diff options
Diffstat (limited to 'picorv32/scripts/smtbmc/notrap_validop.v')
-rw-r--r-- | picorv32/scripts/smtbmc/notrap_validop.v | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/picorv32/scripts/smtbmc/notrap_validop.v b/picorv32/scripts/smtbmc/notrap_validop.v new file mode 100644 index 0000000..8e50304 --- /dev/null +++ b/picorv32/scripts/smtbmc/notrap_validop.v @@ -0,0 +1,67 @@ +module testbench(input clk, mem_ready); + `include "opcode.v" + + reg resetn = 0; + always @(posedge clk) resetn <= 1; + + (* keep *) wire trap, mem_valid, mem_instr; + (* keep *) wire [3:0] mem_wstrb; + (* keep *) wire [31:0] mem_addr, mem_wdata, mem_rdata; + (* keep *) wire [35:0] trace_data; + + reg [31:0] mem [0:2**30-1]; + + assign mem_rdata = mem[mem_addr >> 2]; + + always @(posedge clk) begin + if (resetn && mem_valid && mem_ready) begin + if (mem_wstrb[3]) mem[mem_addr >> 2][31:24] <= mem_wdata[31:24]; + if (mem_wstrb[2]) mem[mem_addr >> 2][23:16] <= mem_wdata[23:16]; + if (mem_wstrb[1]) mem[mem_addr >> 2][15: 8] <= mem_wdata[15: 8]; + if (mem_wstrb[0]) mem[mem_addr >> 2][ 7: 0] <= mem_wdata[ 7: 0]; + end + end + + reg [1:0] mem_ready_stall = 0; + + always @(posedge clk) begin + mem_ready_stall <= {mem_ready_stall, mem_valid && !mem_ready}; + restrict(&mem_ready_stall == 0); + + if (mem_instr && mem_ready && mem_valid) begin + assume(opcode_valid(mem_rdata)); + assume(!opcode_branch(mem_rdata)); + assume(!opcode_load(mem_rdata)); + assume(!opcode_store(mem_rdata)); + end + + if (!mem_valid) + assume(!mem_ready); + + if (resetn) + assert(!trap); + end + + picorv32 #( + // change this settings as you like + .ENABLE_REGS_DUALPORT(1), + .TWO_STAGE_SHIFT(1), + .BARREL_SHIFTER(0), + .TWO_CYCLE_COMPARE(0), + .TWO_CYCLE_ALU(0), + .COMPRESSED_ISA(0), + .ENABLE_MUL(0), + .ENABLE_DIV(0) + ) cpu ( + .clk (clk ), + .resetn (resetn ), + .trap (trap ), + .mem_valid (mem_valid ), + .mem_instr (mem_instr ), + .mem_ready (mem_ready ), + .mem_addr (mem_addr ), + .mem_wdata (mem_wdata ), + .mem_wstrb (mem_wstrb ), + .mem_rdata (mem_rdata ) + ); +endmodule |