vhdl编写，8b—10b 编解码器设计
Encoder:
8b/10b Encoder (file: 8b10b_enc.vhd)
Synchronous clocked inputs (latched on each clock rising edge)
8-bit parallel unencoded data input
KI input selects data or control encoding
Asynchronous active high reset initializes all logic
Encoded data output
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