LF-Building-a-RISC-V-CPU-Core/risc-v_shell.tlv

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2021-02-08 15:40:43 +00:00
\m4_TLV_version 1d: tl-x.org
\SV
2021-02-08 18:53:03 +00:00
// This code can be found in: https://github.com/stevehoover/LF-Building-a-RISC-V-CPU-Core/risc-v_shell.tlv
2021-02-08 15:40:43 +00:00
m4_include_lib(['https://raw.githubusercontent.com/stevehoover/LF-Building-a-RISC-V-CPU-Core/lib/risc-v_shell_lib.tlv'])
\SV
m4_makerchip_module // (Expanded in Nav-TLV pane.)
\TLV
// /====================\
// | Sum 1 to 9 Program |
// \====================/
//
// Program for MYTH Workshop to test RV32I
// Add 1,2,3,...,9 (in that order).
//
// Regs:
// r10 (a0): In: 0, Out: final sum
// r12 (a2): 10
// r13 (a3): 1..10
// r14 (a4): Sum
//
// External to function:
m4_asm(ADD, r10, r0, r0) // Initialize r10 (a0) to 0.
// Function:
m4_asm(ADD, r14, r10, r0) // Initialize sum register a4 with 0x0
m4_asm(ADDI, r12, r10, 1010) // Store count of 10 in register a2.
m4_asm(ADD, r13, r10, r0) // Initialize intermediate sum register a3 with 0
// Loop:
m4_asm(ADD, r14, r13, r14) // Incremental addition
m4_asm(ADDI, r13, r13, 1) // Increment intermediate register by 1
m4_asm(BLT, r13, r12, 1111111111000) // If a3 is less than a2, branch to label named <loop>
m4_asm(ADD, r10, r14, r0) // Store final result to register a0 so that it can be read by main program
m4_asm(ADDI, r1, r0, 101)
m4_asm(ORI, r6, r0, 0)
m4_asm(SW, r6, r1, 0)
m4_asm(LW, r4, r6, 0)
// Optional:
m4_asm(JAL, r7, 11111111111111101000) // 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)
m4_define_hier(['M4_IMEM'], M4_NUM_INSTRS)
m4+fill_imem()
|cpu
@0
$reset = *reset;
// YOUR CODE HERE
// ...
// Note: Because of the magic we are using for visualisation, if visualisation is enabled below,
// be sure to avoid having unassigned signals (which you might be using for random inputs)
// other than those specifically expected in the labs. You'll get strange errors for these.
// Assert these to end simulation (before Makerchip cycle limit).
*passed = *cyc_cnt > 40;
*failed = 1'b0;
// Macro instantiations for:
// o instruction memory
// o register file
// o data memory
// o CPU visualization
|cpu
m4+rf(entries, width, $reset, $port1_en, $port1_index, $port1_data, $port2_en, $port2_index, $$port2_data, $port3_en, $port3_index, $$port3_data)
m4+dmem(entries, width, $reset, $port1_en, $port1_index, $port1_data, $port2_en, $port2_index, $$port2_data)
//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
endmodule