DS80C400_03 Datasheet, PDF (56/96 Pages) Maxim Integrated Products – Network Microcontroller

DS80C400 Network Microcontroller
CSR Register:
Register Address:
MII Address
14h
Bit Names:
31
ó
ó
ó
ó
ó
ó
ó
ó
24
23
ó
ó
ó
ó
ó
ó
ó
ó
16
15
PHYA [4:0]
PHYR [4:2]
8
7
PHYR [1:0]
ó
ó
ó
ó
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:
Register Address:
MII Data
18h
Bit Names:
31
ó
ó
ó
ó
ó
ó
ó
ó
24
23
ó
ó
ó
ó
ó
ó
ó
ó
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.
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