Testing the picoProcessor VHDL Models

Running A Test Program There are three test-bench configurations provided with the picoProcessor models. The files ■ test_bench_behav-config.vhd, ■ test_bench_unpipelined_single_cycle_rtl.vhd, and ■ test_bench_unpipelined_multicycle_rtl.vhd provide test configurations for the behavioral, single-cycle and multi-cycle models, respectively. Each test configuration simply combines the appropriate processor model with the test-bench architecture (described below). The program code that the test bench executes is loaded into instruction memory from a file named test.ppe. Additional test programs are provided in files named test1A.ppe, test1B.ppe, test2.ppe, etc. These files can be used to replace the contents of test.ppe and, in this way, load a different test program. Alternatively, the test configurations can be edited so that the test bench reads a file other then test.ppe.