Receiving SDH overhead processing requirements: 1, A1 and A2 bytes instruction byte header, A1 is " 11110110" , A2 is " 00101000" , for three consecutive A1 bytes followed by three A2 bytes of an SDH the beginning of the frame. Asked to design a state machine, from the continuous stream of bytes in the SDH transmission header to find out. 2, E2-byte path overhead for the service, then, for the public to contact voice channels, the bit-serial rate 64KHz (8* 8K = 64). SDH byte stream request from the extraction E2 bytes, and the serial output in accordance with rates of E2 64K stream and clock, which clock requires 64K basic uniform. (Including the serial data output port and 64K serial clock)

sdh_frame.vhd
sdh_frame_tb.vhd

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