MII全称是Media Independent Interface,直译过来就是介质独立接口,它是IEEE-802.3定义的以太网标准接口,MII接口用于以太网MAC连接PHY芯片,连接示意图如下所示: MII接口一共有16根信号线,含义如下: TX_CLK:发送时钟,如果网速为100M的话时钟频率为25MHz,10M网速的话时钟频率为2.5MHz,此时钟由PHY产生并发送给MAC。 TX_...
MAC与PHY连接的管理接口MDIO MII Management interface用于MAC层或其他控制芯片(不一定是MAC层芯片,可能是MCU,如高通芯片建构中,1个MAC芯片可以控制2个PHY芯片,然后MCU控制3个网卡(MAC+2PHY)芯片)控制、配置PHY层芯片。 Through MII Management interface it is possible to control and configure multiple PHY devices...
Management Interface),也被称作MII管理接口(MIIManagement Interface),包括MDC和MDIO两条信号线。MDIO是一个PHY的管理接口,用来读/写PHY的寄存器,以控制PHY的行为或获取PHY的状态,MDC为MDIO提供时钟。MDIO原本是为MII总线接口定义的,MII用于连接MAC和PHY,包含两种信号接口: 1.一个数据接口用于MAC和PHY之间 ...
I did some hunting and figured out that our kernel config had MDIO_FIXED_PHY defined, which creates a virtual MDIO device which all of our queries were going to - none of them were going down to the hardware level, because they had been redirected to this virtual interface. I'm not...
We also know that we can use the "MDI Single Command and Address - MSCA 0x000425C and MSRWD" to access external phy. Could you use our case to give us a detail steps to access external phy through MDC/MDIO? What value of the DEVADD, OPCODE, STCODE, and MDICMD should be filled ...
https://source.codeaurora.org/external/imx/linux-imx/tree/Documentation/devicetree/bindings/net/dsa/... per KSZ8795 datasheet sect.3.5.1.2 MII Management Interface (MIIM) : "The MIIM interface does not have access to all the configuration registers in the KSZ8795CLX. It can only access the...
(Serial Management Interface),也被称作MII管理接口(MII Management Interface),包括MDC和MDIO两条信号线。MDIO是一个PHY的管理接口,用来读/写PHY的寄存器,以控制PHY的行为或获取PHY的状态,MDC为MDIO提供时钟。MDIO原本是为MII总线接口定义的,MII用于连接MAC和PHY,包含两种信号接口: 1.一个数据接口用于MAC ...
#define MII_MANAGEMENT_CLOCK_SPEED 2500000 // typ. 2.5MHz Speed #define PHY_IDENTIFIER 0x00221560 // MICREL KSZ8081RNA identifier #define PHY_MASK 0xfffffff0 // don't check the revision number #define PHY_ADDRESS 0x00 // address of external PHY on board #define PHY_REG_ID1 0x02 // ...
Both signals require an external pull-up resistor. Consult your PHY's datasheet for the correct pull-up resistor value. 1K Ohm is a typical resistor value. GUIDELINE: Ensure interface timing that MDIO requires. MDIO requires a 10 ns setup and hold time for data with respect to MDC. ...
MDIO Management System MDIO Bus System MDIO Transactions Write Transaction Read Transaction MDIO Addressing Physical Address Register Address Connecting the MDIO to an Internally Integrated STA Connecting the MDIO to an External PHY Device Register Space ...