【TI FAE 分享】TI DP83848 在 DM81XX 平台上的使用

专家，您好，
    请问“TX/RX信号使用50 欧姆上拉”是指 TXD[0,1], RXD[0.1]需要上拉50欧姆的电阻吗？

你好，
  这里指的是 PHY与RJ45那边的RD+/-;TD+/-信号。

你好，Louis，
    以下这个连接器是必须的吗？

我目前遇到的问题如下：
I'm using rmii interface connected to the phy dp83848j. And i have got the id of dp83848j(the value is 0x80017) . 
After that ,  the Auto-Negotiation is Successful.  Transfer Mode : 100 Mbps Full Duplex.
PHY link verified for Port 1. 
But i can not ping the board from PC. 

I'm using static IP .
lwipIfPort1.ipAddr = 192<<24 |168<<16 | 1<<8 | 200; 
lwipIfPort1.netMask = 255<<24 |255<<16 | 255<<8 | 0; 
lwipIfPort1.gwAddr = 192<<24 |168<<16 | 1<<8 | 1;
lwipIfPort1.ipMode = IPADDR_USE_STATIC;

when i set（CONTROL_GMII_SEL = 0xC5;     // RMII1 clock sourced from pin， use RMII mode）,
I can test pad RXD_1, RXD_0 have 50MHz rate data infor.

The value of DP83848J's registers is as following:
i=0x0, data=0x3100 
i=0x1, data=0x786d 
i=0x2, data=0x2000 
i=0x3, data=0x5c90 
i=0x4, data=0x1e1 
i=0x5, data=0xc5e1 
i=0x6, data=0xd 
i=0x7, data=0x2801 
extended i=0x10, data=0x6e15 
extended i=0x11, data=0x0 
extended i=0x12, data=0x0 
extended i=0x13, data=0x0 
extended i=0x14, data=0x0 
extended i=0x15, data=0x0 
extended i=0x16, data=0x100 
extended i=0x17, data=0x21 
extended i=0x18, data=0x0 
extended i=0x19, data=0x8001 
extended i=0x1a, data=0x904 
extended i=0x1b, data=0x0 
extended i=0x1c, data=0x0 
extended i=0x1d, data=0x6011
I found that the value of the phy's register PHYSTS (addr:0x10) was 2e15 sometimes. That seems that AUTO-MDIX is not stable.But I can not ping the both case either.

烦请帮忙解决下这个问题。

我们用DM6467和DP83848I通信，配置成10M模式 ，就可以 通信，100M的就通信不了。网上还有其他人问DP83848 100M不通的问题，但不一定是跟DM系列的芯片一起使用。请问从哪里入手检查

请教您一下，开发板带着网线上电，读取的寄存器地址PHY_BMCR=0x1100，而不带网线就是0x3100，这是什么原因？不晓得Loopback这位是如何改变的。

MII接口初始化完成后打印寄存器的值应该是多少呢？谢谢

自问自答，今天ping通了。dp83848+MII+stm32f429
PHY_BCR = 1000
PHY_BSR = 786d
PHY_PHYIDR1 = 2000
PHY_PHYIDR2 = 5c90
PHY_ANAR = 1e1
PHY_ANLPAR = 4de1
PHY_ANER = 7
PHY_ANNPTR = 2801
PHY_PHYSTS = 615
PHY_RECR = 0
PHY_PCSR = 100
PHY_RBR = 1
PYH_LEDCR = 0
PYH_PHYCR = 21