Function emit_psram_cache_testbench 

pub fn emit_psram_cache_testbench(
    edge: &PsramEdge,
    cache: &PsramCache,
    run_period_ps: u32,
    seed: u32,
    words: u32,
    ops: u32,
) -> String

A randomized testbench for the cache: an engine-shaped driver that issues nothing while busy and otherwise a read (then waits a cycle and checks rd against a reference memory), a write of one or both halves of a word, or a write and a read together. Once the edge has initialized the part it writes every word it will use — words consecutive from 0 and words scattered over the whole part — then runs ops random operations. Prints CACHE-ERRORS, PSRAM-VIOLATIONS, the longest busy run as CACHE-MAX-STALL, the rising edge after reset at which req_ready was first seen as EDGE-READY-AT, then CACHE-DONE. The clock runs at run_period_ps, anywhere in the edge’s range.