Being media independent means that different types of PHY devices for connecting to different media (i.e. The MII is standardized by IEEE 802.3u and connects different types of PHYs to MACs. The media-independent interface ( MII) was originally defined as a standard interface to connect a Fast Ethernet (i.e., 100 Mbit/s) media access control (MAC) block to a PHY chip. MPU chooses the register address register of CPLD inside then again by address bus and control bus, write 0x10 by parallel data bus line, because detecting PHY address register most significant digit in the parallel bus module of CPLD is 0, assert and this time be operating as read operation, the MDIO interface module is given in PHY address and register address, inform simultaneously and this time be read operation, the MDIO interface module is initiated the read operation sequential according to the PHY address of receiving and register address, and receive the data that the Switch address register returns, be given to the parallel bus module after receiving, the parallel bus module is preserved the data that obtain from the MDIO interface module, be kept in the read data register, trigger the interruption of MPU control bus simultaneously, inform that the MPU data are ready in the read data register of CPLD, MPU has no progeny in receiving, passes through control bus, address bus and data bus obtain the data of reading, and so far whole read procedure is finished.ĭescribed CPLD comprises parallel bus module, MDIO interface module Wherein said parallel bus module comprises PHY address register, register address register, read data register, write data register Described MDIO interface module comprises clock cable and data signal line, directly links to each other with the MDIO interface of Switch The parallel bus module of wherein said CPLD satisfies the bus timing of MPU by programming, and the MDIO interface module of described CPLD satisfies the sequential requirement of MDIO management interface.MII connector on a Sun Ultra 1 Creator workstation Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Fujian Star Net Communication Co Ltd filed Critical Fujian Star Net Communication Co Ltd Priority to CN 201320149384 priority Critical patent/CN203204608U/en Application granted granted Critical Publication of CN203204608U publication Critical patent/CN203204608U/en Anticipated expiration legal-status Critical Status Expired - Fee Related legal-status Critical Current Links Original Assignee Fujian Star Net Communication Co Ltd Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Inventor 高如正 Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number CN 201320149384 Other languages Chinese ( zh) Google Patents CN203204608U - Device expanding MDIO interface through parallel bus CN203204608U - Device expanding MDIO interface through parallel bus
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