| `include "fwrisc_exec_formal_defines.svh" |
| |
| |
| module fwrisc_exec_formal_csr_checker( |
| input clock, |
| input reset, |
| input decode_valid, |
| input instr_complete, |
| |
| // Indicates whether the instruction is compressed |
| input instr_c, |
| |
| input[4:0] op_type, |
| |
| input[31:0] op_a, // jump_base |
| input[31:0] op_b, // always zero |
| input[5:0] op, |
| input[31:0] op_c, // jump_offset |
| input[5:0] rd, |
| |
| input[5:0] rd_waddr, |
| input[31:0] rd_wdata, |
| input rd_wen, |
| |
| input[31:0] pc, |
| // Indicates that the PC is sequential to the last PC |
| input pc_seq, |
| input[31:0] mtvec, |
| input[31:0] daddr, |
| input dvalid, |
| input dwrite, |
| input[31:0] dwdata, |
| input[3:0] dwstb, |
| input[31:0] drdata, |
| input dready |
| ); |
| `include "fwrisc_op_type.svh" |
| `include "fwrisc_alu_op.svh" |
| |
| reg[7:0] count = 0; |
| reg[31:0] wr_data; |
| (* keep *) |
| reg[31:0] exp_data; |
| reg instr_c_last; |
| reg[31:0] pc_last; |
| reg[2:0] rd_wr_count; |
| reg[5:0] rd_addr; |
| reg[31:0] rd_val; |
| reg[31:0] csr_val; |
| |
| always @(posedge clock) begin |
| if (reset) begin |
| count <= 0; |
| wr_data <= 0; |
| pc_last <= 0; |
| rd_wr_count <= 0; |
| rd_val <= 0; |
| end else begin |
| if (decode_valid) begin |
| pc_last <= pc; |
| instr_c_last <= instr_c; |
| end |
| if (rd_wen) begin |
| rd_wr_count <= rd_wr_count + 1; |
| assert(rd_waddr == rd || rd_waddr == op_c); |
| if (rd_waddr == rd) begin |
| rd_val <= rd_wdata; |
| end |
| if (rd_waddr == op_c) begin |
| csr_val <= rd_wdata; |
| end |
| end |
| if (instr_complete) begin |
| `assert(rd_wr_count == 2); |
| `assert(rd_val == op_b); // original CSR value |
| `assert(op == OP_OPA || op == OP_OR || op == OP_CLR); |
| `cover(op == OP_OPA); |
| `cover(op == OP_OR); |
| `cover(op == OP_CLR); |
| |
| case (op) |
| OP_OPA: begin |
| `assert(csr_val == op_a); // RS1 |
| end |
| OP_OR: begin |
| `assert(csr_val == (op_a | op_b)); |
| end |
| OP_CLR: begin |
| `assert(csr_val == (op_b ^ (op_a & op_b))); |
| end |
| default: `assert(0); |
| endcase |
| rd_wr_count <= 0; |
| end |
| end |
| end |
| |
| endmodule |
| |