mt103报文53a（mt103报文53b栏位）

编程日记 • 2025-01-25 20:21 • 阅读 13

50GBASE-KR (C137)

RS(544,514) -FEC��C91��

FECָ��ǰ��ܣ�forward error correction��ܡ�FEC�Ĺ��PCS��PMA��֮�䡣FEC��ͨ��ṩ��ķ�ʽʵ��·Ԥ��BER��ܡ�

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PCS lane 66B��ͬ��

AM��De-skew;

PCS lane��

PCS��AM�Ƴ��ɾ��AM��ָ��IDLE��;

64B/66B to 256B/257B ת����tx_coded _j<65:0>��j=0 to 3�� ת��һ��tx _scrambled<256:0>��tx _coded_0<0>��Ϊ��ݿ��ͬ��ͷ��أ��7��ͬ��ͷɾ��8��ص�1��ص�ͬ��ͷѹ��Ŀ��Ϊ��RS(544,514)��ռ䣩��

Codeword ��ǲ��룺Codeword Marker��ǲ��Ŀ�ķ��շ��Codeword��롣Codeword marker��cwm��ռ�ݴ��Ϣ��õ��ԭ��IDLE/LPI��򼯣��ÿ20480��257B��transcoded Block��81920��64B/66B Block��һ��cwm��cwmΪ257B��ݿ�(64��/alignment marker��4 alignment marker+1��0 )��

Reed-Solomon����20��256B/257B��Ϊһ��壨ÿ5140��Ϊһ��RS-FEC Codeword��ִ��RS(544,514)��루C=544,M=514,P=30��

Symbol�ַ���RS-FEC��ݷָ��2��Lane��

��շ��FEC�Ӳ��PMA�Ӳ��ݣ��ξ��ģ��:

Codeword marker lock��cwm��ǽ��

Lane����2��FEC Lane�ϲ��һ��Lane;

Reed-Solomon��ִ��RS(544,514)��룬�γ��ɸ��20��256B/257B��ÿ5140��Ϊһ��RS-FEC Codeword��

Codeword ��Ǳ��Ƴ��ÿ20480��257B��transcoded Block��81920��64B/66B Block��ɾ��һ��cwm��cwmΪ257B��ݿ�(64��/alignment marker��4 alignment marker+1��0 )��

256B/257B to 64B/66Bת����tx _scrambled<256:0>ת��tx _coded _j<65:0>��j=0 to 3��

PCS��AM��룺��AM��ɾ��IDLE�롣

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MDIO��ӳ��

��RS FEC��صļĴ��C45�Ĵ��DeviceID=1(PMA/PMD)���һ��򵥵Ľ��ܡ�

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mt103报文53a（mt103报文53b栏位）

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