Coding & Line Codes

8-bit Huffman Encoder (Static Table)

Streaming Huffman encoder for 8-bit symbols using a precomputed static code table and ready/valid handshakes.

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About this block

Simulate it in the Verilog IDE

Hardsystemverilogsimsyn

8-bit Huffman Encoder (Static Table) is a SystemVerilog reference block in the Coding & Line Codes catalog. Line codes, serializers, and digital encoding/decoding blocks. Marked Hard: a larger reference. Simulate the packaged testbench before you change the RTL.

This IP encodes an 8-bit symbol stream into variable-length Huffman codewords using a fixed lookup table. Input and output use ready/valid handshaking; out_eof marks end-of-frame after the last accepted input byte.

Suitable as a teaching/reference encoder block where table-based Huffman mapping is acceptable instead of dynamic tree building.

Choose Open in IDE. RTL Studio loads the packaged workspace for 8-bit Huffman Encoder (Static Table).
Read the SystemVerilog module in the editor. The catalog line for this block: Streaming Huffman encoder for 8-bit symbols using a precomputed static code table and ready/valid handshakes.
Run the packaged testbench with the in-browser Verilator simulator, then open the VCD in the waveform viewer.
Run Yosys in the same IDE for a generic netlist. Sky130 liberty mapping is a separate Pro library option.

RTL Studio is the Verilog simulator and IDE around this block: Slang lint, Verilator, VCD waveforms, and Yosys, in the browser. Simulation guide · Yosys guide.

Features

Static Huffman table for 256 ASCII-oriented symbols.
Streaming interface with in_valid/in_ready and out_valid/out_ready.
End-of-frame signaling via out_eof.
Verilator-safe testbench with self-checking test cases.

Ports

Port	Direction	Width	Description
`clk`	Input	1	System clock
`rst_n`	Input	1	Active-low reset
`in_valid`	Input	1	Input byte valid
`in_ready`	Output	1	Encoder ready for input
`in_data`	Input	8	Input symbol
`out_valid`	Output	1	Output codeword valid
`out_ready`	Input	1	Downstream ready
`out_data`	Output	8	Packed output byte
`out_eof`	Output	1	End of encoded frame

Verification

Run make sim in the IP leaf (Verilator + C++ wrapper). The log must contain INFO: PASS for promotion.

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