DS250DF810: link could not establish

Andrew Su

Part Number: DS250DF810

dears,

My customer used DS250DF810 between the switch chip CTC7132 and the optical module. The hardware connection block diagram is as below:

The test environment: the optical port is self-looped through the optical fiber.

The register configuration is as below:

->retimer_bpo_cfg 10

->0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[0]: reg = 0xfc, value = 0x1

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[1]: reg = 0xff, value = 0x3

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[2]: reg = 0x0, value = 0x4

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[3]: reg = 0xa, value = 0xc

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[4]: reg = 0x60, value = 0x27

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[5]: reg = 0x61, value = 0xb1

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[6]: reg = 0x62, value = 0x27

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[7]: reg = 0x63, value = 0xb1

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[8]: reg = 0x64, value = 0xff

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[9]: reg = 0x9, value = 0x4

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[10]: reg = 0x18, value = 0x10

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[11]: reg = 0x31, value = 0x40

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[12]: reg = 0x1e, value = 0xe3

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[13]: reg = 0x3d, value = 0x9a

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[14]: reg = 0x3f, value = 0x40

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[15]: reg = 0x3e, value = 0x40

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[16]: reg = 0x3d, value = 0x8d

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[17]: reg = 0x3f, value = 0x42

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[18]: reg = 0x3e, value = 0x41

0xffffffff (ShadowTask):1970-01-01 02:37:55<interrupt>[-1]: TEST -MAJOR set array[19]: reg = 0xa, value = 0x0

value = 0 = 0x0

the DF810 chip ID is read normally, the value of the 0x78 register is read as 0x20, the value of the 0x27 and 28 registers is read as 0x0, and the switch main chip feedback that the LINK to the optical module is not establish. the issue occurs after the CTC7132 and retimer are configured.

the customer used DS250DF810 previously and it may work normally. the issue happens after change the switch chip to CTC7132 (there is no any other change). The switching chip has been configured normally. The customer use the DS250DF810 configuration file of the previous mass-produced project. the register of DF810 is attached below:

全屏 channel0_default-10-reread.txt 下载

dd_retimer_readall_debug 0
0xffffffff (ShadowTask):Global{Reg,Value}:  {0xef,0xc}  {0xf0,0x32}  {0xf1,0x10}  {0xf3,0x0}  {0xfb,0x4} {0xfc,0x0} {0xfd,0x0} {0xfe,0x3} {0xff,0x0}
0xffffffff (ShadowTask):select Share Quad1, set {0xff,0x20}
0xffffffff (ShadowTask):Share Quad1{Reg,Value}:  {0x0,0x0}  {0x1,0x50}  {0x2,0x0}  {0x3,0x0}  {0x4,0x9} {0x5,0x1} {0x6,0x0} {0x8,0x0} {0xa,0x0}  {0xb,0x40}  {0xc,0x0}  {0xd,0x42}  {0xe,0x3}  {0xf,0x0} {0x10,0xff} {0x11,0x0} {0x12,0x91}
0xffffffff (ShadowTask):select Share Quad0, set {0xff,0x10}
0xffffffff (ShadowTask):Share Quad0{Reg,Value}:  {0x0,0x0}  {0x1,0x50}  {0x2,0x0}  {0x3,0x0}  {0x4,0x9} {0x5,0x1} {0x6,0x0} {0x8,0x0} {0xa,0x0}  {0xb,0x40}  {0xc,0x0}  {0xd,0xb4}  {0xe,0x1}  {0xf,0x0} {0x10,0xff} {0x11,0x0} {0x12,0x91}
0xffffffff (ShadowTask):select channel[0], set {0xfc,0x1} {0xff,0x01}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x0,0x0} {0x1,0x80} {0x2,0x1}  {0x3,0x0} {0x4,0x1} {0x5,0x1} {0x6,0x1} {0x7,0x1}   {0x8,0x73} {0x9,0x0} {0xa,0x0} {0xb,0x63} {0xc,0x0} {0xd,0x80} {0xe,0x93} {0xf,0x69}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x10,0x0} {0x11,0x20} {0x12,0x83}  {0x13,0xb0} {0x14,0x4} {0x15,0x10} {0x16,0x7a} {0x17,0x36}   {0x18,0x40} {0x19,0x20} {0x1a,0x58} {0x1b,0x3} {0x1c,0x90} {0x1d,0x0} {0x1e,0xe9} {0x1f,0xb}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x20,0x0} {0x21,0x0} {0x22,0x0}  {0x23,0x40} {0x24,0x40} {0x25,0x0} {0x26,0x0} {0x27,0x0}   {0x28,0x0} {0x29,0x3} {0x2a,0x5a} {0x2b,0xa} {0x2c,0xf6} {0x2d,0x30} {0x2e,0x0} {0x2f,0x54}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x30,0x0} {0x31,0x20} {0x32,0x11}  {0x33,0x88} {0x34,0xbf} {0x35,0xf} {0x36,0x30} {0x37,0x5}   {0x38,0x0} {0x39,0x60} {0x3a,0x0} {0x3b,0x3f} {0x3c,0x6b} {0x3d,0x1a} {0x3e,0x40} {0x3f,0x40}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x40,0x0} {0x41,0x40} {0x42,0x50}  {0x43,0x80} {0x44,0x90} {0x45,0xc0} {0x46,0xd0} {0x47,0xd1}   {0x48,0xd5} {0x49,0xd8} {0x4a,0xea} {0x4b,0xf7} {0x4c,0xfd} {0x4d,0xee} {0x4e,0xef} {0x4f,0xff}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x50,0x0} {0x51,0x0} {0x52,0x0}  {0x53,0x0} {0x54,0x0} {0x55,0x0} {0x56,0x0} {0x57,0x0}   {0x58,0x0} {0x59,0x0} {0x5a,0x0} {0x5b,0x0} {0x5c,0x0} {0x5d,0x0} {0x5e,0x0} {0x5f,0x0}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x60,0x0} {0x61,0x0} {0x62,0x0}  {0x63,0x0} {0x64,0x0} {0x65,0x0} {0x66,0x0} {0x67,0x20}   {0x68,0x0} {0x69,0xa} {0x6a,0x21} {0x6b,0x40} {0x6c,0x0} {0x6d,0x0} {0x6e,0x0} {0x6f,0x0}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x70,0x5} {0x71,0x23} {0x72,0x0}  {0x73,0x0} {0x74,0x0} {0x75,0x0} {0x76,0x21} {0x77,0x1a}   {0x78,0x20} {0x79,0x10} {0x7a,0x0} {0x7b,0x0} {0x7c,0x0} {0x7d,0x48} {0x7e,0x13} {0x7f,0x2a}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x80,0x0} {0x81,0xe5} {0x82,0x0}  {0x83,0x1} {0x84,0x0} {0x85,0x0} {0x86,0x0} {0x87,0x0}   {0x88,0x0} {0x89,0x0} {0x8a,0x0} {0x8b,0x0} {0x8c,0x0} {0x8d,0x0} {0x8e,0x0} {0x8f,0x0}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x90,0x0} {0x91,0x0} {0x92,0x0}  {0x93,0x0} {0x94,0x0} {0x95,0x0} {0x96,0x8} {0x97,0xff}   {0x98,0x0} {0x99,0x3f} {0x9a,0x3f} {0x9b,0xe0} {0x9c,0x24} {0x9d,0xa5} {0x9e,0x48} {0x9f,0x0}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0xa0,0x0} {0xa1,0x40} {0xa2,0x50}  {0xa3,0x80} {0xa4,0x90} {0xa5,0x20} {0xa6,0x43} {0xa7,0xdf}   {0xa8,0x0} {0xa9,0x0}
value = 0 = 0x0


retimer_sct_cfg 0,10
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[0]: reg = 0xff, value = 0x1
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[0]: reg = 0xfc, value = 0x1
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[0]: reg = 0xff, value = 0x1
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[1]: reg = 0xfc, value = 0x1
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[2]: reg = 0x0, value = 0x4
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[3]: reg = 0xa, value = 0xc
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[4]: reg = 0x60, value = 0x90
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[5]: reg = 0x61, value = 0xb3
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[6]: reg = 0x62, value = 0x90
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[7]: reg = 0x63, value = 0xb3
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[8]: reg = 0x64, value = 0xff
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[9]: reg = 0x9, value = 0x4
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[10]: reg = 0x18, value = 0x10
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[11]: reg = 0x31, value = 0x40
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[12]: reg = 0x1e, value = 0xe3
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[13]: reg = 0x3d, value = 0x9a
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[14]: reg = 0x3d, value = 0x9a
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[15]: reg = 0x3f, value = 0x40
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[16]: reg = 0x3e, value = 0x40
0xffffffff (ShadowTask):1970-01-01 00:08:07<interrupt>[-1]: TEST           -MAJOR        set array[17]: reg = 0x3d, value = 0x8a
0xffffffff (ShadowTask):1970-01-01 00:08:08<interrupt>[-1]: TEST           -MAJOR        set array[18]: reg = 0x3f, value = 0x41
0xffffffff (ShadowTask):1970-01-01 00:08:08<interrupt>[-1]: TEST           -MAJOR        set array[19]: reg = 0x3e, value = 0x41
0xffffffff (ShadowTask):1970-01-01 00:08:08<interrupt>[-1]: TEST           -MAJOR        set array[20]: reg = 0xa, value = 0x0
value = 0 = 0x0

->
->
->dd_retimer_readall_debug 0
->0xffffffff (ShadowTask):Global{Reg,Value}:  {0xef,0xc}  {0xf0,0x32}  {0xf1,0x10}  {0xf3,0x0}  {0xfb,0x4} {0xfc,0x1} {0xfd,0x0} {0xfe,0x3} {0xff,0x1}
0xffffffff (ShadowTask):select Share Quad1, set {0xff,0x20}
0xffffffff (ShadowTask):Share Quad1{Reg,Value}:  {0x0,0x0}  {0x1,0x50}  {0x2,0x0}  {0x3,0x0}  {0x4,0x9} {0x5,0x1} {0x6,0x0} {0x8,0x0} {0xa,0x0}  {0xb,0x40}  {0xc,0x0}  {0xd,0x42}  {0xe,0x3}  {0xf,0x0} {0x10,0xff} {0x11,0x0} {0x12,0x91}
0xffffffff (ShadowTask):select Share Quad0, set {0xff,0x10}
0xffffffff (ShadowTask):Share Quad0{Reg,Value}:  {0x0,0x0}  {0x1,0x50}  {0x2,0x0}  {0x3,0x0}  {0x4,0x9} {0x5,0x1} {0x6,0x0} {0x8,0x0} {0xa,0x0}  {0xb,0x40}  {0xc,0x0}  {0xd,0xb4}  {0xe,0x1}  {0xf,0x0} {0x10,0xff} {0x11,0x0} {0x12,0x91}
0xffffffff (ShadowTask):select channel[0], set {0xfc,0x1} {0xff,0x01}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x0,0x0} {0x1,0x80} {0x2,0x0}  {0x3,0x0} {0x4,0x1} {0x5,0x1} {0x6,0x1} {0x7,0x1}   {0x8,0x73} {0x9,0x4} {0xa,0x0} {0xb,0x63} {0xc,0x0} {0xd,0x80} {0xe,0x93} {0xf,0x69}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x10,0x0} {0x11,0x20} {0x12,0x83}  {0x13,0xb0} {0x14,0x4} {0x15,0x10} {0x16,0x7a} {0x17,0x36}   {0x18,0x10} {0x19,0x20} {0x1a,0x58} {0x1b,0x3} {0x1c,0x90} {0x1d,0x0} {0x1e,0xe3} {0x1f,0xb}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x20,0x0} {0x21,0x0} {0x22,0x0}  {0x23,0x40} {0x24,0x40} {0x25,0x0} {0x26,0x0} {0x27,0x0}   {0x28,0x0} {0x29,0x3} {0x2a,0x5a} {0x2b,0xa} {0x2c,0xf6} {0x2d,0x30} {0x2e,0x0} {0x2f,0x54}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x30,0x0} {0x31,0x40} {0x32,0x11}  {0x33,0x88} {0x34,0xbf} {0x35,0xf} {0x36,0x30} {0x37,0x9}   {0x38,0x0} {0x39,0x60} {0x3a,0x0} {0x3b,0x32} {0x3c,0xe6} {0x3d,0x8a} {0x3e,0x41} {0x3f,0x41}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x40,0x0} {0x41,0x40} {0x42,0x50}  {0x43,0x80} {0x44,0x90} {0x45,0xc0} {0x46,0xd0} {0x47,0xd1}   {0x48,0xd5} {0x49,0xd8} {0x4a,0xea} {0x4b,0xf7} {0x4c,0xfd} {0x4d,0xee} {0x4e,0xef} {0x4f,0xff}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x50,0x0} {0x51,0x0} {0x52,0x0}  {0x53,0x0} {0x54,0x0} {0x55,0x0} {0x56,0x0} {0x57,0x0}   {0x58,0x0} {0x59,0x0} {0x5a,0x0} {0x5b,0x0} {0x5c,0x0} {0x5d,0x0} {0x5e,0x0} {0x5f,0x0}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x60,0x90} {0x61,0xb3} {0x62,0x90}  {0x63,0xb3} {0x64,0xff} {0x65,0x0} {0x66,0x0} {0x67,0x20}   {0x68,0x0} {0x69,0xa} {0x6a,0x21} {0x6b,0x40} {0x6c,0x0} {0x6d,0x0} {0x6e,0x0} {0x6f,0x0}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x70,0x5} {0x71,0x23} {0x72,0x0}  {0x73,0x0} {0x74,0x0} {0x75,0x0} {0x76,0x21} {0x77,0x1a}   {0x78,0x20} {0x79,0x10} {0x7a,0x0} {0x7b,0x0} {0x7c,0x0} {0x7d,0x48} {0x7e,0x13} {0x7f,0x2a}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x80,0x0} {0x81,0xe5} {0x82,0x0}  {0x83,0x1} {0x84,0x0} {0x85,0x0} {0x86,0x0} {0x87,0x0}   {0x88,0x0} {0x89,0x0} {0x8a,0x0} {0x8b,0x0} {0x8c,0x0} {0x8d,0x0} {0x8e,0x0} {0x8f,0x90}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0x90,0x0} {0x91,0x0} {0x92,0x0}  {0x93,0x0} {0x94,0x0} {0x95,0x0} {0x96,0x8} {0x97,0xff}   {0x98,0x0} {0x99,0x3f} {0x9a,0x3f} {0x9b,0xe0} {0x9c,0x24} {0x9d,0xa5} {0x9e,0x48} {0x9f,0x0}
0xffffffff (ShadowTask):Channel{Reg,Value}:  {0xa0,0x0} {0xa1,0x40} {0xa2,0x50}  {0xa3,0x80} {0xa4,0x90} {0xa5,0x20} {0xa6,0x43} {0xa7,0xdf}   {0xa8,0x0} {0xa9,0x0}
value = 0 = 0x0

if bypass CDR after writing the registers of retimer, the port connected to the 4 optical ports can be Linked up with CTC7132.

would you please help to guide the customer how to resolve the issue?

thnaks a lot!

5 个月前

0 Links 5 个月前

TI__Mastermind 30470 points

Hello!

We have received your case and the investigation will take some time. Thank you for your patience.

0 Taylor 4 个月前回复 Links

TI__Mastermind 34565 points

由于之前使用DS250DF810是正常的，但在更换交换芯片到CTC7132后出现问题，所以问题大概率出在CTC7132上。

但CTC7132并不是TI产品，所以最好咨询一下对应厂家。

一般来讲，可以验证CTC7132的输出信号特性，使用示波器测量信号，确认幅度、抖动等是否正常

0 hongfeng zhu 4 个月前回复 Taylor

Prodigy 60 points

你好，感谢你的回复，这个案子，我还有以下三个问题：

1、0x78寄存器读出来一直是0x20,这个正常吗？按照zhca900文档，一直无法读去眼图状态，这个是什么原因导致的？

2、bypass CDR 10G可以正常与CTC7132 Link，切换为25G时就不能Link。

3、0x2F寄存器的bit 4 5 6与速率具体对应关系是什么？有文档有具体的说明吗？

0 Taylor 4 个月前回复 hongfeng zhu

TI__Mastermind 34565 points

1.寄存器读取看起来是有问题的，无法读去眼图可能由于CDR配置错误导致。

2.还是与CTC7132的使用配置有关。

3.Programming Guide中有介绍，但是这个文档需要申请，我们这边暂时也没有，您可以申请一下。

0 hongfeng zhu 4 个月前回复 Taylor

Prodigy 60 points

我将retimer的8个通道均配置为10.3125G，以后，发现有4个通道(0 1 4 5)的CDR可以锁定（0x78为0x30），另外4个通道(2 3 6 7)的CDR不能锁定（0x78为0x20）。8个通道的连接方式如上图所示，请帮忙分析一下为什么这四个通道的CDR不能锁定。配置如下文：0xfc为寄存器地址，0x01为寄存器写入的数据。其它的类同。此时光模块都换成10G了，CTC7132也配置成了10G模式。

fdd_hal_iic_write_debug 0xf,0xfc,0x01,1
fdd_hal_iic_write_debug 0xf,0xff,0x03,1
fdd_hal_iic_write_debug 0xf,0x0a,0x0c,1
fdd_hal_iic_write_debug 0xf,0x2f,0x04,1
fdd_hal_iic_write_debug 0xf,0x31,0x40,1
fdd_hal_iic_write_debug 0xf,0x1e,0xe3,1
fdd_hal_iic_write_debug 0xf,0x3d,0x8a,1
fdd_hal_iic_write_debug 0xf,0x3e,0x40,1
fdd_hal_iic_write_debug 0xf,0x3f,0x40,1
fdd_hal_iic_write_debug 0xf,0x0a,0x00,1

0 Taylor 4 个月前回复 hongfeng zhu

TI__Mastermind 34565 points

四个失效通道可能分布在不同的物理位置，PCB走线、阻抗匹配或串扰等可能影响这些通道。

0 hongfeng zhu 4 个月前回复 Taylor

Prodigy 60 points

1、这个四个通道，把CDR bypas，在光口处自环，25G速率 12H PRBS31测试无误码，说明硬件链路是正常的。还有其它的排查方向吗？

2、DS250DF810的环回，只能相邻的两个通道之间做环回吗？看我的示意图，能把TX3换回到RX7吗？

3、CDR不能锁定，是RX侧的问题，还是RX和TX侧都有问题？

0 Taylor 4 个月前回复 hongfeng zhu

TI__Mastermind 34565 points

基本上能考虑到的已经都在上面讲了。

其他问题不好判断。

另外，CTC7132的使用配置也请检查。

0 hongfeng zhu 4 个月前回复 Taylor

Prodigy 60 points

3、CDR不能锁定，是retimer RX侧的问题，还是retimerRX和TX侧都有问题？

0 Taylor 4 个月前回复 hongfeng zhu

TI__Mastermind 34565 points

RX侧信号问题会导致CDR无法锁定。但TX配置错误也不能排除。

0 Andrew Su 4 个月前回复 Taylor

TI__Intellectual 1000 points

dear Taylor,

根据客户的具体配置等信息，可以初步判断造成CDR无法锁定的具体的一些可能的原因吗？

RX侧的信号要如何确定符合要求？有具体的测试方法吗？客户提到“这个四个通道，把CDR bypass，在光口处自环，25G速率 12H PRBS31测试无误码“，是否能说明硬件链路与信号质量是正常的？

是否能通过客户提供的配置数据查找可能的配置错误？需要调整哪些配置参数呢？

客户项目比较紧急，请帮忙看看要怎么才能解决这个问题。

谢谢！

0 Taylor 4 个月前回复 Andrew Su

TI__Mastermind 34565 points

看起来重定时器在当前配置下没有获得CDR锁定。

如果我的反向计算正确，他们将VCO设置为19.6 GHz的值，这超出了VCO的范围。然后，他们将分频器设置为除以2，因此这将支持9.8 Gbps。这不在此设备的CDR锁定范围内。

对于10 Gbps的应用程序，我建议保留0x60-0x63=0，并设置0x2F=0x04。

对于25 Gbps的应用程序，我建议保留0x60-0x63=0，并设置0x2F=0x54。

0 hongfeng zhu 4 个月前回复 Taylor

Prodigy 60 points

感谢大家，修改了对端的时钟，现在CDR正常锁定了，CTC7132发过来的25G信号，怎么通过在retimer测量，计算链路的插损呢？

0 Taylor 4 个月前回复 hongfeng zhu

TI__Mastermind 34565 points

重定时器不执行插入损耗计算。

您可以根据重定时器适应的CTLE值非常粗略地估计插损。通常，可以使用PCB材料参数和迹线长度来模拟或计算插损。

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