efuse_token_digest_comparator

Compare two 256-bit token digests with hard-cell differential equal and not-equal trees.

Equal path (match_p_o): per-bit XNOR then radix-4 NAND/NOR reduction. Not-equal path (match_n_o): per-bit XOR then radix-4 OR4 reduction. Hard cells prevent synthesis from merging or optimizing away the compare logic (~682 cells per instance).

Parameters

Table 1. Parameters
Name	Type	Default	Description
`TokenWidth`	`int unsigned`	`256`	Token digest width in bits.
`L0Width`	`int unsigned`	`TokenWidth / 4`	Width of reduction level L0, one bit per four digest bits.
`L1Width`	`int unsigned`	`L0Width / 4`	Width of reduction level L1.
`L2Width`	`int unsigned`	`L1Width / 4`	Width of reduction level L2, which feeds the final four-input gate.

Ports

Table 2. Ports
Name	Direction	Type	Description
`token_digest_i`	input	`logic [TokenWidth-1:0]`	Computed 256-bit token digest.
`token_expected_i`	input	`logic [TokenWidth-1:0]`	Expected 256-bit token digest.
`match_p_o`	output	`logic`	1 = equal.
`match_n_o`	output	`logic`	1 = not equal.