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LAN9730 bảng dữ liệu(PDF) 171 Page - Microchip Technology

tên linh kiện LAN9730
Giải thích chi tiết về linh kiện  High-Speed Inter-Chip USB 2.0 to 10/100 Ethernet Controller
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LAN9730 bảng dữ liệu(HTML) 171 Page - Microchip Technology

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DS00001946A-page 171
LAN9730/LAN9730i
6.4.6
MII ACCESS REGISTER (MII_ACCESS)
This register is used to control the management cycles to the internal PHY.
Address:
114h
Size:
32 bits
Bits
Description
Type
Default
31:16
RESERVED
RO
-
15:11
PHY Address
For every access to this register, this field must be set to 00001b.
R/W
00000b
10:6
MII Register Index (MIIRINDA)
These bits select the desired MII register in the PHY.
R/W
00000b
5:2
RESERVED
RO
-
1
MII Write (MIIWnR)
Setting this bit tells the PHY that this will be a write operation using the MII
data register. If this bit is not set, this will be a read operation, packing the data
in the MII data register.
R/W
0b
0
MII Busy (MIIBZY)
This bit must be polled to determine when the MII register access is complete.
This bit must read a logical ‘0’ before writing to this register or to the MII data
register. The LAN driver software must set (‘1’) this bit in order for the host to
read or write any of the MII PHY registers.
During an MII register access, this bit will be set, signifying a read or write
access is in progress. The MII data register must be kept valid until the MAC
clears this bit during a PHY write operation. The MII data register is invalid
until the MAC has cleared this bit during a PHY read operation.
SC
0b



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