Simple implementation of single-cycle datapath MIPS core in Verilog.
It supports I-type, R-type, load/store, branch and jump commands. You can test the core using ModelSim simulation tool and rom_init.dat file with your program. Also you can initialize RAM with ram_init.dat file.
Example of the rom_init.dat file:
// I-TYPE
// ______________________________________
// | OP | Rs | Rt | Imm |
001000_00000_00001_0000_0000_0000_1111 // #0 addi $r1, $r0, 15
001001_00001_00010_1111_1111_1111_1011 // #1 addiu $r2, $r1, -5
001100_00010_00011_0000_0000_0000_1100 // #2 andi $r3, $r2, 12
001101_00011_00100_0000_0000_0000_0011 // #3 ori $r4, $r3, 3
001010_00011_00101_0000_0000_0000_1110 // #4 slti $r5, $r3, 14
// R-TYPE
// _____________________________________
// | OP | Rs | Rt | Rd | sa |funct |
000000_00001_00010_00101_00000_100000 // #5 add $r5, $r1, $r2
000000_00011_00100_00110_00000_100001 // #6 addu $r6, $r3, $r4
000000_00101_00110_00111_00000_100010 // #7 sub $r7, $r5, $r6
000000_00110_00111_01000_00000_100011 // #8 subu $r8, $r6, $r7
000000_00111_01000_01001_00000_100100 // #9 and $r9, $r7, $r8
000000_00100_01001_01010_00000_100101 // #10 or $r10, $r4, $r9
000000_00100_01001_01100_00000_100111 // #11 nor $r12, $r4, $r9
000000_01010_01001_01001_00000_101010 // #12 slt $r9, $r10, $9
// LOAD / STORE // LOAD -- Rt <- MEMORY[Rs + Imm]
// ______________________________________ // STORE -- Rt -> MEMORY[Rs + Imm]
// | OP | Rs | Rt | Imm | // (Rs - base address, Imm - offset)
101011_00000_01010_0000_0000_0000_0001 // #13 sw $r10, 1($r0)
100011_00000_01011_0000_0000_0000_0001 // #14 lw $r11, 1(&r0)
// BRANCH
// ______________________________________
// | OP | Rs | Rt | Imm |
000100_01000_01010_0000_0000_0000_0101 // #15 beq $r8, $r10, 15
// I-TYPE
// ______________________________________
// | OP | Rs | Rt | Imm |
001000_01000_01000_0000_0000_0000_0001 // #16 addi $r8, $r8, 1
// JUMP
// _______________________________________
// | OP | Imm |
000010_00_0000_0000_0000_0000_0000_1111 // #17 j 15
For easier viewing the result of simulation you can use wave.do file. Example of simulation:
