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Research-Stack/4-Infrastructure/hardware/bram_partial_lut.v

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Verilog
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// BRAM Partial LUT for Morphic DSP
// Implements adaptive storage for pattern matching, weights, thresholds
// Target: Lattice iCE40 HX8K / ECP5
// Q16.16 fixed-point arithmetic
`timescale 1ns / 1ps
// ═══════════════════════════════════════════════════════════════════════════
// BRAM Partial LUT Module
// 1024-entry lookup table (10-bit address, 32-bit Q16.16 data)
// Supports runtime updates via write enable
// ═══════════════════════════════════════════════════════════════════════════
module bram_partial_lut (
input wire clk,
input wire we, // Write enable
input wire [9:0] addr, // Address (1024 entries)
input wire [31:0] din, // Data in (Q16.16)
output reg [31:0] dout // Data out (Q16.16)
);
// BRAM storage (1024 x 32-bit)
reg [31:0] memory [0:1023];
// Read/write operation
always @(posedge clk) begin
if (we) begin
memory[addr] <= din; // Write
end
dout <= memory[addr]; // Read (registered output)
end
endmodule
// ═══════════════════════════════════════════════════════════════════════════
// BRAM Partial LUT with Morphic Scalar Integration
// Morphic scalar amplitudes drive BRAM updates
// ═══════════════════════════════════════════════════════════════════════════
module bram_partial_lut_morphic (
input wire clk,
input wire we, // Write enable
input wire [9:0] addr, // Address
input wire [31:0] din, // Data in
output reg [31:0] dout, // Data out
input wire update_enable, // Morphic scalar update enable
input signed [31:0] morphic_amplitude, // Morphic scalar amplitude
input wire [9:0] pattern_addr, // Pattern address for matching
output wire [31:0] pattern_match_threshold // Pattern match threshold output
);
// BRAM storage
reg [31:0] memory [0:1023];
// Morphic scalar update logic
wire signed [31:0] updated_value;
wire signed [31:0] current_value;
wire signed [31:0] amplitude_scaled;
// Scale morphic amplitude for BRAM update
assign amplitude_scaled = morphic_amplitude >>> 8; // Scale down by 256
// Update calculation: new_value = old_value + scaled_amplitude
assign updated_value = current_value + amplitude_scaled;
// Read current value
assign current_value = memory[addr];
// Read/write operation
always @(posedge clk) begin
if (we) begin
if (update_enable) begin
memory[addr] <= updated_value; // Morphic scalar update
end else begin
memory[addr] <= din; // Direct write
end
end
dout <= memory[addr];
end
// Pattern match threshold lookup
assign pattern_match_threshold = memory[pattern_addr];
endmodule
// ═══════════════════════════════════════════════════════════════════════════
// BRAM Partial LUT for Pattern Matching
// Stores pattern matching thresholds (e.g., 72% match threshold)
// ═══════════════════════════════════════════════════════════════════════════
module bram_pattern_match_lut (
input wire clk,
input wire we,
input wire [9:0] pattern_id, // Pattern identifier
input wire [31:0] match_threshold, // Match threshold (Q16.16, e.g., 0.72 = 72%)
output reg [31:0] current_threshold,
output wire match_detected // Pattern match detected
);
// BRAM storage for pattern thresholds
reg [31:0] pattern_thresholds [0:1023];
always @(posedge clk) begin
if (we) begin
pattern_thresholds[pattern_id] <= match_threshold;
end
current_threshold <= pattern_thresholds[pattern_id];
end
// Simple match detection (threshold >= 0.5)
localparam signed [31:0] MATCH_THRESHOLD = 32'sh00008000; // 0.5 in Q16.16
assign match_detected = (current_threshold >= MATCH_THRESHOLD);
endmodule
// ═══════════════════════════════════════════════════════════════════════════
// BRAM Partial LUT Testbench
// ═══════════════════════════════════════════════════════════════════════════
module bram_partial_lut_tb;
reg clk;
reg we;
reg [9:0] addr;
reg [31:0] din;
wire [31:0] dout;
// Instantiate BRAM partial LUT
bram_partial_lut dut (
.clk(clk),
.we(we),
.addr(addr),
.din(din),
.dout(dout)
);
// Clock generation (50MHz)
initial clk = 0;
always #10 clk = ~clk;
// Test stimulus
initial begin
// Initialize
clk = 0;
we = 0;
addr = 10'd0;
din = 32'd0;
#20;
// Write pattern matching threshold (72% = 0.72 in Q16.16)
#20;
we = 1;
addr = 10'd0;
din = 32'sh0000B851; // 0.72 in Q16.16
#20;
we = 0;
// Read back
#20;
addr = 10'd0;
#20;
$display("Pattern threshold: %d", dout);
// Write another threshold (50% = 0.50 in Q16.16)
#20;
we = 1;
addr = 10'd1;
din = 32'sh00008000; // 0.50 in Q16.16
#20;
we = 0;
// Read back
#20;
addr = 10'd1;
#20;
$display("Pattern threshold: %d", dout);
#100;
$finish;
end
endmodule
// ═══════════════════════════════════════════════════════════════════════════
// MEMS Microphone Interface (SPH0645)
// I2S/PDM digital output interface for acoustic input
// ═══════════════════════════════════════════════════════════════════════════
module mems_mic_interface (
input wire clk, // System clock (27MHz)
input wire mic_clk, // MEMS mic clock (typically 2.4MHz)
input wire mic_data, // MEMS mic data (PDM or I2S)
input wire mic_lr, // Left/Right select (I2S only)
output reg [31:0] audio_sample, // Q16.16 audio sample output
output reg sample_valid // Sample valid flag
output reg [9:0] sample_addr // BRAM address for pattern matching
input wire pattern_we, // Pattern match write enable
input wire [9:0] pattern_addr, // Pattern match address
input [31:0] pattern_threshold // Pattern match threshold
output wire pattern_match // Pattern match detected
);
// PDM to PCM conversion (simplified)
reg [15:0] pdm_accumulator;
reg [7:0] pdm_counter;
always @(posedge mic_clk) begin
pdm_accumulator <= pdm_accumulator + {16'b0, mic_data};
pdm_counter <= pdm_counter + 1;
if (pdm_counter == 8'd255) begin
// Convert to Q16.16 (shift by 16)
audio_sample <= {pdm_accumulator, 16'b0};
sample_valid <= 1'b1;
pdm_accumulator <= 16'b0;
pdm_counter <= 8'b0;
end else begin
sample_valid <= 1'b0;
end
end
// Pattern matching address generation
assign sample_addr = audio_sample[9:0]; // Use lower 10 bits as address
// Pattern match detection
localparam signed [31:0] MATCH_THRESHOLD = 32'sh00008000; // 0.5 in Q16.16
assign pattern_match = (audio_sample >= MATCH_THRESHOLD);
endmodule
// ═══════════════════════════════════════════════════════════════════════════
// BRAM Partial Lut with Morphic Scalar Testbench
// ═══════════════════════════════════════════════════════════════════════════
module bram_partial_lut_morphic_tb;
reg clk;
reg we;
reg [9:0] addr;
reg [31:0] din;
wire [31:0] dout;
reg update_enable;
reg signed [31:0] morphic_amplitude;
reg [9:0] pattern_addr;
wire [31:0] pattern_match_threshold;
// Instantiate BRAM partial LUT with morphic integration
bram_partial_lut_morphic dut (
.clk(clk),
.we(we),
.addr(addr),
.din(din),
.dout(dout),
.update_enable(update_enable),
.morphic_amplitude(morphic_amplitude),
.pattern_addr(pattern_addr),
.pattern_match_threshold(pattern_match_threshold)
);
// Clock generation (50MHz)
initial clk = 0;
always #10 clk = ~clk;
// Test stimulus
initial begin
// Initialize
clk = 0;
we = 0;
addr = 10'd0;
din = 32'd0;
update_enable = 0;
morphic_amplitude = 32'sd0;
pattern_addr = 10'd0;
#20;
// Write initial threshold (72% = 0.72 in Q16.16)
#20;
we = 1;
addr = 10'd0;
din = 32'sh0000B851;
#20;
we = 0;
// Read back
#20;
addr = 10'd0;
#20;
$display("Initial threshold: %d", dout);
// Morphic scalar update (amplitude = 10)
#20;
we = 1;
addr = 10'd0;
update_enable = 1;
morphic_amplitude = 32'sd10; // Amplitude = 10
#20;
we = 0;
update_enable = 0;
// Read back updated threshold
#20;
addr = 10'd0;
#20;
$display("Updated threshold: %d", dout);
// Pattern match lookup
#20;
pattern_addr = 10'd0;
#20;
$display("Pattern match threshold: %d", pattern_match_threshold);
#100;
$finish;
end
endmodule
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