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reference_solutions.tlv
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\m5_TLV_version 1d: tl-x.org
\m5
use(m5-1.0)
// ==========================================
// Provides reference solutions
// without visibility to source code.
// ==========================================
// ----------------------------------
// Instructions:
// - When stuck on a particular lab, provide the LabId below, and compile/simulate.
// - A reference solution will build, but the source code will not be visible.
// - You may use waveforms, diagrams, and visualization to understand the proper circuit, but you
// will have to come up with the code. Logic expression syntax can be found by hovering over the
// signal assignment in the diagram.
// ----------------------------------
// Provide the Lab ID given at the lower right of the slide.
var(LabId, C-OUT)
var(my_design, tt_um_template)
// ================================================
// No need to touch anything below this line.
if_ndef(MAKERCHIP, ['set(MAKERCHIP, 0)'])
// Is this a calculator lab?
var(CalcLab, m5_if_regex(m5_LabId, ^\(C\)-, (C), 1, 0))
// ========
// Settings
// ========
default_var(my_design, m5_if(m5_CalcLab, tt_um_calc, tt_um_riscv_cpu)) /// Change to tt_um_<your-github-username>_riscv_cpu. (See Tiny Tapeout repo README.md.)
var(target, TT10) /// Use "FPGA" for TT03 Demo Boards (without bidirectional I/Os).
var(debounce_inputs, 0)
/// Legal values:
/// 1: Provide synchronization and debouncing on all input signals.
/// 0: Don't provide synchronization and debouncing.
/// m5_if_defined_as(MAKERCHIP, 1, 0, 1): Debounce unless in Makerchip.
// CPU configs
var(num_regs, 16) // 32 for full reg file.
var(dmem_size, 8) // A power of 2.
// ======================
// Computed From Settings
// ======================
// If debouncing, a user's module is within a wrapper, so it has a different name.
var(user_module_name, m5_if(m5_debounce_inputs, my_design, m5_my_design))
var(debounce_cnt, m5_if_defined_as(MAKERCHIP, 1, 8'h03, 8'hff))
\SV
// =================
// Include Libraries
// =================
// Include Tiny Tapeout Lab.
m4_include_lib(['https:/']['/raw.githubusercontent.com/os-fpga/Virtual-FPGA-Lab/5744600215af09224b7235479be84c30c6e50cb7/tlv_lib/tiny_tapeout_lib.tlv'])
m4_include_lib(https:/['']/raw.githubusercontent.com/efabless/chipcraft---mest-course/main/tlv_lib/m5_if(m5_CalcLab, calculator_shell_lib.tlv, risc-v_shell_lib.tlv))
// Solutions
///m4_include_makerchip_hidden(['mest_course_solutions.private.tlv'])
\m5
///use(m5-1.0)
///nullify(m4_include_lib(https:/['']/raw.githubusercontent.com/efabless/chipcraft---mest-course/main/tlv_lib/m5_if(m5_CalcLab, calculator_shell_lib.tlv, risc-v_shell_lib.tlv)))
universal_var(input_labels, ['"UNUSED", "UNUSED", "UNUSED", "UNUSED", "UNUSED", "UNUSED", "UNUSED", "UNUSED"'])
universal_var(ui_in_expr, ['8'b0'])
/Define labs.
var(LabCnt, 0)
fn(define_labs, LabId, ..., {
/Map ID to number.
universal_var(lab_\m5_LabId['']_num, m5_LabCnt)
on_return(increment, LabCnt)
on_return(if, $# > 0, {
define_labs($@)
})
})
fn(lab_num, LabId, {
~if_var_def(lab_\m5_LabId['']_num, [
~get(lab_\m5_LabId['']_num)
], [
errprint_nl(Lab ID "m5_LabId" not defined.)
~(0)
])
})
/Provide code introduced by given LabId, included if lab has been reached.
fn(lab, LabId, Code, {
~eval(['m4_ifelse_block(m5_calc(m5_lab_num(m5_LabId) <= m5_Lab), 1, [
~(['// Lab m5_LabId: '])
on_return(eval, m5_Code)
])'])
})
fn(reached, LabId, {
~calc(m5_Lab >= m5_lab_num(m5_LabId))
})
/Define m5_Lab.
fn(define_lab, {
universal_var(Lab, m5_lab_num(m5_LabId))
})
if(m5_CalcLab, [
define_labs(C-PIPE, C-OUT, C-IN, C-EQUALS, C-2CYC, C-VALID, C-MEM, C-TB, C-MEM2-DISABLED) /// Note C-TB and C-MEM2-DISABLED labs are no longer part of course.
define_lab()
set(input_labels, ['"Value[0]", "Value[1]", "Value[2]", "Value[3]", "Op[0]", "Op[1]", "Op[2]", "="'])
set(ui_in_expr, ['r[7:0]'])
var(OUTPUT_STAGE, m5_if(m5_reached(C-2CYC), 2, 1))
])
else([
define_labs(PC_BROKEN, FETCH1, FETCH2, TYPE, IMM, FIELDS, FIELDS_VALID, INSTR, RF_RD, RF_RD2, ALU, RF_WR, BR1, BR2,
TB, 3CYC_VALID, 3CYC1, 3CYC2, RF_BYPASS, BR_VALID, ALL_INSTR, FULL_ALU, PRAGMAS, LD_REDIR, LD_DATA, DMEM, LD_ST_TB, DONE)
define_lab()
TLV_fn(riscv_sum_prog, {
var(Prog, ['
# /====================\
# | Sum 1 to 9 Program |
# \====================/
#
# Program for RISC-V Workshop to test RV32I
# Add 1,2,3,...,9 (in that order).
#
# Regs:
# x10 (a0): In: 0, Out: final sum
# x12 (a2): 10
# x13 (a3): 1..10
# x14 (a4): Sum
#
# External to function:
reset:
ADD x10, x0, x0 # Initialize r10 (a0) to 0.
# Function:
ADD x14, x10, x0 # Initialize sum register a4 with 0x0
ADDI x12, x10, 10 # Store count of 10 in register a2.
ADD x13, x10, x0 # Initialize intermediate sum register a3 with 0
loop:
ADD x14, x13, x14 # Incremental addition
ADDI x13, x13, 1 # Increment count register by 1
BLT x13, x12, loop # If a3 is less than a2, branch to label named <loop>
done:
ADD x10, x14, x0 # Store final result to register a0 so that it can be read by main program
# Optional:
# JAL x7, 00000000000000000000 # Done. Jump to itself (infinite loop). (Up to 20-bit signed immediate plus implicit 0 bit (unlike JALR) provides byte address; last immediate bit should also be 0)
'])
if(m5_reached(LD_ST_TB), ['m5_append_var(Prog, ['
ld_st_lab:
SW x10, 4(x0) # Add SW , LW instructions to check dmem implementation
LW x15, 4(x0)
'])'])
~assemble(m5_Prog)
})
])
\TLV hidden_solution()
m5+call(m5_if(m5_CalcLab, calc_solution, cpu_solution))
\TLV calc_solution()
|calc
// ============================================================================================================
@1
$reset = *reset;
m4_ifelse_block(m5_reached(C-IN), 1, ['
@0
// Board inputs
m5_if(m5_reached(C-MEM), ['$op[2:0] = *ui_in[6:4];'], ['$op[1:0] = *ui_in[5:4];'])
$val2[7:0] = {4'b0, *ui_in[3:0]};
$equals_in = *ui_in[7];
'])
@1
$val1[7:0] = >>m5_OUTPUT_STAGE$out;
m5_if(m5_reached(C-IN), [''], ['$val2[7:0] = m5_if(m5_reached(C-OUT), ['8'b1'], ['{5'b0, $rand2[2:0]}']);'])
m5_if(m5_Lab == m5_lab_num(C-OUT), ['$op[1:0] = 2'b00;'])
m4_ifelse_block(m5_reached(C-EQUALS), 1, ['
$valid = $reset ? 1'b0 :
$equals_in && ! >>1$equals_in;
'])
m4_ifelse_block(m5_reached(C-MEM2-DISABLED), 1, ['
/mem_array[7:0]
$wr = (#mem_array == |calc$val1[2:0]) && (|calc$op[2:0] == 3'b101) && |calc$valid;
$value[31:0] = |calc$reset ? 32'b0 :
$wr ? |calc>>2$out :
$RETAIN;
'])
m4_ifelse_block(m5_reached(C-VALID), 1, ['
?$valid
@1
$sum[7:0] = $val1 + $val2;
$diff[7:0] = $val1 - $val2;
$prod[7:0] = $val1 * $val2;
$quot[7:0] = $val1 / $val2;
@m5_OUTPUT_STAGE
m4_ifelse_block(m5_reached(C-MEM), 1, ['
$mem[7:0] = $reset ? 8'b0 :
$valid && ($op[2:0] == 3'b101) ? m5_if(m5_reached(C-MEM2-DISABLED), ['/mem_array[$val1[2:0]]$value :'], ['$val1 :'])
>>1$mem;
'])
'], ['
@1
$sum[7:0] = $val1 + $val2;
$diff[7:0] = $val1 - $val2;
$prod[7:0] = $val1 * $val2;
$quot[7:0] = $val1 / $val2;
'])
@m5_OUTPUT_STAGE
$out[7:0] = $reset ? 8'b0 :
m5_if(m5_reached(C-EQUALS), ['! $valid ? >>1$out :'])
(m5_if(m5_reached(C-MEM), ['$op == 3'b000'], ['$op[1:0] == 2'b00'])) ? $sum :
(m5_if(m5_reached(C-MEM), ['$op == 3'b001'], ['$op[1:0] == 2'b01'])) ? $diff :
(m5_if(m5_reached(C-MEM), ['$op == 3'b010'], ['$op[1:0] == 2'b10'])) ? $prod :
m5_if(m5_reached(C-MEM), ['($op == 3'b011) ? $quot :'], [' $quot;'])
m5_if(m5_reached(C-MEM), ['($op == 3'b100) ? >>2$mem : >>1$out;'])
m4_ifelse_block(m5_reached(C-OUT), 1, ['
m5_if(m5_reached(C-2CYC), @3, @1)
$digit[3:0] = $out[3:0];
*uo_out =
$digit == 4'h0 ? 8'b00111111 :
$digit == 4'h1 ? 8'b00000110 :
$digit == 4'h2 ? 8'b01011011 :
$digit == 4'h3 ? 8'b01001111 :
$digit == 4'h4 ? 8'b01100110 :
$digit == 4'h5 ? 8'b01101101 :
$digit == 4'h6 ? 8'b01111101 :
$digit == 4'h7 ? 8'b00000111 :
$digit == 4'h8 ? 8'b01111111 :
$digit == 4'h9 ? 8'b01101111 :
$digit == 4'hA ? 8'b01110111 :
$digit == 4'hB ? 8'b01111100 :
$digit == 4'hC ? 8'b00111001 :
$digit == 4'hD ? 8'b01011110 :
$digit == 4'hE ? 8'b01111001 :
8'b01110001;
'], ['
*uo_out = 8'b0;
'])
m5+cal_viz(@m5_OUTPUT_STAGE, /fpga)
// ============================================================================================================
// Connect Tiny Tapeout outputs.
// (*uo_out connected above.)
*uio_out = 8'b0;
*uio_oe = 8'b0;
\TLV cpu_solution()
m5+riscv_gen()
m5+riscv_sum_prog()
m5_define_hier(IMEM, m5_NUM_INSTRS)
|cpu
@0
$reset = *reset;
// ============================================================================================================
// Solutions: Cut this section to provide the shell.
m5_var(rf_rd_stage, @1)
m5_var(rf_wr_stage, @1)
// Define the logic that will be included, based on lab ID.
m5_lab(PC_BROKEN, ['Next PC
m5_var(pc_style, 1)
'])
m5_var(imem_enable, 0)
m5_lab(FETCH1, ['Fetch (part 1)
m5_set(imem_enable, 1)
'])
m5_var(fetch_enable, 0)
m5_lab(FETCH2, ['Fetch (part 2)
m5_set(fetch_enable, 1)
'])
m5_lab(TYPE, ['Instruction Types Decode and Immediate Decode
@1
// Types
$is_i_instr = $instr[6:3] == 4'b0000 ||
$instr[6:2] == 5'b00100 ||
$instr[6:2] == 5'b00110 ||
$instr[6:2] == 5'b11001 ;
$is_r_instr = $instr[6:2] == 5'b01011 ||
$instr[6:2] == 5'b01100 ||
$instr[6:2] == 5'b01110 ||
$instr[6:2] == 5'b10100 ;
$is_s_instr = $instr[6:3] == 4'b0100;
$is_b_instr = $instr[6:2] == 5'b11000;
$is_j_instr = $instr[6:2] == 5'b11011;
$is_u_instr = $instr[6:2] == 5'b00101 ||
$instr[6:2] == 5'b01101;
'])
m5_lab(IMM, ['Instruction Immediate Value Decoded
// Immediate
$imm[31:0] = $is_i_instr ? {{21{$instr[31]}}, $instr[30:20]} :
$is_s_instr ? {{21{$instr[31]}}, $instr[30:25], $instr[11:7]} :
$is_b_instr ? {{20{$instr[31]}}, $instr[7], $instr[30:25], $instr[11:8], 1'b0} :
$is_u_instr ? {$instr[31:12], 12'b0} :
$is_j_instr ? {{12{$instr[31]}}, $instr[19:12], $instr[20], $instr[30:21], 1'b0} :
32'b0 ;
'])
m5_var(fields_style, 0)
m5_lab(FIELDS, ['Instruction Immediate Valid
m5_set(fields_style, 1)
'])
m5_lab(FIELDS_VALID, ['Instruction Field Decode
m5_set(fields_style, 2)
@1
$funct7_valid = $is_r_instr;
$funct3_valid = $is_r_instr || $is_i_instr || $is_s_instr || $is_b_instr;
$rs1_valid = $is_r_instr || $is_i_instr || $is_s_instr || $is_b_instr;
$rs2_valid = $is_r_instr || $is_s_instr || $is_b_instr ;
$rd_valid = $is_r_instr || $is_i_instr || $is_u_instr || $is_j_instr;
'])
m5_var(decode_enable, 0)
m5_lab(INSTR, ['Instruction Decode
m5_set(decode_enable, 1)
m5_var(decode_stage, @1)
'])
m5_var(rf_enable, 0)
m5_var(rf_style, 0)
m5_var(rf_common_rd, 0)
m5_lab(RF_RD, ['Register File Read
m5_set(rf_enable, 1)
m5_set(rf_rd_stage, @1)
m5_set(rf_wr_stage, @1)
m5_set(rf_style, 1)
m5_set(rf_common_rd, 1)
'])
m5_var(rf_bypass, 0)
m5_var(rf_rd_data, 0)
m5_lab(RF_RD2, ['Register File Read (part 2)
m5_var(rf_rd_data, 1)
'])
m5_var(alu_style, 0)
m5_lab(ALU, ['Arithmetic Logic Unit
m5_set(alu_style, 1)
m5_var(alu_stage, @1)
'])
m5_lab(RF_WR, ['Register File Write
m5_set(rf_style, 2)
'])
m5_var(br_enable, 0)
m5_lab(BR1, ['Branches (part 1)
m5_set(br_enable, 1)
m5_var(br_stage, @1)
'])
m5_var(tgt_enable, 0)
m5_lab(BR2, ['Branches (part 2)
m5_set(pc_style, 2)
m5_set(tgt_enable, 1)
m5_var(tgt_stage, @1)
'])
m5_var(tb_style, 0)
m5_lab(TB, ['Testbench
m5_set(tb_style, 1)
'])
m5_var(valid_style, 0)
m5_lab(3CYC_VALID, ['3-Cycle Valid
m5_set(valid_style, 1)
'])
m5_lab(3CYC1, ['3-Cycle RISC-V (part 1)
m5_set(rf_style, 3)
m5_set(pc_style, 3)
@1
$inc_pc[31:0] = $pc + 32'd4;
@m5_if_eq(m5_LabId, 3CYC1, 1, 3)
$valid_taken_br = $valid && $taken_br;
'])
m5_lab(3CYC2, ['3-Cycle RISC-V (part 2)
m5_set(rf_rd_stage, @2)
m5_set(rf_wr_stage, @3)
m5_set(tgt_stage, @2)
m5_set(alu_stage, @3)
m5_set(br_stage, @3)
'])
m5_lab(RF_BYPASS, ['Register File Bypass
m5_set(rf_bypass, 1)
'])
m5_lab(BR_VALID, ['Determining Branch Shadow
m5_set(pc_style, 4)
m5_set(valid_style, 2)
'])
m5_lab(ALL_INSTR, ['Complete Instruction Decode
m5_set(decode_stage, @1)
@1
$is_lui = $dec_bits[6:0] == 7'b0110111 ;
$is_auipc = $dec_bits[6:0] == 7'b0010111 ;
$is_jal = $dec_bits[6:0] == 7'b1101111 ;
$is_jalr = $dec_bits[9:0] == 10'b000_1100111 ;
$is_load = $opcode == 7'b0000011 ;
//$is_sb = $dec_bits[9:0] == 10'b000_0100011 ;
//$is_sh = $dec_bits[9:0] == 10'b001_0100011 ;
//$is_sw = $dec_bits[9:0] == 10'b010_0100011 ;
$is_slti = $dec_bits[9:0] == 10'b010_0010011 ;
$is_sltiu = $dec_bits[9:0] == 10'b011_0010011 ;
$is_xori = $dec_bits[9:0] == 10'b100_0010011 ;
$is_ori = $dec_bits[9:0] == 10'b110_0010011 ;
$is_andi = $dec_bits[9:0] == 10'b111_0010011 ;
$is_slli = $dec_bits == 11'b0_001_0010011 ;
$is_srli = $dec_bits == 11'b0_101_0010011 ;
$is_srai = $dec_bits == 11'b1_101_0010011 ;
$is_sub = $dec_bits == 11'b1_000_0110011 ;
$is_sll = $dec_bits == 11'b0_001_0110011 ;
$is_slt = $dec_bits == 11'b0_010_0110011 ;
$is_sltu = $dec_bits == 11'b0_011_0110011 ;
$is_xor = $dec_bits == 11'b0_100_0110011 ;
$is_srl = $dec_bits == 11'b0_101_0110011 ;
$is_sra = $dec_bits == 11'b1_101_0110011 ;
$is_or = $dec_bits == 11'b0_110_0110011 ;
$is_and = $dec_bits == 11'b0_111_0110011 ;
'])
m5_lab(FULL_ALU, ['Complete ALU
m5_set(alu_style, 2)
m5_alu_stage
m5_if(m5_reached(PRAGMAS), /* verilator lint_off WIDTH */)
$sltu_rslt[31:0] = $src1_value < $src2_value ;
$sltiu_rslt[31:0] = $src1_value < $imm;
m5_if(m5_reached(PRAGMAS), /* verilator lint_on WIDTH */)
'])
m5_lab(LD_REDIR, ['Redirect Loads
m5_set(valid_style, 3)
m5_set(pc_style, 5)
@3
$valid_load = $valid && $is_load;
'])
m5_lab(LD_DATA, ['Load Data
m5_set(alu_style, 3)
m5_set(rf_style, 4)
'])
m5_lab(DMEM, ['Data Memory
@4
$dmem_wr_en = $is_s_instr && $valid;
$dmem_wr_data[31:0] = $src2_value;
$dmem_rd_en = $valid_load;
$dmem_addr[2:0] = $result[4:2];
@5
$ld_data[31:0] = $dmem_rd_data;
m4+dmem(@4)
'])
m5_lab(LD_ST_TB, ['Load/Store in Program
|cpu
m5_set(tb_style, 2)
'])
m5_lab(DONE, ['Jumps
m5_set(valid_style, 4)
m5_set(pc_style, 6)
@3
$is_jump = $is_jal || $is_jalr;
$jalr_tgt_pc[31:0] = $src1_value + $imm;
$valid_jump = $is_jump && $valid;
'])
// Logic that changes throughout.
@0
m4_ifelse_block(m5_pc_style, 1, ['
$pc[31:0] = >>1$reset ? 32'b0 :
>>1$pc + 32'd4;
'], m5_pc_style, 2, ['
$pc[31:0] = >>1$reset ? '0 :
>>1$taken_br ? >>1$br_tgt_pc :
>>1$pc + 32'd4;
'], m5_pc_style, 3, ['
$pc[31:0] = >>1$reset ? '0 :
>>3$valid_taken_br ? >>3$br_tgt_pc :
>>3$inc_pc ;
'], m5_pc_style, 4, ['
$pc[31:0] = >>1$reset ? '0 :
>>3$valid_taken_br ? >>3$br_tgt_pc :
>>1$inc_pc ;
'], m5_pc_style, 5, ['
$pc[31:0] = >>1$reset ? '0 :
>>3$valid_taken_br ? >>3$br_tgt_pc :
>>3$valid_load ? >>3$inc_pc :
>>1$inc_pc ;
'], m5_pc_style, 6, ['
$pc[31:0] = >>1$reset ? '0 :
>>3$valid_taken_br ? >>3$br_tgt_pc :
>>3$valid_load ? >>3$inc_pc :
>>3$valid_jump && >>3$is_jal ? >>3$br_tgt_pc :
>>3$valid_jump && >>3$is_jalr ? >>3$jalr_tgt_pc :
>>1$inc_pc ;
'])
m4_ifelse_block(m5_tgt_enable, 1, ['
m5_tgt_stage
$br_tgt_pc[31:0] = $pc + $imm;
'])
m4_ifelse_block(m5_fetch_enable, 1, ['
@0
$imem_rd_en = !$reset;
$imem_rd_addr[m5_IMEM_INDEX_CNT-1:0] = $pc[m5_IMEM_INDEX_CNT+1:2];
@1
$instr[31:0] = $imem_rd_data[31:0];
//`BOGUS_USE($instr)
'])
m4_ifelse_block(m5_fields_style, 1, ['
@1
$funct7[6:0] = $instr[31:25];
$funct3[2:0] = $instr[14:12];
$rs1[4:0] = $instr[19:15];
$rs2[4:0] = $instr[24:20];
$rd[4:0] = $instr[11:7];
$opcode[6:0] = $instr[6:0];
//`BOGUS_USE($funct7 $funct3 $opcode)
'], m5_fields_style, 2, [' // Other fields
@1
?$funct7_valid
$funct7[6:0] = $instr[31:25];
?$funct3_valid
$funct3[2:0] = $instr[14:12];
?$rs1_valid
$rs1[4:0] = $instr[19:15];
?$rs2_valid
$rs2[4:0] = $instr[24:20];
?$rd_valid
$rd[4:0] = $instr[11:7];
$opcode[6:0] = $instr[6:0];
//`BOGUS_USE($funct7 $funct3 $opcode $funct3)
'])
m4_ifelse_block(m5_decode_enable, 1, ['
m5_decode_stage
$dec_bits[10:0] = {$funct7[5], $funct3, $opcode};
$is_beq = $dec_bits[9:0] == 10'b000_1100011 ;
$is_bne = $dec_bits[9:0] == 10'b001_1100011 ;
$is_blt = $dec_bits[9:0] == 10'b100_1100011 ;
$is_bge = $dec_bits[9:0] == 10'b101_1100011 ;
$is_bltu = $dec_bits[9:0] == 10'b110_1100011 ;
$is_bgeu = $dec_bits[9:0] == 10'b111_1100011 ;
$is_addi = $dec_bits[9:0] == 10'b000_0010011 ;
$is_add = $dec_bits == 11'b0_000_0110011 ;
'])
m5_rf_rd_stage
m4_ifelse_block(m5_rf_common_rd, 1, ['
$rf_rd_en1 = $rs1_valid;
$rf_rd_en2 = $rs2_valid;
$rf_rd_index1[4:0] = $rs1;
$rf_rd_index2[4:0] = $rs2;
'])
m4_ifelse_block(m5_rf_enable, 1, ['
m4_ifelse_block(m5_rf_bypass, 0, ['
m4_ifelse_block(m5_rf_rd_data, 1, ['
$src1_value[31:0] = $rf_rd_data1;
$src2_value[31:0] = $rf_rd_data2;
'])
'], m5_rf_bypass, 1, ['
$src1_value[31:0] =
(>>1$rf_wr_index == $rf_rd_index1) && >>1$rf_wr_en
? >>1$result :
$rf_rd_data1 ;
$src2_value[31:0] =
(>>1$rf_wr_index == $rf_rd_index2) && >>1$rf_wr_en
? >>1$result :
$rf_rd_data2 ;
'])
'])
m5_rf_wr_stage
m4_ifelse_block(m5_rf_style, 1, ['
$rf_wr_en = 1'b0;
$rf_wr_index[4:0] = 5'b0;
$rf_wr_data[31:0] = 32'b0;
'], m5_rf_style, 2, ['
$rf_wr_en = $rd_valid && $rd != 5'b0;
$rf_wr_index[4:0] = $rd;
$rf_wr_data[31:0] = $result;
'], m5_rf_style, 3, ['
$rf_wr_en = $rd_valid && $rd != 5'b0 && $valid;
$rf_wr_index[4:0] = $rd;
$rf_wr_data[31:0] = $result;
'], m5_rf_style, 4, ['
$rf_wr_en = ($rd_valid && $valid && $rd != 5'b0) || >>2$valid_load;
$rf_wr_index[4:0] = >>2$valid_load ? >>2$rd : $rd;
$rf_wr_data[31:0] = >>2$valid_load ? >>2$ld_data : $result;
'])
m5_if(m5_reached(PRAGMAS), /* verilator lint_off WIDTH */)
m4_ifelse_block(m5_alu_style, 1, ['
m5_alu_stage
$result[31:0] = $is_addi ? $src1_value + $imm :
$is_add ? $src1_value + $src2_value :
32'bx;
'], m5_calc(m5_eq(m5_alu_style, 2) || m5_eq(m5_alu_style, 3)), 1, ['
m5_alu_stage
$result[31:0] = $is_andi ? $src1_value & $imm :
$is_ori ? $src1_value | $imm :
$is_xori ? $src1_value ^ $imm :
m5_if_eq(m5_alu_style, 2, ['$is_addi '], ['($is_addi || $is_load || $is_s_instr)']) ? $src1_value + $imm :
$is_slli ? $src1_value << $imm[5:0] :
$is_srli ? $src1_value >> $imm[5:0] :
$is_and ? $src1_value & $src2_value :
$is_or ? $src1_value | $src2_value :
$is_xor ? $src1_value ^ $src2_value :
$is_add ? $src1_value + $src2_value :
$is_sub ? $src1_value - $src2_value :
$is_sll ? $src1_value << $src2_value[4:0] :
$is_srl ? $src1_value >> $src2_value[4:0] :
$is_sltu ? $sltu_rslt :
$is_sltiu ? $sltiu_rslt :
$is_lui ? {$imm[31:12], 12'b0} :
$is_auipc ? $pc + $imm :
$is_jal ? $pc + 32'd4 :
$is_jalr ? $pc + 32'd4 :
$is_srai ? {{32{$src1_value[31]}}, $src1_value} >> $imm[4:0] :
$is_slt ? (($src1_value[31] == $src2_value[31]) ? $sltu_rslt : {31'b0, $src1_value[31]}) :
$is_slti ? (($src1_value[31] == $imm[31]) ? $sltiu_rslt : {31'b0, $src1_value[31]}) :
$is_sra ? {{32{$src1_value[31]}}, $src1_value} >> $src2_value[4:0] :
32'bx;
'])
m5_if(m5_reached(PRAGMAS), /* verilator lint_on WIDTH */)
m4_ifelse_block(m5_br_enable, 1, ['
m5_br_stage
$taken_br = $is_beq ? ($src1_value == $src2_value) :
$is_bne ? ($src1_value != $src2_value) :
$is_blt ? (($src1_value < $src2_value) ^ ($src1_value[31] != $src2_value[31])) :
$is_bge ? (($src1_value >= $src2_value) ^ ($src1_value[31] != $src2_value[31])) :
$is_bltu ? ($src1_value < $src2_value) :
$is_bgeu ? ($src1_value >= $src2_value) :
1'b0;
//`BOGUS_USE($taken_br)
'])
m4_ifelse_block(m5_valid_style, 1, ['
@0
$start = >>1$reset && !$reset;
$valid = $reset ? 1'b0 :
$start ? 1'b1 :
>>3$valid ;
'], m5_valid_style, 2, ['
@3
$valid = $reset ? 1'b0 :
!(>>1$valid_taken_br || >>2$valid_taken_br);
'], m5_valid_style, 3, ['
@3
$valid = $reset ? 1'b0 :
!(>>1$valid_taken_br || >>2$valid_taken_br ||
>>1$valid_load || >>2$valid_load);
'], m5_valid_style, 4, ['
@3
$valid = $reset ? 1'b0 :
!(>>1$valid_taken_br || >>2$valid_taken_br ||
>>1$valid_load || >>2$valid_load ||
>>1$valid_jump || >>2$valid_jump);
'])
@1
m4_ifelse_block(m5_tb_style, 1, ['
*passed = |cpu/xreg[10]>>5$value == (1+2+3+4+5+6+7+8+9);
'], m5_tb_style, 2, ['
*passed = |cpu/xreg[15]>>5$value == (1+2+3+4+5+6+7+8+9);
'], ['
*passed = *top.cyc_cnt > 80;
'])
*failed = 1'b0;
|cpu
m4_ifelse_block(m5_imem_enable, 1, ['
// IMem
m4+imem(@1) // Args: (read stage)
'])
// Args: (read stage, write stage) - if equal, no register bypass is required
m4_ifelse_block(m5_rf_enable, 1, ['
m4+rf(m5_rf_rd_stage, m5_rf_wr_stage)
'])
// ============================================================================================================
// Connect Tiny Tapeout outputs.
// Note that pipesignals assigned here can be found under /fpga_pins/fpga (if in_fpga is set to 1 above).
*uo_out = {6'b0, *failed, *passed};
*uio_out = 8'b0;
*uio_oe = 8'b0;
m5_if_defined_as(MAKERCHIP, 1, ['m4+cpu_viz(@4)']) // For visualisation, argument should be at least equal to the last stage of CPU logic. @4 would work for all labs.
//----------------
\SV
// ================================================
// A simple Makerchip Verilog test bench driving random stimulus.
// Modify the module contents to your needs.
// ================================================
module top(input logic clk, input logic reset, input logic [31:0] cyc_cnt, output logic passed, output logic failed);
// Tiny tapeout I/O signals.
logic [7:0] ui_in, uio_in, uo_out, uio_out, uio_oe;
m5_if(m5_CalcLab, ['logic [31:0] r;'])
m5_if(m5_CalcLab, ['always @(posedge clk) r <= m5_if_defined_as(MAKERCHIP, 1, ['$urandom()'], ['0']);'])
m5_if_eq(m5_LabId, C-TB, [''], ['assign ui_in = m5_ui_in_expr;'])
assign uio_in = 8'b0;
logic ena = 1'b0;
logic rst_n = ! reset;
m4_ifelse_block(m5_LabId, C-TB, ['
initial begin
#1
ui_in = 8'h0;
#10 // Step over reset.
ui_in = 8'h01;
#10
ui_in = 8'h81;
#10
ui_in = 8'h02;
#10
ui_in = 8'h82;
end
'])
// Instantiate the Tiny Tapeout module.
m5_my_design tt(.*);
assign passed = m5_if(m5_CalcLab, ['top.cyc_cnt > 80'], ['uo_out[0]']);
assign failed = m5_if(m5_CalcLab, ['1'b0'], ['uo_out[1]']);
endmodule
// Provide a wrapper module to debounce input signals if requested.
m5_if(m5_debounce_inputs, ['m5_tt_top(m5_my_design)'])
// The above macro expands to multiple lines. We enter a new \SV block to reset line tracking.
\SV
// =======================
// The Tiny Tapeout module
// =======================
module m5_user_module_name (
input wire [7:0] ui_in, // Dedicated inputs - connected to the input switches
output wire [7:0] uo_out, // Dedicated outputs - connected to the 7 segment display
input wire [7:0] uio_in, // IOs: Bidirectional Input path
output wire [7:0] uio_out, // IOs: Bidirectional Output path
output wire [7:0] uio_oe, // IOs: Bidirectional Enable path (active high: 0=input, 1=output)
input wire ena, // will go high when the design is enabled
input wire clk, // clock
input wire rst_n // reset_n - low to reset
);
m5_if(m5_CalcLab, [''], ['logic passed, failed; // Connected to uo_out[0] and uo_out[1] respectively, which connect to Makerchip passed/failed.'])
wire reset = ! rst_n;
// List all potentially-unused inputs to prevent warnings
wire _unused = &{ena, clk, rst_n, 1'b0};
\TLV
// Connect Tiny Tapeout I/Os to Virtual FPGA Lab.
m5+tt_connections()
// Instantiate the Virtual FPGA Lab.
m5+board(/top, /fpga, 7, $, , hidden_solution)
// Label the switch inputs [0..7] (1..8 on the physical switch panel) (top-to-bottom).
m5+tt_input_labels_viz(m5_input_labels)
\SV
endmodule