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DS80C400 Network Microcontroller
56 of 96
CSR Register:
MII Address
Register Address:
14h
Bit Names:
31
—
—
—
—
—
—
—
—
24
23
—
—
—
—
—
—
—
—
16
15
PHYA [4:0]
PHYR [4:2]
8
7 PHYR
[1:0] —
—
—
—
W/
R
BUSY 0
Reset State:
31
0
0
0
0
0
0
0
0
24
23
0
0
0
0
0
0
0
0
16
15 0 0 0 0 0 0 0 0
8
7 0 0 0
0
0
0
0 0
0
PHYA[4:0], PHY Address [4:0].
This 5-bit address specifies the PHY address for 2-wire MII serial-management
bus communication.
PHYR[4:0], PHY Register Select [4:0].
This 5-bit field specifies the PHY register to be accessed in 2-wire MII
serial-management bus communication.
W/
R
, Write/Read.
This bit is used to indicate whether a write or read operation is to be requested of the addressed
PHY/PHY register.
0 = read
1 = write
BUSY
,
Busy.
This status bit indicates when PHY communication is currently taking place on the MII serial-
management bus. The application must wait until BUSY = 0 before modifying the MII address and MII data
registers prior to each read/write operation.
0 = MII serial-management bus idle
1 = MII serial-management bus busy (write/read in progress)
CSR Register:
MII Data
Register Address:
18h
Bit Names:
31
—
—
—
—
—
—
—
—
24
23
—
—
—
—
—
—
—
—
16
15 PHYD
[15:8]
8
7 PHYD
[7:0]
0
Reset State:
31
0
0
0
0
0
0
0
0
24
23
0
0
0
0
0
0
0
0
16
15 0 0 0 0 0 0 0 0
8
7 0 0 0 0 0 0 0 0
0
PHYD[15:0]
,
PHY Data [15:0].
These 16 bits contain the data read from the PHY register following a read
operation, or the data to be written to the PHY register prior to a write operation.
Содержание DS80C400
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