Rainbow Electronics W90P710CDG User 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.