
HCLK/24
4’b0111 28 x T
HCLK
HCLK/28
4’b1000 30 x T
HCLK
HCLK/30
4’b1001 32 x T
HCLK
HCLK/32
4’b1010 36 x T
HCLK
HCLK/36
4’b1011 40 x T
HCLK
HCLK/40
4’b1100 44 x T
HCLK
HCLK/44
4’b1101 48 x T
HCLK
HCLK/48
4’b1110 54 x T
HCLK
HCLK/54
4’b1111 60 x T
HCLK
HCLK/60
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.