DP83TC811EVM输出RGMII信号问题

您好，

   

    我们采购了一个DP83TC811EVM板，测试RGMII信号输出失败。 

    连接方式如下：

          DP83TC811EVM(master模式) -> 100BaseT1 to 100BaseTx Converter(slave模式) -> PC

     配置如下：

          开发板上所有的Strap寄存器没有贴，但是通过MDIO口，配置了“xMII Control Register” 为0x4241。

     问题：

          当从PC上执行ping命令，EVM板上的LED1会同间隔闪，“RX FIFO Overflow Status”标志也会变成1.

          当从PC上停止ping命令，EVM板上的LED1会常亮，“RX FIFO Overflow Status”标志会变成0.

          这应该意味着PC发送的ping包，EVM已经收到。

          但是当测量PHY的RGMII端口时：

                    RXD0: 一直低电平
                    RXD1: 一直低电平
                    RXD2: 一直高电平
                    RXD3: 一直高电平
                    RCLK: 25MHz
                    RXDV: 一直低电平

          为什么RGMII的RXD端口没有输出收到的数据？是否还有其它寄存器需要设置？

DP83TC811所有寄存器值如下：

[dp83811]==========dump LRE registers============
[dp83811] Reg[0x00]=0x2100
[dp83811] Reg[0x01]=0x0065
[dp83811] Reg[0x02]=0x2000
[dp83811] Reg[0x03]=0xa253
[dp83811] Reg[0x04]=0x0001
[dp83811] Reg[0x05]=0x0000
[dp83811] Reg[0x06]=0x0000
[dp83811] Reg[0x07]=0x2001
[dp83811] Reg[0x08]=0x0000
[dp83811] Reg[0x09]=0x2000
[dp83811] Reg[0x0a]=0x0100
[dp83811] Reg[0x0b]=0x1000
[dp83811] Reg[0x0c]=0x0000
[dp83811] Reg[0x0d]=0x0000
[dp83811] Reg[0x0e]=0x0000
[dp83811] Reg[0x0f]=0x0000
[dp83811] Reg[0x10]=0x1085
[dp83811] Reg[0x11]=0x010b
[dp83811] Reg[0x12]=0x6400
[dp83811] Reg[0x13]=0x4200
[dp83811] Reg[0x14]=0x0000
[dp83811] Reg[0x15]=0x0000
[dp83811] Reg[0x16]=0x0100
[dp83811] Reg[0x17]=0x4241
[dp83811] Reg[0x18]=0x1010
[dp83811] Reg[0x19]=0x0c00
[dp83811] Reg[0x1a]=0x0010
[dp83811] Reg[0x1b]=0x007d
[dp83811] Reg[0x1c]=0x05ee
[dp83811] Reg[0x1d]=0x0000
[dp83811] Reg[0x1e]=0x0000
[dp83811]==========dump MMD registers============
[dp83811] MMD_Reg[0x133]=0x75ff
[dp83811] MMD_Reg[0x16b]=0x0000
[dp83811] MMD_Reg[0x180]=0x0000
[dp83811] MMD_Reg[0x181]=0x0000
[dp83811] MMD_Reg[0x18a]=0x0000
[dp83811] MMD_Reg[0x18b]=0x001a
[dp83811] MMD_Reg[0x18c]=0x0000
[dp83811] MMD_Reg[0x197]=0x013c
[dp83811] MMD_Reg[0x198]=0x034b
[dp83811] MMD_Reg[0x400]=0x1020
[dp83811] MMD_Reg[0x401]=0x000a
[dp83811] MMD_Reg[0x446]=0x0077
[dp83811] MMD_Reg[0x448]=0x0000
[dp83811] MMD_Reg[0x460]=0x2610
[dp83811] MMD_Reg[0x461]=0x0410
[dp83811] MMD_Reg[0x462]=0x0000
[dp83811] MMD_Reg[0x463]=0x0001
[dp83811] MMD_Reg[0x467]=0xc300
[dp83811] MMD_Reg[0x469]=0x0000
[dp83811] MMD_Reg[0x475]=0x0000
[dp83811] MMD_Reg[0x480]=0x0002
[dp83811] MMD_Reg[0x481]=0x00a2
[dp83811] MMD_Reg[0x482]=0x7007
[dp83811] MMD_Reg[0x483]=0x0001
[dp83811] MMD_Reg[0x484]=0x0000
[dp83811] MMD_Reg[0x485]=0x1078
[dp83811] MMD_Reg[0x486]=0x0a05
[dp83811] MMD_Reg[0x487]=0x0a00
[dp83811] MMD_Reg[0x489]=0x0001
[dp83811] MMD_Reg[0x493]=0x0014
[dp83811] MMD_Reg[0x496]=0x044c
[dp83811] MMD_Reg[0x497]=0x01c0
[dp83811] MMD_Reg[0x4a0]=0x1000
[dp83811] MMD_Reg[0x4a1]=0x0000
[dp83811] MMD_Reg[0x4a2]=0x0000
[dp83811] MMD_Reg[0x4a3]=0x0000
[dp83811] MMD_Reg[0x4a4]=0x0000
[dp83811] MMD_Reg[0x4a5]=0x0000
[dp83811] MMD_Reg[0x4a6]=0x0000
[dp83811] MMD_Reg[0x4a7]=0x0000
[dp83811] MMD_Reg[0x4a8]=0x0000
[dp83811] MMD_Reg[0x4a9]=0x0000
[dp83811] MMD_Reg[0x4aa]=0x0000
[dp83811] MMD_Reg[0x4ab]=0x0000
[dp83811] MMD_Reg[0x4ac]=0x0000
[dp83811] MMD_Reg[0x4ad]=0x0000
[dp83811] MMD_Reg[0x4ae]=0x0000
[dp83811] MMD_Reg[0x4af]=0x0000
[dp83811] MMD_Reg[0x4b0]=0x0000
[dp83811] MMD_Reg[0x4b1]=0x0000
[dp83811] MMD_Reg[0x4b2]=0x0000
[dp83811] MMD_Reg[0x4b3]=0x0000
[dp83811] MMD_Reg[0x4b4]=0x0000
[dp83811] MMD_Reg[0x4b5]=0x0000
[dp83811] MMD_Reg[0x4b6]=0x0000
[dp83811] MMD_Reg[0x4b7]=0x0000
[dp83811] MMD_Reg[0x4b8]=0x0000
[dp83811] MMD_Reg[0x4b9]=0x0000
[dp83811] MMD_Reg[0x4ba]=0x0000
[dp83811] MMD_Reg[0x4bb]=0x0000
[dp83811] MMD_Reg[0x4bc]=0x0000
[dp83811] MMD_Reg[0x4bd]=0x0000
[dp83811] MMD_Reg[0x4be]=0x0000
[dp83811] MMD_Reg[0x4bf]=0x0000
[dp83811] MMD_Reg[0x4c0]=0x0000
[dp83811] MMD_Reg[0x4c1]=0x0000
[dp83811] MMD_Reg[0x4c2]=0x0000
[dp83811] MMD_Reg[0x4c3]=0x0000
[dp83811] MMD_Reg[0x4c4]=0x0000
[dp83811] MMD_Reg[0x4c5]=0x0000
[dp83811] MMD_Reg[0x4c6]=0x0000
[dp83811] MMD_Reg[0x4c7]=0x0000
[dp83811] MMD_Reg[0x4c8]=0x0000
[dp83811] MMD_Reg[0x4c9]=0x0000
[dp83811] MMD_Reg[0x4ca]=0x0000
[dp83811] MMD_Reg[0x4cb]=0x0000
[dp83811] MMD_Reg[0x4cc]=0x000c
[dp83811] MMD_Reg[0x4e0]=0x0000
[dp83811] MMD_Reg[0x4e5]=0x00c3
[dp83811]==========dump MMD1 registers============
[dp83811] MMD1_Reg[0x007]=0x003d
[dp83811] MMD1_Reg[0x00b]=0x0800
[dp83811] MMD1_Reg[0x012]=0x0001
[dp83811] MMD1_Reg[0x834]=0xc000
[dp83811] MMD1_Reg[0x836]=0x0000