{"id":97915,"date":"2026-08-30T18:26:18","date_gmt":"2026-08-30T10:26:18","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/97915.html"},"modified":"2026-08-30T18:26:18","modified_gmt":"2026-08-30T10:26:18","slug":"fpga-serdes-%e9%80%9a%e7%94%a8%e5%9f%ba%e7%a1%80%ef%bc%88%e5%8d%81%e4%ba%8c%ef%bc%89rx-cdr%ef%bc%9a%e9%89%b4%e7%9b%b8%e4%b8%8e%e6%81%a2%e5%a4%8d%e6%97%b6%e9%92%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/97915.html","title":{"rendered":"FPGA SERDES \u901a\u7528\u57fa\u7840\uff08\u5341\u4e8c\uff09RX CDR\uff1a\u9274\u76f8\u4e0e\u6062\u590d\u65f6\u949f"},"content":{"rendered":"

\u9ad8\u901f\u4e32\u884c\u94fe\u8def\u53ea\u4f20\u8f93\u4e32\u884c\u6570\u636e，\u4e0d\u4f1a\u989d\u5916\u4f20\u8f93\u4e00\u6761\u4e0e\u6bcf\u4e2a\u6bd4\u7279\u540c\u6b65\u7684\u91c7\u6837\u65f6\u949f\u3002RX \u53ef\u4ee5\u7531\u672c\u5730\u53c2\u8003\u65f6\u949f\u548c PLL \u5efa\u7acb\u6ee1\u8db3\u7ebf\u8def\u901f\u7387\u8981\u6c42\u7684\u9ad8\u901f\u65f6\u949f，\u4f46\u5982\u679c\u53d1\u9001\u7aef\u4e0e\u63a5\u6536\u7aef\u4f7f\u7528\u5404\u81ea\u7684\u65f6\u949f\u6e90，\u4e24\u8005\u4e4b\u95f4\u6ca1\u6709\u56fa\u5b9a\u7684\u76f8\u4f4d\u5173\u7cfb，\u4e5f\u53ef\u80fd\u5b58\u5728\u5fae\u5c0f\u7684\u9891\u7387\u504f\u5dee\u3002\u56e0\u6b64，\u672c\u5730\u751f\u6210\u7684\u9ad8\u901f\u65f6\u949f\u867d\u7136\u9891\u7387\u6ee1\u8db3\u8981\u6c42，\u5176\u8fb9\u6cbf\u5374\u4e0d\u4e00\u5b9a\u843d\u5728\u5408\u9002\u7684\u91c7\u6837\u4f4d\u7f6e，\u4e0d\u80fd\u76f4\u63a5\u7528\u4e8e\u53ef\u9760\u7684\u6570\u636e\u5224\u51b3\u3002<\/p>\n

RX CDR \u7684\u4f5c\u7528\u662f\u4ece\u8f93\u5165\u6570\u636e\u7684\u8df3\u53d8\u4e2d\u83b7\u5f97\u76f8\u4f4d\u4fe1\u606f，\u5e76\u901a\u8fc7\u53cd\u9988\u73af\u8def\u4e0d\u65ad\u8c03\u6574\u91c7\u6837\u65f6\u949f\u3002\u8fb9\u6cbf\u91c7\u6837\u70b9\u9700\u8981\u8ddf\u968f\u6570\u636e\u8df3\u53d8，\u771f\u6b63\u7528\u4e8e\u5224\u51b3 0\/1 \u7684\u6570\u636e\u91c7\u6837\u70b9\u5219\u5e94\u4f4d\u4e8e\u76f8\u90bb\u8df3\u53d8\u4e4b\u95f4\u3002\u7ecf\u8fc7 CDR \u8c03\u6574\u540e\u7684\u6062\u590d\u65f6\u949f\u65e2\u7528\u4e8e\u4e32\u884c\u6570\u636e\u5224\u51b3，\u4e5f\u4e3a\u540e\u7eed\u4e32\u5e76\u8f6c\u6362\u548c\u5e76\u884c\u65f6\u949f\u5206\u9891\u63d0\u4f9b\u57fa\u7840\u3002\u672c\u6587\u4ece RX \u6570\u636e\u4e0e\u91c7\u6837\u65f6\u949f\u7684\u5173\u7cfb\u51fa\u53d1，\u4f9d\u6b21\u8bf4\u660e\u9274\u76f8\u3001\u76f8\u4f4d\u63d2\u503c\u3001\u8fde\u7eed\u8ddf\u8e2a\u4ee5\u53ca\u6062\u590d\u65f6\u949f\u7684\u5206\u9891\u8def\u5f84\u3002<\/p>\n

1. CDR \u5728 RX \u6570\u636e\u901a\u8def\u4e2d\u7684\u4f4d\u7f6e<\/h3>\n

RX CDR \u4f4d\u4e8e\u63a5\u6536\u6a21\u62df\u524d\u7aef\u4e4b\u540e\u3001SIPO \u4e4b\u524d\u3002RXP\/RXN \u8f93\u5165\u7ecf\u8fc7\u7aef\u63a5\u548c\u63a5\u6536\u5747\u8861\u540e，\u4ecd\u7136\u662f\u968f\u65f6\u95f4\u8fde\u7eed\u53d8\u5316\u7684\u9ad8\u901f\u6a21\u62df\u6ce2\u5f62；CDR \u5728\u8fd9\u4e00\u4f4d\u7f6e\u6062\u590d\u5e76\u8ddf\u8e2a\u91c7\u6837\u76f8\u4f4d，\u91c7\u6837\u5668\u5b8c\u6210 0\/1 \u5224\u51b3\u540e，\u6570\u636e\u518d\u8fdb\u5165\u4e32\u5e76\u8f6c\u6362\u548c RX PCS\u3002<\/p>\n

RXP\/RXN \u2192 RX \u6a21\u62df\u524d\u7aef\u4e0e\u5747\u8861 \u2192 RX CDR \u2192 SIPO \u2192 RX PCS \u2192 FPGA RX Interface
\n \u2502
\n \u2514\u2192 Recovered Clock<\/p>\n

\u8fd9\u4e00\u4f4d\u7f6e\u51b3\u5b9a\u4e86 CDR \u540c\u65f6\u8fde\u63a5\u4e24\u6761\u8def\u5f84\u3002\u6570\u636e\u8def\u5f84\u628a\u4e32\u884c\u6ce2\u5f62\u5224\u51b3\u4e3a 0\/1，\u5e76\u9001\u5f80 SIPO；\u65f6\u949f\u8def\u5f84\u5219\u4ea7\u751f\u4e0e\u8f93\u5165\u6570\u636e\u8fb9\u6cbf\u4fdd\u6301\u786e\u5b9a\u76f8\u4f4d\u5173\u7cfb\u7684 Recovered Clock（\u6062\u590d\u65f6\u949f），\u4f5c\u4e3a RX PMA \u4e32\u5e76\u8f6c\u6362\u548c\u540e\u7eed\u5e76\u884c\u5206\u9891\u7684\u65f6\u949f\u57fa\u7840\u3002<\/p>\n

CPLL\/QPLL \u4e0e CDR \u7684\u5206\u5de5\u4e5f\u9700\u8981\u5728\u8fd9\u91cc\u533a\u5206\u3002CPLL\/QPLL \u6839\u636e\u53c2\u8003\u65f6\u949f\u548c\u5206\u9891\u914d\u7f6e\u5efa\u7acb\u76ee\u6807\u7ebf\u8def\u901f\u7387\u6240\u9700\u7684\u9ad8\u901f\u57fa\u7840\u65f6\u949f，\u89e3\u51b3\u201c\u9891\u7387\u8303\u56f4\u662f\u5426\u6b63\u786e\u201d；CDR \u89c2\u5bdf\u5b9e\u9645\u8f93\u5165\u6570\u636e\u7684\u8fb9\u6cbf\u4f4d\u7f6e\u5e76\u8c03\u8282\u91c7\u6837\u76f8\u4f4d，\u89e3\u51b3\u201c\u5728\u4e00\u4e2a UI \u5185\u4f55\u65f6\u91c7\u6837\u201d\u3002\u56e0\u6b64，CPLL\/QPLL \u9501\u5b9a\u53ea\u80fd\u8bf4\u660e\u57fa\u7840\u65f6\u949f\u5df2\u7ecf\u5efa\u7acb，\u4e0d\u80fd\u76f4\u63a5\u8bc1\u660e\u63a5\u6536\u6570\u636e\u5df2\u7ecf\u88ab\u6b63\u786e\u91c7\u6837\u3002<\/p>\n

2. Bang-Bang \u9274\u76f8\u4e0e CDR \u95ed\u73af<\/h3>\n

RX CDR \u4f7f\u7528 Bang-Bang Phase Detector（BBPD） \u5224\u65ad\u8fb9\u6cbf\u91c7\u6837\u4f4d\u7f6e\u76f8\u5bf9\u6570\u636e\u8df3\u53d8\u662f\u504f\u65e9\u8fd8\u662f\u504f\u665a\u3002Bang-Bang \u6e90\u4e8e\u63a7\u5236\u7406\u8bba\u4e2d\u7684\u4e8c\u503c\u63a7\u5236：\u9274\u76f8\u5668\u53ea\u8f93\u51fa Early \u6216 Late \u4e24\u79cd\u65b9\u5411\u4fe1\u606f，\u4e0d\u7ed9\u51fa\u8fde\u7eed\u7684\u76f8\u4f4d\u8bef\u5dee\u5927\u5c0f\u3002\u8fd9\u91cc\u7684 Early\/Late \u8868\u793a\u91c7\u6837\u76f8\u4f4d\u504f\u65e9\u6216\u504f\u665a，\u4e0b\u6587\u5c06\u8fd9\u79cd\u5224\u51b3\u65b9\u5f0f\u7b80\u79f0\u4e3a Bang-Bang \u9274\u76f8\u3002<\/p>\n

\u5f53\u8fb9\u6cbf\u91c7\u6837\u70b9\u65e9\u4e8e\u6570\u636e\u8df3\u53d8\u65f6，\u9274\u76f8\u5668\u8f93\u51fa Early，CDR FSM \u63a7\u5236 Phase Interpolator \u5c06\u91c7\u6837\u76f8\u4f4d\u5411\u8f83\u665a\u65b9\u5411\u79fb\u52a8；\u91c7\u6837\u70b9\u665a\u4e8e\u6570\u636e\u8df3\u53d8\u65f6，\u5219\u8f93\u51fa Late，\u5e76\u5411\u8f83\u65e9\u65b9\u5411\u8c03\u6574\u3002\u6570\u636e\u6ca1\u6709\u53d1\u751f\u8df3\u53d8\u65f6，\u5f53\u524d\u6837\u672c\u4e0d\u80fd\u63d0\u4f9b\u65b0\u7684\u76f8\u4f4d\u65b9\u5411\u4fe1\u606f\u3002\u91c7\u6837\u76f8\u4f4d\u63a5\u8fd1\u6570\u636e\u8fb9\u6cbf\u540e，Early \u548c Late \u901a\u5e38\u4f1a\u4ea4\u66ff\u51fa\u73b0，\u76f8\u4f4d\u63d2\u503c\u5668\u56f4\u7ed5\u76ee\u6807\u4f4d\u7f6e\u8fdb\u884c\u5c0f\u8303\u56f4\u53cc\u5411\u4fee\u6b63\u3002<\/p>\n

<\/p>\n

\u56fe\u4e2d\u6570\u636e\u7531\u5de6\u5411\u53f3\u4f20\u8f93\u3002RXP\/RXN \u7ecf\u8fc7 Linear EQ \u548c DFE \u540e，\u540c\u65f6\u8fdb\u5165 Edge Sampler（\u4e5f\u79f0 Crossing Sampler）\u4e0e Data Sampler；CPLL\/QPLL \u7684\u8f93\u51fa\u4ece\u56fe\u4e0b\u65b9\u8fdb\u5165 Phase Interpolator，\u4e3a\u4e24\u7ec4\u91c7\u6837\u5668\u63d0\u4f9b\u53ef\u8c03\u76f8\u4f4d\u3002\u91c7\u6837\u7ed3\u679c\u7ecf DEMUX \u9001\u5165 CDR FSM，\u72b6\u6001\u673a\u518d\u63a7\u5236 PI(X) \u548c PI(D)，\u5f62\u6210\u95ed\u73af\u76f8\u4f4d\u8ddf\u8e2a\u3002<\/p>\n

UG476 \u5c06\u8be5\u7ed3\u6784\u79f0\u4e3a Phase-Rotator CDR\u3002Bang-Bang \u63cf\u8ff0\u9274\u76f8\u903b\u8f91\u53ea\u5224\u65ad\u8c03\u6574\u65b9\u5411，Phase-Rotator \u63cf\u8ff0\u76f8\u4f4d\u63d2\u503c\u5668\u6839\u636e\u5224\u51b3\u7ed3\u679c\u79fb\u52a8\u91c7\u6837\u76f8\u4f4d，\u4e24\u8005\u5206\u522b\u5bf9\u5e94\u95ed\u73af\u4e2d\u7684\u5224\u5b9a\u4e0e\u6267\u884c\u3002<\/p>\n

PLL \u63d0\u4f9b\u6ee1\u8db3\u7ebf\u8def\u901f\u7387\u8981\u6c42\u7684\u57fa\u7840\u65f6\u949f\u3002\u5b83\u51b3\u5b9a CDR \u4ece\u54ea\u4e2a\u9891\u7387\u9644\u8fd1\u5f00\u59cb\u5de5\u4f5c，\u4f46\u4e0d\u4f1a\u81ea\u52a8\u628a\u91c7\u6837\u8fb9\u6cbf\u653e\u5230\u8f93\u5165\u6570\u636e\u7684\u6b63\u786e\u4f4d\u7f6e\u3002<\/p>\n

PI(X) \u4e0e PI(D) \u662f\u4e24\u7ec4\u76f8\u4f4d\u63d2\u503c\u8def\u5f84\u3002Phase Interpolator \u5728 PLL \u8f93\u51fa\u76f8\u4f4d\u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u63d2\u503c，\u4f7f\u91c7\u6837\u76f8\u4f4d\u53ef\u4ee5\u6309\u8f83\u5c0f\u6b65\u8fdb\u5411\u524d\u6216\u5411\u540e\u79fb\u52a8\u3002PI(X) \u9a71\u52a8\u8fb9\u6cbf\u91c7\u6837\u8def\u5f84，PI(D) \u9a71\u52a8\u6570\u636e\u91c7\u6837\u8def\u5f84，\u4e24\u8005\u7531\u540c\u4e00\u4e2a CDR FSM \u534f\u8c03，\u5e76\u4fdd\u6301\u5bf9\u5e94\u7684\u76f8\u4f4d\u95f4\u9694\u3002<\/p>\n

Edge Sampler（Crossing Sampler） \u89c2\u5bdf\u6570\u636e\u8df3\u53d8\u9644\u8fd1\u7684\u7535\u5e73，\u7528\u4e8e\u5224\u65ad\u5f53\u524d\u91c7\u6837\u76f8\u4f4d\u76f8\u5bf9\u5b9e\u9645\u6570\u636e\u8fb9\u6cbf\u504f\u5411\u54ea\u4e00\u4fa7\u3002\u5b83\u63d0\u4f9b\u7684\u662f\u76f8\u4f4d\u8c03\u6574\u4f9d\u636e，\u4e0d\u76f4\u63a5\u4f5c\u4e3a\u6700\u7ec8\u63a5\u6536\u6570\u636e\u8f93\u51fa\u3002<\/p>\n

Data Sampler \u4f4d\u4e8e\u76f8\u90bb\u8fb9\u6cbf\u4e4b\u95f4，\u5b8c\u6210\u5b9e\u9645\u7684 0\/1 \u5224\u51b3\u3002\u5176\u8f93\u51fa\u4e00\u65b9\u9762\u9001\u5f80 RX DATA，\u53e6\u4e00\u65b9\u9762\u4e5f\u53c2\u4e0e CDR FSM \u7684\u76f8\u4f4d\u5224\u65ad\u3002\u72b6\u6001\u673a\u9700\u8981\u7ed3\u5408\u8fb9\u6cbf\u91c7\u6837\u4e0e\u6570\u636e\u91c7\u6837\u7ed3\u679c，\u624d\u80fd\u5224\u65ad\u5f53\u524d\u6570\u636e\u662f\u5426\u53d1\u751f\u8df3\u53d8\u4ee5\u53ca\u76f8\u4f4d\u5e94\u5411\u54ea\u4e2a\u65b9\u5411\u8c03\u6574\u3002<\/p>\n

CDR FSM \u6839\u636e\u8fde\u7eed\u7684 Data\/Edge \u6837\u672c\u5f62\u6210 Bang-Bang \u9274\u76f8\u7ed3\u679c，\u5e76\u63a7\u5236\u76f8\u4f4d\u63d2\u503c\u5668\u9010\u6b65\u4fee\u6b63\u91c7\u6837\u4f4d\u7f6e\u3002\u67d0\u4e00\u6b21\u5224\u65ad\u53ea\u7ed9\u51fa\u8c03\u6574\u65b9\u5411，\u4e0d\u7ed9\u51fa\u76f8\u4f4d\u8bef\u5dee\u5927\u5c0f；\u5b8c\u6574\u7684\u76f8\u4f4d\u8ddf\u8e2a\u5efa\u7acb\u5728\u540e\u7eed\u6570\u636e\u4e0d\u65ad\u63d0\u4f9b\u7684\u65b0\u5224\u51b3\u4e4b\u4e0a\u3002<\/p>\n

\u56fe\u4e2d\u7684 DEMUX \u8868\u660e，\u9ad8\u901f\u91c7\u6837\u7ed3\u679c\u4f1a\u5148\u8f6c\u6362\u4e3a\u8f83\u4f4e\u901f\u7387\u7684\u5e76\u884c\u6837\u672c，\u518d\u8fdb\u5165\u6570\u5b57 CDR \u72b6\u6001\u673a\u3002\u540e\u6587\u4f7f\u7528 D0\u3001E1\u3001D1 \u4e09\u4e2a\u70b9\u8bf4\u660e\u4e00\u6b21 Bang-Bang \u9274\u76f8，\u662f\u4e3a\u4e86\u4fbf\u4e8e\u7406\u89e3\u57fa\u672c\u5173\u7cfb；\u5728 GTX\/GTH \u786c\u6838\u5185\u90e8，\u72b6\u6001\u673a\u4f1a\u5bf9\u591a\u7ec4 Data\/Edge \u6837\u672c\u8fdb\u884c\u5e76\u884c\u5904\u7406\u3002\u5177\u4f53\u5e76\u884c\u5ea6\u3001\u5224\u51b3\u5904\u7406\u65b9\u5f0f\u548c\u6b65\u8fdb\u95e8\u9650\u5c5e\u4e8e\u5185\u90e8\u914d\u7f6e，UG476 \u4e0d\u5c55\u5f00\u8fd9\u4e9b\u5b9e\u73b0\u7ec6\u8282\u3002<\/p>\n

\u6cbf\u63a7\u5236\u65b9\u5411\u89c2\u5bdf，\u95ed\u73af\u5173\u7cfb\u53ef\u4ee5\u6982\u62ec\u4e3a：<\/p>\n

\u8f93\u5165\u6570\u636e\u8fb9\u6cbf \u2192 Data\/Edge Sampler \u2192 Bang-Bang \u9274\u76f8 \u2192 CDR FSM
\n \u2191 \u2502
\n \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 Phase Interpolator \u8c03\u6574\u540e\u7684\u91c7\u6837\u76f8\u4f4d \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

CDR \u7684\u8f93\u51fa\u4e0d\u662f\u4e00\u4e2a\u4e0e\u6570\u636e\u65e0\u5173\u7684\u81ea\u7531\u8fd0\u884c\u65f6\u949f，\u800c\u662f\u7ecf\u8fc7\u4e0a\u8ff0\u95ed\u73af\u6821\u6b63\u3001\u4e0e\u8f93\u5165\u6570\u636e\u4fdd\u6301\u76f8\u4f4d\u5173\u7cfb\u7684\u91c7\u6837\u65f6\u949f\u3002<\/p>\n

3. \u6839\u636e\u6570\u636e\u8df3\u53d8\u7406\u89e3 Bang-Bang \u9274\u76f8<\/h3>\n

<\/p>\n

\u56fe\u4e2d\u7684 E0\u3001E1\u3001E2 \u8868\u793a Edge Sampler \u7684\u91c7\u6837\u4f4d\u7f6e，\u4f4d\u4e8e\u76f8\u90bb UI \u7684\u4ea4\u754c\u5904；D0\u3001D1 \u8868\u793a Data Sampler \u7684\u91c7\u6837\u4f4d\u7f6e，\u4f4d\u4e8e\u4e24\u4e2a\u8fb9\u6cbf\u91c7\u6837\u70b9\u4e4b\u95f4\u3002UI（Unit Interval）\u662f\u4e00\u4e2a\u4e32\u884c\u6bd4\u7279\u5360\u7528\u7684\u65f6\u95f4，\u6570\u503c\u7b49\u4e8e\u7ebf\u8def\u901f\u7387\u7684\u5012\u6570\u3002<\/p>\n

\u4ee5 10 Gb\/s \u7ebf\u8def\u901f\u7387\u4e3a\u4f8b：<\/p>\n

TUI=110\u00a0Gb\/s=100\u00a0ps
\nT_{UI}=\\\\frac{1}{10\\\\ \\\\mathrm{Gb\/s}}=100\\\\ \\\\mathrm{ps}
\n<\/span><\/span>T<\/span><\/span>U<\/span>I<\/span><\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>=<\/span><\/span><\/span><\/span><\/span><\/span>10<\/span>\u00a0<\/span>Gb\/s<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>1<\/span><\/span><\/span><\/span>\u200b<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>=<\/span><\/span><\/span><\/span>100<\/span>\u00a0<\/span>ps<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

\u7406\u60f3\u60c5\u51b5\u4e0b，\u6570\u636e\u91c7\u6837\u70b9\u4f4d\u4e8e\u76f8\u90bb\u8fb9\u6cbf\u4e4b\u95f4，\u8ddd\u79bb\u524d\u540e\u8fb9\u6cbf\u5404\u7ea6\u534a\u4e2a UI，\u4e5f\u5c31\u662f\u7ea6 50 ps\u3002\u8fd9\u91cc\u7684\u534a\u4e2a UI \u8868\u793a\u4e24\u7c7b\u91c7\u6837\u4f4d\u7f6e\u7684\u76ee\u6807\u5173\u7cfb，\u5e76\u4e0d\u662f\u8981\u6c42\u8f93\u5165\u6ce2\u5f62\u6bcf\u6b21\u90fd\u5728\u5b8c\u5168\u76f8\u540c\u7684\u65f6\u523b\u8df3\u53d8\u3002<\/p>\n

Bang-Bang \u9274\u76f8\u53ef\u4ee5\u6cbf D0\u3001E1\u3001D1 \u4e09\u4e2a\u91c7\u6837\u70b9\u7406\u89e3\u3002D0 \u548c D1 \u662f\u76f8\u90bb\u7684\u6570\u636e\u6837\u672c，E1 \u662f\u4f4d\u4e8e\u4e24\u8005\u4e4b\u95f4\u7684\u8fb9\u6cbf\u6837\u672c；\u4e09\u8005\u6309\u7167 Data\u3001Edge\u3001Data \u7684\u987a\u5e8f\u6bcf\u9694\u534a\u4e2a UI \u91c7\u6837\u4e00\u6b21，\u5f62\u6210\u76f8\u5bf9\u4e8e\u7ebf\u8def\u6bd4\u7279\u7387\u7684\u4e8c\u500d\u8fc7\u91c7\u6837\u3002D0 \u4e0e D1 \u7528\u4e8e\u786e\u8ba4\u76f8\u90bb UI \u4e4b\u95f4\u662f\u5426\u51fa\u73b0\u6570\u636e\u8df3\u53d8，E1 \u5219\u7528\u4e8e\u5224\u65ad\u8fb9\u6cbf\u91c7\u6837\u70b9\u843d\u5728\u771f\u5b9e\u8df3\u53d8\u4e4b\u524d\u8fd8\u662f\u4e4b\u540e\u3002<\/p>\n

\u4e0b\u56fe\u4e0a\u534a\u90e8\u5206\u6309\u7167 E0\u3001D0\u3001E1\u3001D1\u3001E2 \u7684\u987a\u5e8f\u6807\u51fa\u4e8c\u500d\u8fc7\u91c7\u6837\u4f4d\u7f6e：E0\/E1\/E2 \u5bf9\u5e94\u6570\u636e\u8f68\u8ff9\u7684\u4ea4\u53c9\u70b9，D0\/D1 \u4f4d\u4e8e\u76f8\u90bb\u4ea4\u53c9\u70b9\u4e4b\u95f4\u3001\u773c\u5f00\u5ea6\u6700\u5927\u7684\u4e2d\u5fc3\u3002\u4e0b\u534a\u90e8\u5206\u518d\u4f7f\u7528 D0\u3001E1\u3001D1 \u5c55\u5f00\u56db\u79cd\u6709\u6548\u8df3\u53d8\u7ec4\u5408：<\/p>\n

<\/p>\n

\u5bf9\u4e8e 001 \u548c 110，E1 \u4ecd\u7136\u4fdd\u6301 D0 \u7684\u8df3\u53d8\u524d\u7535\u5e73，\u8bf4\u660e\u771f\u5b9e\u8df3\u53d8\u53d1\u751f\u5728 E1 \u4e0e D1 \u4e4b\u95f4\u3002\u6b64\u65f6\u8fb9\u6cbf\u91c7\u6837\u70b9\u4f4d\u4e8e\u771f\u5b9e\u8df3\u53d8\u4e4b\u524d，\u5224\u51b3\u4e3a Clock Early，PI \u9700\u8981\u628a\u91c7\u6837\u76f8\u4f4d\u5411\u8f83\u665a\u65b9\u5411\u79fb\u52a8\u3002<\/p>\n

\u5bf9\u4e8e 011 \u548c 100，E1 \u5df2\u7ecf\u53d8\u4e3a D1 \u7684\u8df3\u53d8\u540e\u7535\u5e73，\u8bf4\u660e\u771f\u5b9e\u8df3\u53d8\u53d1\u751f\u5728 D0 \u4e0e E1 \u4e4b\u95f4\u3002\u6b64\u65f6\u8fb9\u6cbf\u91c7\u6837\u70b9\u4f4d\u4e8e\u771f\u5b9e\u8df3\u53d8\u4e4b\u540e，\u5224\u51b3\u4e3a Clock Late，PI \u9700\u8981\u628a\u91c7\u6837\u76f8\u4f4d\u5411\u8f83\u65e9\u65b9\u5411\u79fb\u52a8\u3002\u4e0a\u5347\u6cbf\u4e0e\u4e0b\u964d\u6cbf\u7684\u7535\u5e73\u6781\u6027\u4e0d\u540c，\u4f46\u5224\u65ad\u4f9d\u636e\u76f8\u540c：E1 \u4e0e D0 \u76f8\u540c\u8868\u793a\u504f\u65e9，E1 \u4e0e D1 \u76f8\u540c\u8868\u793a\u504f\u665a\u3002<\/p>\n

\u624b\u7ed8\u56fe\u7528\u4e8e\u89c2\u5bdf\u56db\u79cd\u6709\u6548\u8df3\u53d8\u7684\u6ce2\u5f62\u5173\u7cfb，\u5b8c\u6574\u7684\u516b\u79cd\u91c7\u6837\u7ec4\u5408\u53ef\u7531\u4e0b\u8868\u67e5\u9605：<\/p>\n\nD0E1D1\u6570\u636e\u4e0e\u91c7\u6837\u5173\u7cfb\u9274\u76f8\u7ed3\u679cPI \u8c03\u6574\u65b9\u5411<\/tr>\n\n\n\n\n\n\n\n\n\n
0<\/td>\n0<\/td>\n0<\/td>\n\u4fdd\u6301\u4f4e\u7535\u5e73，\u65e0\u6570\u636e\u8df3\u53d8<\/td>\n\u65e0\u65b0\u7684\u76f8\u4f4d\u4fe1\u606f<\/td>\n\u4e0d\u8c03\u6574<\/td>\n<\/tr>\n
0<\/td>\n0<\/td>\n1<\/td>\n\u4e0a\u5347\u6cbf，E1 \u4ecd\u4e3a\u8df3\u53d8\u524d\u7535\u5e73<\/td>\n\u8fb9\u6cbf\u91c7\u6837\u76f8\u4f4d\u504f\u65e9（Early）<\/td>\n\u5411\u8f83\u665a\u65b9\u5411\u8c03\u6574<\/td>\n<\/tr>\n
0<\/td>\n1<\/td>\n0<\/td>\nD0\u3001D1 \u76f8\u540c\u800c E1 \u76f8\u53cd<\/td>\n\u65e0\u53ef\u9760\u9274\u76f8\u7ed3\u8bba<\/td>\n\u4e0d\u4f5c\u4e3a\u6709\u6548\u65b9\u5411<\/td>\n<\/tr>\n
0<\/td>\n1<\/td>\n1<\/td>\n\u4e0a\u5347\u6cbf，E1 \u5df2\u4e3a\u8df3\u53d8\u540e\u7535\u5e73<\/td>\n\u8fb9\u6cbf\u91c7\u6837\u76f8\u4f4d\u504f\u665a（Late）<\/td>\n\u5411\u8f83\u65e9\u65b9\u5411\u8c03\u6574<\/td>\n<\/tr>\n
1<\/td>\n0<\/td>\n0<\/td>\n\u4e0b\u964d\u6cbf，E1 \u5df2\u4e3a\u8df3\u53d8\u540e\u7535\u5e73<\/td>\n\u8fb9\u6cbf\u91c7\u6837\u76f8\u4f4d\u504f\u665a（Late）<\/td>\n\u5411\u8f83\u65e9\u65b9\u5411\u8c03\u6574<\/td>\n<\/tr>\n
1<\/td>\n0<\/td>\n1<\/td>\nD0\u3001D1 \u76f8\u540c\u800c E1 \u76f8\u53cd<\/td>\n\u65e0\u53ef\u9760\u9274\u76f8\u7ed3\u8bba<\/td>\n\u4e0d\u4f5c\u4e3a\u6709\u6548\u65b9\u5411<\/td>\n<\/tr>\n
1<\/td>\n1<\/td>\n0<\/td>\n\u4e0b\u964d\u6cbf，E1 \u4ecd\u4e3a\u8df3\u53d8\u524d\u7535\u5e73<\/td>\n\u8fb9\u6cbf\u91c7\u6837\u76f8\u4f4d\u504f\u65e9（Early）<\/td>\n\u5411\u8f83\u665a\u65b9\u5411\u8c03\u6574<\/td>\n<\/tr>\n
1<\/td>\n1<\/td>\n1<\/td>\n\u4fdd\u6301\u9ad8\u7535\u5e73，\u65e0\u6570\u636e\u8df3\u53d8<\/td>\n\u65e0\u65b0\u7684\u76f8\u4f4d\u4fe1\u606f<\/td>\n\u4e0d\u8c03\u6574<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

000 \u548c 111 \u8868\u793a\u76f8\u90bb\u6570\u636e\u6837\u672c\u4e4b\u95f4\u6ca1\u6709\u8df3\u53d8，\u65e0\u6cd5\u63d0\u4f9b\u65b0\u7684\u76f8\u4f4d\u4fe1\u606f\u3002010 \u548c 101 \u5219\u4e0d\u80fd\u7528\u76f8\u90bb\u6570\u636e\u91c7\u6837\u4e4b\u95f4\u7684\u4e00\u6b21\u6b63\u5e38\u8df3\u53d8\u89e3\u91ca，\u56e0\u6b64\u4e0d\u80fd\u5f62\u6210\u53ef\u9760\u7684\u504f\u65e9\u6216\u504f\u665a\u7ed3\u8bba\u3002\u8fd9\u91cc\u7684\u4e0d\u53ef\u9760\u53ea\u9488\u5bf9\u5f53\u524d\u4e09\u70b9\u7ec4\u5408\u7684\u9274\u76f8\u65b9\u5411，\u5e76\u4e0d\u8868\u793a FPGA \u4e1a\u52a1\u6570\u636e\u6216\u6574\u6761\u94fe\u8def\u5df2\u7ecf\u5931\u6548；CDR \u4f1a\u7ee7\u7eed\u7ed3\u5408\u540e\u7eed Data\/Edge \u6837\u672c\u8fdb\u884c\u5224\u65ad\u3002<\/p>\n

\u56fe\u4e2d\u7684\u201c\u8f83\u65e9\u201d\u548c\u201c\u8f83\u665a\u201d\u63cf\u8ff0\u8fb9\u6cbf\u91c7\u6837\u70b9\u76f8\u5bf9\u771f\u5b9e\u6570\u636e\u8df3\u53d8\u7684\u4f4d\u7f6e，\u63a7\u5236\u76ee\u6807\u662f\u4f7f Edge Sampler \u9760\u8fd1\u6570\u636e\u4ea4\u53c9\u70b9\u3002\u5b83\u8868\u793a\u7269\u7406\u91c7\u6837\u76f8\u4f4d\u7684\u8c03\u6574\u65b9\u5411，\u4e0d\u7b49\u540c\u4e8e PI \u63a7\u5236\u7801\u56fa\u5b9a\u5730\u589e\u52a0\u6216\u51cf\u5c0f\u3002<\/p>\n

Bang-Bang \u9274\u76f8\u7684\u5355\u6b21\u7ed3\u679c\u53ea\u5305\u542b\u8c03\u6574\u65b9\u5411，\u4e0d\u5305\u542b\u8fde\u7eed\u7684\u76f8\u4f4d\u8bef\u5dee\u503c\u3002\u82e5\u67d0\u4e00\u65b9\u5411\u7684\u5224\u51b3\u6301\u7eed\u5360\u4f18，CDR FSM \u5c31\u63a7\u5236 PI \u6cbf\u5bf9\u5e94\u65b9\u5411\u79fb\u52a8；\u5f53 E1 \u63a5\u8fd1\u771f\u5b9e\u6570\u636e\u4ea4\u53c9\u70b9\u540e，Early \u4e0e Late \u5224\u51b3\u901a\u5e38\u4f1a\u4ea4\u66ff\u51fa\u73b0，PI \u56f4\u7ed5\u6570\u636e\u8fb9\u6cbf\u8fdb\u884c\u5c0f\u8303\u56f4\u4fee\u6b63\u3002PI(X) \u4e0e PI(D) \u540c\u6b65\u8c03\u6574，\u4f7f Edge Sampler \u6301\u7eed\u8ddf\u968f\u6570\u636e\u8df3\u53d8，\u540c\u65f6\u8ba9 Data Sampler \u4fdd\u6301\u5728\u76f8\u90bb\u8fb9\u6cbf\u4e4b\u95f4\u3002<\/p>\n

4. \u4ece\u521d\u59cb\u76f8\u4f4d\u6355\u83b7\u5230\u8fde\u7eed\u8ddf\u8e2a<\/h3>\n

RX \u901a\u8def\u542f\u52a8\u65f6，CDR \u9700\u8981\u5148\u83b7\u5f97\u53ef\u7528\u7684\u57fa\u7840\u65f6\u949f\u548c\u8f93\u5165\u6570\u636e\u3002CPLL\/QPLL \u9501\u5b9a\u540e，\u9ad8\u901f\u65f6\u949f\u9891\u7387\u5df2\u7ecf\u8fdb\u5165\u76ee\u6807\u8303\u56f4，\u4f46\u5176\u76f8\u4f4d\u4e0e\u8fdc\u7aef\u53d1\u9001\u6570\u636e\u4e4b\u95f4\u6ca1\u6709\u56fa\u5b9a\u5173\u7cfb\u3002CDR \u4ece\u5f53\u524d\u76f8\u4f4d\u5f00\u59cb\u89c2\u5bdf\u6570\u636e\u8df3\u53d8，\u6839\u636e\u8fde\u7eed\u51fa\u73b0\u7684\u504f\u65e9\u6216\u504f\u665a\u5224\u51b3\u9a71\u52a8 PI \u5411\u5360\u4f18\u65b9\u5411\u6b65\u8fdb，\u76f4\u81f3 Edge Sampler \u5230\u8fbe UI \u8fb9\u754c\u9644\u8fd1\u3001Data Sampler \u843d\u5728\u76f8\u90bb\u8fb9\u6cbf\u4e4b\u95f4，\u8fd9\u4e00\u8fc7\u7a0b\u6784\u6210\u521d\u59cb\u76f8\u4f4d\u6355\u83b7\u3002<\/p>\n

\u8fdb\u5165\u7a33\u5b9a\u8ddf\u8e2a\u540e，\u76f8\u4f4d\u63d2\u503c\u5668\u4ecd\u4f1a\u7ee7\u7eed\u8c03\u6574\u3002\u5373\u4f7f\u672c\u5730\u53c2\u8003\u65f6\u949f\u7684\u6807\u79f0\u9891\u7387\u4e0e\u53d1\u9001\u7aef\u4e00\u81f4，\u4e24\u7aef\u72ec\u7acb\u65f6\u949f\u6e90\u4e5f\u53ef\u80fd\u5b58\u5728\u4e00\u5b9a\u9891\u7387\u504f\u5dee\u3002\u82e5\u63a5\u6536\u6570\u636e\u7565\u5feb\u4e8e\u672c\u5730\u57fa\u7840\u65f6\u949f，\u6570\u636e\u8fb9\u6cbf\u4f1a\u76f8\u5bf9\u5f53\u524d\u91c7\u6837\u76f8\u4f4d\u6301\u7eed\u5411\u4e00\u4e2a\u65b9\u5411\u79fb\u52a8，Bang-Bang \u9274\u76f8\u7ed3\u679c\u4e5f\u4f1a\u957f\u671f\u504f\u5411\u540c\u4e00\u65b9\u5411，CDR FSM \u56e0\u800c\u53cd\u590d\u9a71\u52a8 Phase Interpolator \u6cbf\u5bf9\u5e94\u65b9\u5411\u65cb\u8f6c\u76f8\u4f4d\u3002\u6570\u636e\u7565\u6162\u65f6，\u5224\u51b3\u504f\u5411\u548c\u8c03\u6574\u65b9\u5411\u76f8\u53cd\u3002<\/p>\n

\u56e0\u6b64，CDR \u5bf9\u9891\u7387\u504f\u5dee\u7684\u8ddf\u8e2a\u6700\u7ec8\u8868\u73b0\u4e3a\u8fde\u7eed\u7684\u76f8\u4f4d\u79fb\u52a8：<\/p>\n

\u65e0\u9891\u5dee：\u91c7\u6837\u76f8\u4f4d\u56f4\u7ed5\u7a33\u5b9a\u4f4d\u7f6e\u5c0f\u8303\u56f4\u8c03\u6574
\n\u6570\u636e\u504f\u5feb：Phase Interpolator \u6301\u7eed\u5411\u4e00\u4e2a\u65b9\u5411\u63a8\u8fdb
\n\u6570\u636e\u504f\u6162：Phase Interpolator \u6301\u7eed\u5411\u76f8\u53cd\u65b9\u5411\u63a8\u8fdb<\/p>\n

\u76f8\u4f4d\u63d2\u503c\u5668\u5b8c\u6210\u4e00\u4e2a\u76f8\u4f4d\u5468\u671f\u540e\u53ef\u4ee5\u7ee7\u7eed\u5faa\u73af\u65cb\u8f6c，CDR \u7531\u6b64\u5728\u672c\u5730 PLL \u9891\u7387\u9644\u8fd1\u8ddf\u968f\u8f93\u5165\u6570\u636e\u3002\u5b83\u80fd\u591f\u8ddf\u8e2a\u7684\u9891\u7387\u504f\u5dee\u8303\u56f4\u5e76\u975e\u65e0\u9650，\u5177\u4f53\u8fb9\u754c\u5e94\u7531\u5bf9\u5e94\u5668\u4ef6\u6570\u636e\u624b\u518c\u4e2d\u7684 RXPPMTOL \u7b49\u6307\u6807\u786e\u8ba4\u3002<\/p>\n

\u76f8\u4f4d\u5224\u65ad\u8fd8\u4f9d\u8d56\u8f93\u5165\u6570\u636e\u53d1\u751f\u8df3\u53d8\u3002\u8fde\u7eed\u76f8\u540c\u6bd4\u7279\u671f\u95f4\u6ca1\u6709\u65b0\u7684\u8fb9\u6cbf\u53ef\u4f9b\u6bd4\u8f83，CDR \u53ea\u80fd\u7ef4\u6301\u6b64\u524d\u5efa\u7acb\u7684\u63a7\u5236\u72b6\u6001，\u7b49\u5f85\u4e0b\u4e00\u6b21\u6709\u6548\u8df3\u53d8\u7ee7\u7eed\u4fee\u6b63\u3002\u5408\u9002\u7684\u7f16\u7801\u6216\u6270\u7801\u901a\u5e38\u80fd\u591f\u63d0\u9ad8\u8df3\u53d8\u5bc6\u5ea6，\u4e0d\u53ea\u662f\u4e3a\u4e86\u6539\u5584\u9891\u8c31，\u4e5f\u4e3a\u65f6\u949f\u6062\u590d\u63d0\u4f9b\u6301\u7eed\u7684\u76f8\u4f4d\u89c2\u6d4b\u3002\u94fe\u8def\u80fd\u591f\u5bb9\u5fcd\u7684\u6700\u5927\u8fde\u7eed\u76f8\u540c\u6bd4\u7279\u957f\u5ea6，\u8fd8\u9700\u8981\u7ed3\u5408\u5668\u4ef6\u6570\u636e\u624b\u518c\u548c\u6240\u7528\u7f16\u7801\u65b9\u5f0f\u5224\u65ad\u3002<\/p>\n

5. \u6062\u590d\u65f6\u949f\u4e0e RX \u5206\u9891\u8def\u5f84<\/h3>\n

<\/p>\n

\u8fd9\u5f20\u56fe\u4ee5 GTXE2_CHANNEL \u4e3a\u4f8b，\u628a\u53c2\u8003\u65f6\u949f\u3001PLL\u3001CDR\u3001SIPO \u548c RXOUTCLK \u8fde\u63a5\u5230\u540c\u4e00\u6761\u65f6\u949f\u8def\u5f84\u4e2d\u3002\u9605\u8bfb\u65f6\u53ef\u4ee5\u4ece\u5de6\u4e0b\u65b9\u7684\u53c2\u8003\u65f6\u949f\u5f00\u59cb，\u6cbf PLL \u548c CDR \u5411\u4e0a\u8fdb\u5165 RX PMA，\u518d\u6cbf\u5206\u9891\u94fe\u5411\u53f3\u89c2\u5bdf\u5e76\u884c\u65f6\u949f\u3002<\/p>\n

MGTREFCLK \u7ecf IBUFDS_GTE2 \u548c REFCLK Distribution \u8fdb\u5165\u53c2\u8003\u65f6\u949f\u9009\u62e9\u7f51\u7edc，\u968f\u540e\u9001\u5f80 Channel \u5185\u90e8\u7684 CPLL，\u6216\u8005\u901a\u8fc7 GTXE2_COMMON \u8fdb\u5165 QPLL\u3002RXSYSCLKSEL \u5728 CPLL \u4e0e QPLL \u7684\u9ad8\u901f\u65f6\u949f\u4e4b\u95f4\u9009\u62e9\u4e00\u8def，\u9001\u5165 CDR \u4e2d\u7684 Phase Interpolator\u3002<\/p>\n

CDR \u8c03\u6574\u540e\u7684\u9ad8\u901f\u91c7\u6837\u65f6\u949f\u76f4\u63a5\u9a71\u52a8\u4e32\u884c\u6570\u636e\u5224\u51b3\u548c SIPO\u3002\u5b8c\u6210\u4e32\u5e76\u8f6c\u6362\u540e，\u8be5\u65f6\u949f\u4f9d\u6b21\u7ecf\u8fc7 \/D\u3001\/4 \u6216 \/5\u3001\/2 \u6216 \/4 \u7b49\u5185\u90e8\u7ea7\u8054\u5206\u9891，\u4e0e RX PMA \u7684\u5e76\u884c\u6570\u636e\u5bbd\u5ea6\u548c\u5de5\u4f5c\u6a21\u5f0f\u5339\u914d\u3002\u5206\u9891\u94fe\u8f93\u51fa\u6784\u6210 PMA \u5e76\u884c\u4fa7\u7684 XCLK，\u5e76\u7ee7\u7eed\u8fde\u63a5 RX PCS \u6570\u636e\u901a\u8def\u3002<\/p>\n

\u56fe\u4e2d\u9700\u8981\u533a\u5206\u4e09\u7c7b\u76f8\u5173\u4f46\u4f4d\u7f6e\u4e0d\u540c\u7684\u65f6\u949f：<\/p>\n\n\u65f6\u949f\u6240\u5728\u4f4d\u7f6e\u4e3b\u8981\u4f5c\u7528<\/tr>\n\n\n\n\n
RX Serial Clock<\/td>\nCDR \u4e0e SIPO \u7684\u9ad8\u901f\u4e32\u884c\u4fa7<\/td>\n\u5bf9\u8f93\u5165\u4e32\u884c\u6570\u636e\u8fdb\u884c\u91c7\u6837\u548c\u4e32\u5e76\u8f6c\u6362<\/td>\n<\/tr>\n
XCLK<\/td>\nRX PMA \u5e76\u884c\u4fa7<\/td>\n\u627f\u63a5 SIPO \u4e4b\u540e\u7684\u5e76\u884c\u6570\u636e，\u5e76\u8fde\u63a5 RX PCS<\/td>\n<\/tr>\n
RXOUTCLK<\/td>\nGTXE2_CHANNEL \u8f93\u51fa\u65f6\u949f\u7aef\u53e3<\/td>\n\u5c06\u9009\u5b9a\u7684 PMA\u3001PCS \u6216\u53c2\u8003\u65f6\u949f\u8def\u5f84\u9001\u5f80 FPGA \u65f6\u949f\u8d44\u6e90<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

RXOUTCLKSEL \u51b3\u5b9a RXOUTCLK \u7684\u6765\u6e90\u3002\u9009\u62e9 RXOUTCLKPMA \u65f6，\u8f93\u51fa\u6765\u81ea CDR \u6062\u590d\u65f6\u949f\u7684 PMA \u5206\u9891\u8def\u5f84；\u9009\u62e9 RXOUTCLKPCS \u65f6，\u8f93\u51fa\u6765\u81ea PCS \u5e76\u884c\u65f6\u949f\u8def\u5f84；\u53e6\u5916\u8fd8\u53ef\u4ee5\u9009\u62e9\u6240\u7528 PLL \u53c2\u8003\u65f6\u949f\u7684\u76f4\u901a\u6216\u4e8c\u5206\u9891\u8def\u5f84\u3002RXOUTCLK \u56e0\u6b64\u53ea\u662f\u4e00\u4e2a\u53ef\u914d\u7f6e\u7684\u8f93\u51fa\u7aef\u53e3，\u4e0d\u80fd\u8131\u79bb RXOUTCLKSEL \u76f4\u63a5\u79f0\u4e3a\u201c\u6062\u590d\u65f6\u949f\u201d\u3002<\/p>\n

RX Elastic Buffer \u65c1\u8def\u65f6，RXOUTCLKSEL \u5e94\u9009\u62e9 RXOUTCLKPMA，\u4f7f RXOUTCLK \u8f93\u51fa\u6062\u590d\u65f6\u949f，\u518d\u7531 RXOUTCLK \u9a71\u52a8 RXUSRCLK\u3002\u542f\u7528 RX Elastic Buffer \u540e，\u6062\u590d\u4fa7 XCLK \u4e0e\u672c\u5730 RXUSRCLK \u53ef\u4ee5\u901a\u8fc7\u7f13\u51b2\u5668\u9694\u79bb，RXUSRCLK \u7684\u6765\u6e90\u5177\u6709\u66f4\u5927\u7684\u9009\u62e9\u7a7a\u95f4\u3002\u7f13\u51b2\u5668\u53ea\u6539\u53d8\u5e76\u884c\u65f6\u949f\u57df\u7684\u8854\u63a5\u65b9\u5f0f，\u4e0d\u6539\u53d8 CDR \u5728 SIPO \u4e4b\u524d\u5b8c\u6210\u4e32\u884c\u91c7\u6837\u7684\u804c\u8d23\u3002<\/p>\n

6. RX CDR \u5b9e\u6218\u914d\u7f6e：\u4ee5 GTX 5.0 Gb\/s\u30018B\/10B \u4e3a\u4f8b<\/h3>\n

RXCDR_CFG \u662f GTXE2_CHANNEL \u4e2d\u5bbd\u5ea6\u4e3a 72 bit \u7684\u914d\u7f6e\u5c5e\u6027，\u7528\u4e8e\u8bbe\u7f6e CDR \u5185\u90e8\u63a7\u5236\u73af\u8def\u3002\u8be5\u5c5e\u6027\u4e0d\u9700\u8981\u6839\u636e\u5185\u90e8\u4f4d\u57df\u9010\u9879\u63a8\u5bfc，UG476 \u5df2\u7ecf\u6309\u7167\u63a5\u6536\u6570\u636e\u7c7b\u578b\u3001SSC\u3001\u7ebf\u8def\u901f\u7387\u3001RXOUT_DIV\u3001\u53c2\u8003\u65f6\u949f\u9891\u504f\u548c\u5747\u8861\u6a21\u5f0f\u7ed9\u51fa\u4e86\u63a8\u8350\u53d6\u503c\u3002\u672c\u8282\u76f4\u63a5\u901a\u8fc7\u4e00\u4e2a GTX \u914d\u7f6e\u5b8c\u6210\u4e00\u6b21\u67e5\u8868\u8fc7\u7a0b\u3002<\/p>\n

\u6570\u636e\u7c7b\u578b\u4e0e SSC \u2192 \u7ebf\u8def\u901f\u7387 \u2192 RXOUT_DIV \u2192 REFCLK PPM \u2192 LPM\/DFE \u2192 RXCDR_CFG<\/p>\n

\u4ee5\u4e00\u6761 5.0 Gb\/s \u7684 GTX \u63a5\u6536\u901a\u9053\u4e3a\u4f8b，\u914d\u7f6e\u6761\u4ef6\u5982\u4e0b：<\/p>\n\n\u914d\u7f6e\u9879\u672c\u4f8b\u53d6\u503c<\/tr>\n\n\n\n\n\n\n\n\n
\u6536\u53d1\u5668\u7c7b\u578b<\/td>\nGTX<\/td>\n<\/tr>\n
\u7ebf\u8def\u901f\u7387<\/td>\n5.0 Gb\/s<\/td>\n<\/tr>\n
\u53c2\u8003\u65f6\u949f<\/td>\n125 MHz，\u7cbe\u5ea6 \u00b1100 ppm，\u4e0d\u4f7f\u7528 SSC<\/td>\n<\/tr>\n
PLL<\/td>\nCPLL<\/td>\n<\/tr>\n
RXOUT_DIV<\/td>\n1<\/td>\n<\/tr>\n
\u7ebf\u8def\u7f16\u7801<\/td>\n8B\/10B<\/td>\n<\/tr>\n
RX \u5747\u8861\u6a21\u5f0f<\/td>\nLPM<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5177\u4f53\u9009\u62e9\u53ef\u4ee5\u5206\u4e3a\u4e09\u6b65：<\/p>\n

  • \u786e\u5b9a\u6570\u636e\u7c7b\u578b\u3002 \u672c\u4f8b\u4f7f\u7528 8B\/10B \u7f16\u7801\u4e14\u4e0d\u4f7f\u7528 SSC，\u56e0\u6b64\u9009\u62e9 UG476 Table 4-19；Table 4-17 \u5bf9\u5e94\u7684\u662f Scrambled\/PRBS Data \u4e14\u4e0d\u4f7f\u7528 SSC \u7684\u60c5\u51b5\u3002<\/li>\n
  • \u786e\u5b9a\u901f\u7387\u4e0e\u5206\u9891\u3002 5.0 Gb\/s \u5c5e\u4e8e\u8868\u4e2d\u7684 Data Rate \u2264 6.6G，\u5f53\u524d RXOUT_DIV = 1，\u56e0\u6b64\u8fdb\u5165\u5bf9\u5e94\u7684\u901f\u7387\u548c\u5206\u9891\u884c\u3002<\/li>\n
  • \u786e\u5b9a\u53c2\u8003\u65f6\u949f\u9891\u504f\u3002 \u53c2\u8003\u65f6\u949f\u7cbe\u5ea6\u4e3a \u00b1100 ppm，\u843d\u5728\u8868\u4e2d\u7684 \u00b1200 ppm \u6863\u4f4d\u3002<\/li>\n

    <\/p>\n

    Table 4-19 \u7684\u8bfb\u53d6\u65b9\u5411\u662f\u4ece\u5de6\u5411\u53f3\u9010\u5217\u6536\u655b\u914d\u7f6e\u6761\u4ef6\u3002\u8be5\u8868\u5bf9 CPLL\/QPLL \u4ee5\u53ca LPM\/DFE \u4f7f\u7528\u540c\u4e00\u7ec4\u53d6\u503c；\u7ee7\u7eed\u5b9a\u4f4d Data Rate \u2264 6.6G\u3001RXOUT_DIV = 1 \u548c REFCLK PPM = \u00b1200 \u5bf9\u5e94\u7684\u884c，\u5373\u53ef\u5f97\u5230 RXCDR_CFG = 72\u2019h03_0000_23FF_1040_0020\u3002<\/p>\n

    \u5c06\u67e5\u8868\u7ed3\u679c\u5199\u5165 GTXE2_CHANNEL：<\/p>\n

    GTXE2_CHANNEL #(
    \n .RXOUT_DIV (1),
    \n .RXCDR_CFG (72'h03_0000_23FF_1040_0020)
    \n) u_gtxe2_channel (
    \n \/\/ \u5176\u4f59\u7aef\u53e3\u4e0e\u5c5e\u6027\u6309\u5de5\u7a0b\u914d\u7f6e\u8fde\u63a5
    \n);<\/p>\n

    \u8fd9\u91cc\u9009\u62e9 CPLL \u662f\u4e3a\u4e86\u7ed9\u51fa\u5b8c\u6574\u7684\u5de5\u7a0b\u6761\u4ef6；Table 4-19 \u5bf9 CPLL \u548c QPLL \u4f7f\u7528\u540c\u4e00\u7ec4\u63a8\u8350\u503c\u3002\u8868\u4e0b\u6ce8\u91ca\u540c\u65f6\u6307\u51fa，8B\/10B \u7f16\u7801\u6570\u636e\u63a8\u8350\u4f7f\u7528 LPM\u3002\u82e5\u5de5\u7a0b\u91c7\u7528\u7279\u5b9a\u534f\u8bae\u914d\u7f6e，\u4ecd\u5e94\u4ee5 Transceivers Wizard \u6216\u76f8\u5e94\u7684\u534f\u8bae\u7279\u6027\u62a5\u544a\u751f\u6210\u503c\u4e3a\u51c6\u3002<\/p>\n

    \u5982\u679c\u540c\u4e00\u6761 5.0 Gb\/s \u94fe\u8def\u4f20\u8f93\u7684\u662f Scrambled\/PRBS Data，\u5219\u5e94\u6539\u67e5 Table 4-17：<\/p>\n

    <\/p>\n

    \u67e5\u8868\u6761\u4ef6\u4ecd\u7136\u662f Data Rate \u2264 6.6G\u3001RXOUT_DIV = 1 \u548c REFCLK PPM = \u00b1200，\u4f46 Table 4-17 \u8fd8\u9700\u8981\u533a\u5206 LPM \u4e0e DFE\u3002\u6cbf LPM \u884c\u8bfb\u53d6，RXCDR_CFG \u4e3a 72\u2019h03_0000_23FF_1020_0020；\u6cbf DFE \u884c\u8bfb\u53d6，\u5219\u4e3a 72\u2019h03_0000_23FF_2040_0020\u3002\u4e0e\u524d\u9762\u7684 8B\/10B \u914d\u7f6e\u76f8\u6bd4，\u7ebf\u8def\u901f\u7387\u548c\u65f6\u949f\u6761\u4ef6\u90fd\u6ca1\u6709\u53d8\u5316，\u4ec5\u6570\u636e\u7c7b\u578b\u548c\u5747\u8861\u6a21\u5f0f\u4e0d\u540c，\u6700\u7ec8\u914d\u7f6e\u503c\u5df2\u7ecf\u53d1\u751f\u6539\u53d8\u3002<\/p>\n

    \u5b9e\u9645\u5de5\u7a0b\u53ef\u4ee5\u6cbf\u201c\u6570\u636e\u7c7b\u578b\u4e0e SSC \u2192 \u7ebf\u8def\u901f\u7387 \u2192 RXOUT_DIV \u2192 REFCLK PPM \u2192 LPM\/DFE\u201d\u7684\u987a\u5e8f，\u5728 UG476 \u5bf9\u5e94\u8868\u683c\u4e2d\u5f97\u5230\u63a8\u8350\u503c，\u518d\u4e0e Transceivers Wizard \u751f\u6210\u7684 RXCDR_CFG \u4ea4\u53c9\u6838\u5bf9\u3002Table 4-17 \u548c Table 4-19 \u5747\u4e3a GTX \u914d\u7f6e，\u4e0d\u80fd\u76f4\u63a5\u7528\u4e8e GTH；GTH \u7684 RXCDR_CFG \u4e3a 83 bit，\u5e94\u5728 UG476 \u4e2d\u67e5\u53d6\u4e0e\u6570\u636e\u7c7b\u578b\u548c SSC \u6761\u4ef6\u5bf9\u5e94\u7684 GTH CDR \u63a8\u8350\u914d\u7f6e\u3002\u4efb\u4e00\u914d\u7f6e\u6761\u4ef6\u53d1\u751f\u53d8\u5316\u540e，\u90fd\u9700\u8981\u91cd\u65b0\u67e5\u8868\u3002<\/p>\n

    \u9047\u5230\u7591\u4f3c CDR \u95ee\u9898\u65f6，\u9664\u4e86\u68c0\u67e5\u53c2\u8003\u65f6\u949f\u3001\u8f93\u5165\u6ce2\u5f62\u548c CPLLLOCK\/QPLLLOCK，\u8fd8\u5e94\u56de\u67e5 RXCDR_CFG \u7684\u9009\u62e9\u6761\u4ef6：\u5f53\u524d\u7ebf\u8def\u6570\u636e\u7a76\u7adf\u662f Scrambled\/PRBS\u30018B\/10B \u8fd8\u662f\u5e26 SSC \u7684\u534f\u8bae\u6570\u636e，\u5b9e\u9645\u7ebf\u8def\u901f\u7387\u4e0e RXOUT_DIV \u662f\u5426\u843d\u5728\u540c\u4e00\u884c，\u53c2\u8003\u65f6\u949f\u9891\u504f\u6863\u4f4d\u548c LPM\/DFE \u6a21\u5f0f\u662f\u5426\u5339\u914d，\u5de5\u7a0b\u4e2d\u7684\u5c5e\u6027\u503c\u662f\u5426\u4e0e UG476 \u6216 Wizard \u751f\u6210\u7ed3\u679c\u4e00\u81f4\u3002\u82e5\u8fd9\u4e9b\u6761\u4ef6\u4e2d\u6709\u4e00\u9879\u4e0d\u5339\u914d，\u5373\u4f7f CPLLLOCK\/QPLLLOCK \u548c RXRESETDONE \u5df2\u7ecf\u62c9\u9ad8，CDR \u4ecd\u53ef\u80fd\u65e0\u6cd5\u7a33\u5b9a\u8ddf\u8e2a\u8f93\u5165\u6570\u636e\u3002<\/p>\n

    \u4fee\u6539 RXCDR_CFG \u7b49 RX PMA \u5c5e\u6027\u540e，\u8fd8\u5e94\u6309\u7167\u5668\u4ef6\u89c4\u5b9a\u91cd\u65b0\u6267\u884c RX \u590d\u4f4d\u6d41\u7a0b\u3002\u6700\u7ec8\u63a5\u6536\u72b6\u6001\u9700\u8981\u7ed3\u5408 PRBS\u30018B\/10B \u9519\u8bef\u6307\u793a\u6216\u534f\u8bae\u8bad\u7ec3\u7ed3\u679c\u786e\u8ba4，\u4e0d\u80fd\u53ea\u7528 RXRESETDONE \u5224\u65ad CDR \u5df2\u7ecf\u7a33\u5b9a\u3002<\/p>\n

    7. \u603b\u7ed3<\/h3>\n

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