ds90ub936 error

Hi,

我们目前使用ds90ub936+ds90ub935搭建了一个多相机系统， 配置如下：

936：

1.外接两路FPDLINK输入

2.输出2×2 lanes， 2-vc, Replication mode， CSI-2 SYNCHRONOUS mode

原理图：

寄存器配置：

{0x01, 0x02}, {0xB3, 0x00}, /* BIST */
{0x1F, 0x00}, /* 1.6 Gbps csi clock per lane */
{0x33, 0x23}, /* 2 lane, continuous clock*/
{0x20, 0x00},
{0x21, 0x81},

/*RX port 0*/
{0x4C, 0x01},
{0x58, 0x5E},
{0x5C, (DS90UB935_CAM1_ADDR << 1)}, /* TI 935 alias address */
{0x5D, (SENSOR_ADDR << 1)}, 
{0x65, (CAM1_SENSOR_ADDR << 1)}, /* CAM alias address */
{0x72, 0xE8},
{0x0F, 0x7F}, 
{0x6E, 0x08},
{0x6F, 0x12}, 

/*RX port 1*/
{0x4C, 0x12},
{0x58, 0x5E},
{0x5C, (DS90UB935_CAM2_ADDR << 1)},
{0x5D, (SENSOR_ADDR << 1)},
{0x65, (CAM2_SENSOR_ADDR << 1)},
{0x72, 0xE9},
{0x0F, 0x7F}, 
{0x6E, 0x08}, 
{0x6F, 0x12}, 

935：

1.4-lanes CSI输入800M或者600M

原理图：

寄存器配置：

{DS90UB935_CAM1_ADDR, 0x01, 0x02},
{DS90UB935_CAM1_ADDR, 0x02, 0x73}, 
{DS90UB935_CAM1_ADDR, 0x0E, 0xF0}, 
{DS90UB935_CAM1_ADDR, 0x0D, 0x3C}, 

问题：

1.只streame on任意一路sensor， 另一路关闭， 主机可正常获取数据， 链路无错误，相关状态寄存器如下：

[ 145.477346] ds90ub936 30-0030: Dump rx0 936 status*******
[ 145.488881] ds90ub936 30-0030: reg[0x4d]=0x3
[ 145.500416] ds90ub936 30-0030: reg[0x4e]=0x4
[ 145.511937] ds90ub936 30-0030: reg[0x4f]=0x64
[ 145.523432] ds90ub936 30-0030: reg[0x50]=0x0
[ 145.534541] ds90ub936 30-0030: reg[0x54]=0x0
[ 145.546081] ds90ub936 30-0030: reg[0x55]=0x0
[ 145.558073] ds90ub936 30-0030: reg[0x56]=0x0
[ 145.569568] ds90ub936 30-0030: reg[0x57]=0x0
[ 145.581402] ds90ub936 30-0030: reg[0x73]=0x1
[ 145.592907] ds90ub936 30-0030: reg[0x74]=0xe0
[ 145.604435] ds90ub936 30-0030: reg[0x75]=0x3
[ 145.615930] ds90ub936 30-0030: reg[0x76]=0xc0
[ 145.627436] ds90ub936 30-0030: reg[0x7a]=0x0
[ 145.627446] ds90ub936 30-0030: Dump rx0 935 status*******
[ 145.638548] ds90ub936 30-0030: reg[0x54]=0x0
[ 145.650077] ds90ub936 30-0030: reg[0x55]=0x0
[ 145.661634] ds90ub936 30-0030: reg[0x56]=0x0
[ 145.673943] ds90ub936 30-0030: reg[0x5c]=0x0
[ 145.685644] ds90ub936 30-0030: reg[0x5d]=0x0
[ 145.697210] ds90ub936 30-0030: reg[0x5e]=0x0
[ 145.708731] ds90ub936 30-0030: reg[0x5f]=0x0
[ 145.720310] ds90ub936 30-0030: reg[0x60]=0x0
[ 145.731853] ds90ub936 30-0030: reg[0x61]=0x2c
[ 145.743360] ds90ub936 30-0030: reg[0x62]=0xc0
[ 145.754537] ds90ub936 30-0030: reg[0x63]=0x3
[ 145.766041] ds90ub936 30-0030: reg[0x64]=0x13

2.当同时streame on两路sensor， 链路出错，主机端丢帧或无法拿到一帧完整图像，相关状态寄存器如下：

[ 380.717639] ds90ub936 30-0030: Dump rx1 936 status*******
[ 380.729222] ds90ub936 30-0030: reg[0x4d]=0x53
[ 380.740807] ds90ub936 30-0030: reg[0x4e]=0x7d
[ 380.752387] ds90ub936 30-0030: reg[0x4f]=0x64
[ 380.763933] ds90ub936 30-0030: reg[0x50]=0x0
[ 380.775511] ds90ub936 30-0030: reg[0x54]=0x0
[ 380.787087] ds90ub936 30-0030: reg[0x55]=0x0
[ 380.798651] ds90ub936 30-0030: reg[0x56]=0x0
[ 380.810214] ds90ub936 30-0030: reg[0x57]=0x0
[ 380.822138] ds90ub936 30-0030: reg[0x73]=0x1
[ 380.834316] ds90ub936 30-0030: reg[0x74]=0xe0
[ 380.846143] ds90ub936 30-0030: reg[0x75]=0x3
[ 380.858186] ds90ub936 30-0030: reg[0x76]=0xc0
[ 380.870133] ds90ub936 30-0030: reg[0x7a]=0xf
[ 380.870143] ds90ub936 30-0030: Dump rx1 935 status*******
[ 380.881722] ds90ub936 30-0030: reg[0x54]=0x0
[ 380.894371] ds90ub936 30-0030: reg[0x55]=0x83
[ 380.906122] ds90ub936 30-0030: reg[0x56]=0x10
[ 380.917700] ds90ub936 30-0030: reg[0x5c]=0x0
[ 380.929963] ds90ub936 30-0030: reg[0x5d]=0x0
[ 380.941739] ds90ub936 30-0030: reg[0x5e]=0x0
[ 380.953856] ds90ub936 30-0030: reg[0x5f]=0x0
[ 380.965865] ds90ub936 30-0030: reg[0x60]=0x0
[ 380.977422] ds90ub936 30-0030: reg[0x61]=0x2c
[ 380.988977] ds90ub936 30-0030: reg[0x62]=0xc0
[ 381.000537] ds90ub936 30-0030: reg[0x63]=0x3
[ 381.012121] ds90ub936 30-0030: reg[0x64]=0x13

[ 381.028386] ds90ub936 30-0030: Dump rx0 936 status*******
[ 381.040007] ds90ub936 30-0030: reg[0x4d]=0x3
[ 381.051541] ds90ub936 30-0030: reg[0x4e]=0x14
[ 381.063064] ds90ub936 30-0030: reg[0x4f]=0x64
[ 381.074565] ds90ub936 30-0030: reg[0x50]=0x0
[ 381.086113] ds90ub936 30-0030: reg[0x54]=0x0
[ 381.097682] ds90ub936 30-0030: reg[0x55]=0x0
[ 381.109320] ds90ub936 30-0030: reg[0x56]=0x0
[ 381.120973] ds90ub936 30-0030: reg[0x57]=0x0
[ 381.132532] ds90ub936 30-0030: reg[0x73]=0x1
[ 381.144060] ds90ub936 30-0030: reg[0x74]=0xe0
[ 381.155595] ds90ub936 30-0030: reg[0x75]=0x3
[ 381.167171] ds90ub936 30-0030: reg[0x76]=0xc0
[ 381.178544] ds90ub936 30-0030: reg[0x7a]=0x0
[ 381.178554] ds90ub936 30-0030: Dump rx0 935 status*******
[ 381.190095] ds90ub936 30-0030: reg[0x54]=0x0
[ 381.202206] ds90ub936 30-0030: reg[0x55]=0x0
[ 381.213830] ds90ub936 30-0030: reg[0x56]=0x0
[ 381.225455] ds90ub936 30-0030: reg[0x5c]=0x0
[ 381.236986] ds90ub936 30-0030: reg[0x5d]=0x0
[ 381.248502] ds90ub936 30-0030: reg[0x5e]=0x0
[ 381.260018] ds90ub936 30-0030: reg[0x5f]=0x0
[ 381.271532] ds90ub936 30-0030: reg[0x60]=0x0
[ 381.283043] ds90ub936 30-0030: reg[0x61]=0x2c
[ 381.294597] ds90ub936 30-0030: reg[0x62]=0xc0
[ 381.306117] ds90ub936 30-0030: reg[0x63]=0x3
[ 381.318201] ds90ub936 30-0030: reg[0x64]=0x13

3.我们在另外一个项目中使用上述原理图，936只接一路输入，极容易出现不稳定情况，线长5m， poc网络有问题吗？

请各位帮忙指导下，谢谢！

thanks

Kailyn Chen：

您好，根据您的描述，需要和您确认下应用，您是DS90UB936+DS90UB935？ UB936的输入是外接LVDS 输入？ 然后UB936的输出接到UB935的输入？host和senfor分别在哪边？
另外，如果只接一路输入，不稳定， 看下cable 的阻抗，建议50-Ω single-ended coaxial 或者 100-Ω differential STP cables.
如果外接LVDS给936输入，也是要在靠近936的输入端需要端接100ohm匹配电阻。

clound liu：

回复 Kailyn Chen:

数据流：
2x( sensor==>935) ====>936