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LAN89730 bảng dữ liệu(PDF) 169 Page - Microchip Technology |
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LAN89730 bảng dữ liệu(HTML) 169 Page - Microchip Technology |
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169 / 218 page ![]() 2013-2015 Microchip Technology Inc. DS60001348A-page 169 LAN89730 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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