Two incoherent Caches interacting with single memory through memory_access_arbiter. Read/Writes from Host(CPU) to caches are modeled/initiated through cache_bfm. Upon cache_miss, the cache initiates memory read/write. memory_access_arbiter controls which cache gets to access memory at a time. Cache reads address 0x53 from memory upon cache_miss. After that it writes to that address but that cache entry becomes dirty/incoherent with memory. Another cache reads old value from memory. This demonstrates why cache coherency is needed.

COMPILE: vcs -lca -timescale=1ns/100ps -sverilog +verilog2001ext+.v -ntb_opts uvm-1.2 +define+WAVES_FSDB -kdb -debug_access+all -l cache_coherence_compile.log -f cache_coherence_tb_files.f -top cache_coherence_top SIMULATE: ./simv +vcs+lic+wait -l cache_coherence_sim.log +UVM_MAX_QUIT_COUNT=10000 +UVM_LOG_RECORD +UVM_TR_RECORD +ntb_random_seed=8976 +UVM_VERBOSITY=UVM_MEDIUM