HS_Media independent interface (MII)
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Doc ID 018672 Rev 1
24.7.20 MII
address
register (Register4, MAC)
The MII Address is a register which controls the management cycles to the external PHY
through the management interface. The MII address bit assignments are given in
●
PA
This 5 bit field tells which of the 32 possible PHY devices are being accessed.
●
GR
This 5 bit field selects the desired MII register in the selected PHY device.
●
CR
This 3 bit field allows selection of frequency range of CSR clock (provided as input by
the application) and it is used to set the frequency of the MDC (MAC DMA Controller)
clock, according to encoding below:
Table 448.
MII address register bit assignments
Bit
Name
Reset Value
Type
Description
[31:16]
Reserved
-
RO
Read: undefined.
[15:11]
5’h0
RW
Physical Layer Address.
[10:06]
5’h0
RW
MII Register.
[05]
Reserved
-
RO
Read: undefined.
[04:02]
3’h0
RW
CSR Clock Range.
[01]
1’h0
RW
MII Write.
[00]
1’h0
RW
MII Busy.