feat(v2): scaffold hardware/v1 frozen baseline + M1 Neural Processor
Begins the V2 Neural Multiprocessor / Dataflow architecture per docs/v2-description.md, per explicit user request to freeze V1 and start V2 development, copying from V1 what's needed. Scaffold: - hardware/v1/: byte-exact, read-only copy of the current V1 codebase (rtl, testbenches, tools, constraints, a representative subset of synthesis results, and reference docs) -- verified identical via diff/cmp against the live top-level tree before being made filesystem-read-only. The live top-level tree is untouched and remains the project's "production" V1 (see hardware/v1/README.md and hardware/v2/logs/decisions.log DEC-0001 for why copy-not-move). - hardware/v2/: mandatory structure (rtl/sim/constraints/synthesis/ reports/scripts/logs/docs) plus the full logging system required by the spec (development/architecture/simulation/synthesis/timing/ benchmark/decisions/experiments/errors.log). M1 -- Neural Processor (hardware/v2/rtl/neural_processor.v): - 8-stage pipelined perceptron unit (P_IN=8): input align, 8 multipliers, 3-level adder tree, accumulator, bias+activation, INT8 saturation. Genuine 1-tile/cycle throughput, not just a wider combinational datapath. - 7-state FSM (NP_IDLE..NP_ERROR per docs/v2-description.md §6, with 4 baseline states merged into NP_WAIT_OPERANDS -- see decisions.log DEC-0002); valid/ready/data/last stream interfaces per §7. - Bit-exact vs the frozen hardware/v1/rtl/neuron_parallel.v + mac8.v + mac_unit.v: 7/7 tests pass (hardware/v2/sim/tb_neural_processor.v), covering regular/mixed-sign/extreme-INT8 vectors, both activations, a zero-idle-gap back-to-back-tiles throughput check, and an 8-tile job -- verified with Verilator (see below for why). - Real synthesis + place&route (Yosys + nextpnr-ecp5): 0 CHECK problems, Fmax 183.12 MHz at ACC_WIDTH=32 (PASS at 80MHz, ~3x V1's isolated PARALLEL=8 Fmax of 61.71 MHz) and 176.21 MHz at ACC_WIDTH=24 (a user-requested comparison experiment, also bit-exact-verified; see experiments.log EXP-0001/EXP-0002 and benchmark.log). Three real bugs found and resolved during M1 development (full diagnostic record in errors.log): - Two independent, reproducible Icarus Verilog v13.0 scheduling defects (ERR-0001, ERR-0002) that silently produced wrong simulation results for standard sequential Verilog -- confirmed via Verilator 5.050 giving correct results on the same minimal repros. Verilator is now the trusted simulator for hardware/v2/ (decisions.log DEC-0004); Icarus's affected protocol-violation check was removed from the RTL and deferred architecturally to the Neural Director (DEC-0003) rather than chased further. - One real RTL bug (ERR-0003): last0 wasn't gated like valid0, letting a "last tile" tag leak into the pipeline ahead of its actual valid tile on back-to-back jobs. Fixed and verified. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013xXuuRUWZScuo1DeYJxs3v
This commit is contained in:
Claude Sonnet 5
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`timescale 1ns/1ps
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module tb;
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parameter DATA_WIDTH = 8;
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parameter N_INPUTS = 32;
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parameter N_NEURONS = 8;
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parameter PARALLEL = 8;
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parameter ACC_WIDTH = 32;
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reg clk;
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reg rst;
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reg start;
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reg signed [DATA_WIDTH*N_INPUTS-1:0] x_bus;
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reg signed [DATA_WIDTH*N_INPUTS*N_NEURONS-1:0]
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weights_bus;
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reg signed [DATA_WIDTH*N_NEURONS-1:0]
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bias_bus;
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wire signed [DATA_WIDTH*N_NEURONS-1:0]
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y_bus;
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wire busy;
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wire done;
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integer i;
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integer errors;
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layer #(
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.DATA_WIDTH(DATA_WIDTH),
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.N_INPUTS(N_INPUTS),
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.N_NEURONS(N_NEURONS),
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.PARALLEL(PARALLEL),
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.ACC_WIDTH(ACC_WIDTH)
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) dut (
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.clk(clk),
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.rst(rst),
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.start(start),
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.x_bus(x_bus),
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.weights_bus(weights_bus),
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.bias_bus(bias_bus),
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.y_bus(y_bus),
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.busy(busy),
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.done(done)
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);
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initial begin
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clk = 0;
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forever #5 clk = ~clk;
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end
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task run_layer;
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begin
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@(posedge clk);
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start = 1;
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@(posedge clk);
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start = 0;
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wait(done == 1);
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@(posedge clk);
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end
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endtask
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initial begin
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$dumpfile("sim/layer.vcd");
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$dumpvars(0, tb);
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rst = 1;
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start = 0;
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x_bus = 0;
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weights_bus = 0;
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bias_bus = 0;
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errors = 0;
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repeat (2) @(posedge clk);
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rst = 0;
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/*
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* Input vector:
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* all inputs = 1
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*/
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for (i = 0; i < N_INPUTS; i = i + 1)
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x_bus[i*DATA_WIDTH +: DATA_WIDTH] = 8'sd1;
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/*
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* Neuron 0:
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* weights = 1
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* bias = 0
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* result = 32
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*/
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for (i = 0; i < N_INPUTS; i = i + 1)
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weights_bus[
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0*N_INPUTS*DATA_WIDTH +
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i*DATA_WIDTH +:
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DATA_WIDTH
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] = 8'sd1;
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bias_bus[0*DATA_WIDTH +: DATA_WIDTH] = 8'sd0;
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/*
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* Neuron 1:
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* weights = 3
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* result = 96
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*/
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for (i = 0; i < N_INPUTS; i = i + 1)
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weights_bus[
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1*N_INPUTS*DATA_WIDTH +
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i*DATA_WIDTH +:
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DATA_WIDTH
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] = 8'sd3;
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/*
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* Neuron 2:
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* weights = -1
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* result = -32 -> ReLU = 0
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*/
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for (i = 0; i < N_INPUTS; i = i + 1)
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weights_bus[
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2*N_INPUTS*DATA_WIDTH +
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i*DATA_WIDTH +:
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DATA_WIDTH
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] = -8'sd1;
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/*
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* Neuron 3:
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* weights = 8
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* result = 256 -> INT8 saturation = 127
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*/
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for (i = 0; i < N_INPUTS; i = i + 1)
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weights_bus[
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3*N_INPUTS*DATA_WIDTH +
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i*DATA_WIDTH +:
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DATA_WIDTH
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] = 8'sd8;
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/*
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* Neuron 4:
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* weights = 0
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* bias = +5
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* result = 5
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*/
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bias_bus[4*DATA_WIDTH +: DATA_WIDTH] = 8'sd5;
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/*
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* Neuron 5:
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* weights = 0
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* bias = -5
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* ReLU = 0
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*/
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bias_bus[5*DATA_WIDTH +: DATA_WIDTH] = -8'sd5;
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/*
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* Neuron 6:
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* weights = 1
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* bias = -10
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* result = 32 - 10 = 22
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*/
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for (i = 0; i < N_INPUTS; i = i + 1)
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weights_bus[
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6*N_INPUTS*DATA_WIDTH +
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i*DATA_WIDTH +:
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DATA_WIDTH
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] = 8'sd1;
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bias_bus[6*DATA_WIDTH +: DATA_WIDTH] = -8'sd10;
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/*
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* Neuron 7:
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* first 16 weights = 1, remaining 16 = 0
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* bias = +5
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* result = 16 + 5 = 21
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*
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* Exercises a sparse weight pattern across groups
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* (PARALLEL = 8 -> GROUPS = 4).
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*/
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for (i = 0; i < N_INPUTS; i = i + 1)
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weights_bus[
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7*N_INPUTS*DATA_WIDTH +
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i*DATA_WIDTH +:
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DATA_WIDTH
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] = (i < 16) ? 8'sd1 : 8'sd0;
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bias_bus[7*DATA_WIDTH +: DATA_WIDTH] = 8'sd5;
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$display("");
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$display("==============================");
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$display("LAYER TEST (INT8)");
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$display("==============================");
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run_layer;
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$display("Neuron 0 = %5d expected = 32", $signed(y_bus[0*DATA_WIDTH +: DATA_WIDTH]));
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$display("Neuron 1 = %5d expected = 96", $signed(y_bus[1*DATA_WIDTH +: DATA_WIDTH]));
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$display("Neuron 2 = %5d expected = 0", $signed(y_bus[2*DATA_WIDTH +: DATA_WIDTH]));
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$display("Neuron 3 = %5d expected = 127", $signed(y_bus[3*DATA_WIDTH +: DATA_WIDTH]));
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$display("Neuron 4 = %5d expected = 5", $signed(y_bus[4*DATA_WIDTH +: DATA_WIDTH]));
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$display("Neuron 5 = %5d expected = 0", $signed(y_bus[5*DATA_WIDTH +: DATA_WIDTH]));
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$display("Neuron 6 = %5d expected = 22", $signed(y_bus[6*DATA_WIDTH +: DATA_WIDTH]));
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$display("Neuron 7 = %5d expected = 21", $signed(y_bus[7*DATA_WIDTH +: DATA_WIDTH]));
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if ($signed(y_bus[0*DATA_WIDTH +: DATA_WIDTH]) !== 8'sd32) errors = errors + 1;
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if ($signed(y_bus[1*DATA_WIDTH +: DATA_WIDTH]) !== 8'sd96) errors = errors + 1;
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if ($signed(y_bus[2*DATA_WIDTH +: DATA_WIDTH]) !== 8'sd0) errors = errors + 1;
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if ($signed(y_bus[3*DATA_WIDTH +: DATA_WIDTH]) !== 8'sd127) errors = errors + 1;
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if ($signed(y_bus[4*DATA_WIDTH +: DATA_WIDTH]) !== 8'sd5) errors = errors + 1;
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if ($signed(y_bus[5*DATA_WIDTH +: DATA_WIDTH]) !== 8'sd0) errors = errors + 1;
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if ($signed(y_bus[6*DATA_WIDTH +: DATA_WIDTH]) !== 8'sd22) errors = errors + 1;
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if ($signed(y_bus[7*DATA_WIDTH +: DATA_WIDTH]) !== 8'sd21) errors = errors + 1;
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$display("busy = %0d", busy);
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$display("done = %0d", done);
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$display("");
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$display("==============================");
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if (errors == 0)
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$display("PASS - ALL 8 NEURONS");
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else
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$display("FAIL - %0d ERRORS", errors);
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$display("==============================");
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$display("LAYER TEST FINISHED");
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$display("");
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$finish;
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end
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endmodule
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