SGMII调试及丢包问题

Dear 丶 2023-02-17 03:14 24阅读 0赞

使用88E1514和FPGA连接做以太网通信，走的是LVDS接口

ip核使用:GMII转SGMII的桥，使用了***同步SGMII模式***，需要提供一路125MHz的同步时钟，并固定在1G模式。

![20200611174228586.png][]

![20200611174215889.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70][]![2020061117414777.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 2][]

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1、外部时钟使用GC管脚，可以**直接给到MMCM/PLL**，无需加BUFG会引入零点几纳秒的延时

默认我们认为clk和data是对齐的，所以一般要使用MMCM的对齐功能，即***输入时钟和输出时钟同相位***。MMCM实现对齐的方式是在fbclk上插入了一个bufg,在例化代码可以看到：

![20200611173209379.png][]

2、修改了xiliinx ip核源文件：（使用了最低抖动，默认是OPTIMIZED）

![20200611173252666.png][]

3、SGMII的PHY是CML电路，和FPGA LVDS端接时，FPGA输出需要使用交流耦合，一般串一个0.1~0.01uF/25V的

电容，FPGA输入可以直接耦合（也可以交流耦合），但注意***不要使用外部终端电阻，使用FPGA内部电阻*。**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 4][]

4、clock\_delay\_group约束

![20200611175751280.png][]

![20200611180022471.png][]

5、修改差分输入为单端时钟输入：

【***虽然ip核文件不支持修改，但可以使用其它编辑器打开，在vivado外面修改，修改后在ip核重新生成的过程中替换上去即可(更好的办法是将ip生成设置为global模式，这样***

***外部修改源文件后会同步重新综合)***】

gig\_ethernet\_pcs\_pma\_0\_sgmii\_phy\_clk\_gen.v

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 5][]

![20200611175303363.png][]

参考:

pg047-gig-eth-pcs-pma.pdf

Alaska®  
88E1510/88E1518/  
88E1512/88E1514  
Integrated 10/100/1000 Mbps  
Energy Efficient Ethernet  
Transceiver

其它：

[https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841604/KCU105+SGMII+over+LVDS+design+creation+using+board+flow][https_xilinx-wiki.atlassian.net_wiki_spaces_A_pages_18841604_KCU105_SGMII_over_LVDS_design_creation_using_board_flow]

[https://mindchasers.com/dev/hw-sgmii-review //][https_mindchasers.com_dev_hw-sgmii-review]***借助示波器和实验台示例回顾了一些SGMII核心概念***

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 6][]

//-----------------------------------------------------------------------------------------------------------------------------------------------------------

追记：sgmii用于serdes调试

SGMII属于serdes通信，理论上应该不关心相位，但是频率的误差需要控制在200ppm以内，最好的电路模式应该使用

同源时钟。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 7][]

问题1：txoutclk是怎么产生的？为什么不同模块要共用userclk/2时钟，从自己的txoutclk产生不可以吗？

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基于rtl8211fs sgmii调试：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 8][]

使用gt生成example可以直接抓取相应的1.25Gbps的数据码：根据8/10b可以翻译对应的数据，以及当前自动协商的状态:idel/data/configure

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 9][]

![20201112180833193.png][]

![2020111218084172.png][]

![20201112181008624.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 10][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 11][]

sgmii数据格式说明：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 12][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 13][]

ip核配置需要开启自动协商：配置参考

![202011121800370.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 14][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 15][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 16][]

![20201112180158284.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 17][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 18][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 19][]

自动协商过程：参考part4,见附

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 20][]

以及pg047：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 21][]

参考：

[https://media.digikey.com/pdf/data%20sheets/csr%20pdfs/ar8031\_ds\_(atheros)\_rev1.0\_aug2011.pdf][https_media.digikey.com_pdf_data_20sheets_csr_20pdfs_ar8031_ds_atheros_rev1.0_aug2011.pdf]

8b/10b参考xilinx文件附录：

[https://www.xilinx.com/support/documentation/user\_guides/ug576-ultrascale-gth-transceivers.pdf][https_www.xilinx.com_support_documentation_user_guides_ug576-ultrascale-gth-transceivers.pdf]

以太网标准：

[https://ecfsapi.fcc.gov/file/1050839507018/IEEE%20Standard%20for%20Ethernet.pdf][https_ecfsapi.fcc.gov_file_1050839507018_IEEE_20Standard_20for_20Ethernet.pdf]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 22][]

[http://download.xskernel.org/docs/ieee/ieee%20802/802.3-2000\_part4.pdf][http_download.xskernel.org_docs_ieee_ieee_20802_802.3-2000_part4.pdf]

part3:

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 23][]

[https://opencores.org/websvn/filedetails?repname=1000base-x&path=%2F1000base-x%2Ftrunk%2Fdoc%2F802.3-2008\_section2.pdf&bcsi\_scan\_91c2e97ef32f18a3=V1Ygi7liGXdis80J3CYk1MUlxZsSAAAACY4+BA%3D%3D+][https_opencores.org_websvn_filedetails_repname_1000base-x_path_2F1000base-x_2Ftrunk_2Fdoc_2F802.3-2008_section2.pdf_bcsi_scan_91c2e97ef32f18a3_V1Ygi7liGXdis80J3CYk1MUlxZsSAAAACY4_BA_3D_3D]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 24][]

除了上面的802.3-2000 part4,pg047文档也详细描述了1000BASE-X的自动协商状态机：关于xmit三种工作状态：idel/data/configure

[https://www.xilinx.com/support/documentation/ip\_documentation/gig\_ethernet\_pcs\_pma/v16\_1/pg047-gig-eth-pcs-pma.pdf][https_www.xilinx.com_support_documentation_ip_documentation_gig_ethernet_pcs_pma_v16_1_pg047-gig-eth-pcs-pma.pdf]

opencores还有一个sgmii的ip可以参考：

[https://opencores.org/projects/sgmii][https_opencores.org_projects_sgmii]

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[20200611175303363.png]: https://img-blog.csdnimg.cn/20200611175303363.png
[https_xilinx-wiki.atlassian.net_wiki_spaces_A_pages_18841604_KCU105_SGMII_over_LVDS_design_creation_using_board_flow]: https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18841604/KCU105+SGMII+over+LVDS+design+creation+using+board+flow
[https_mindchasers.com_dev_hw-sgmii-review]: https://mindchasers.com/dev/hw-sgmii-review
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc_size_16_color_FFFFFF_t_70 21]: https://img-blog.csdnimg.cn/20201112180002899.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTEzMjk5Njc=,size_16,color_FFFFFF,t_70
[https_media.digikey.com_pdf_data_20sheets_csr_20pdfs_ar8031_ds_atheros_rev1.0_aug2011.pdf]: https://media.digikey.com/pdf/data%20sheets/csr%20pdfs/ar8031_ds_%28atheros%29_rev1.0_aug2011.pdf
[https_www.xilinx.com_support_documentation_user_guides_ug576-ultrascale-gth-transceivers.pdf]: https://www.xilinx.com/support/documentation/user_guides/ug576-ultrascale-gth-transceivers.pdf
[https_ecfsapi.fcc.gov_file_1050839507018_IEEE_20Standard_20for_20Ethernet.pdf]: https://ecfsapi.fcc.gov/file/1050839507018/IEEE%20Standard%20for%20Ethernet.pdf
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[http_download.xskernel.org_docs_ieee_ieee_20802_802.3-2000_part4.pdf]: http://download.xskernel.org/docs/ieee/ieee%20802/802.3-2000_part4.pdf
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[https_opencores.org_websvn_filedetails_repname_1000base-x_path_2F1000base-x_2Ftrunk_2Fdoc_2F802.3-2008_section2.pdf_bcsi_scan_91c2e97ef32f18a3_V1Ygi7liGXdis80J3CYk1MUlxZsSAAAACY4_BA_3D_3D]: https://opencores.org/websvn/filedetails?repname=1000base-x&path=%2F1000base-x%2Ftrunk%2Fdoc%2F802.3-2008_section2.pdf&bcsi_scan_91c2e97ef32f18a3=V1Ygi7liGXdis80J3CYk1MUlxZsSAAAACY4+BA%3D%3D+
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[https_www.xilinx.com_support_documentation_ip_documentation_gig_ethernet_pcs_pma_v16_1_pg047-gig-eth-pcs-pma.pdf]: https://www.xilinx.com/support/documentation/ip_documentation/gig_ethernet_pcs_pma/v16_1/pg047-gig-eth-pcs-pma.pdf
[https_opencores.org_projects_sgmii]: https://opencores.org/projects/sgmii