Added SMA and tb

Author: pConst

moving_average.sv

@@ -0,0 +1,81 @@
+//------------------------------------------------------------------------------
+// moving_average.sv
+// Konstantin Pavlov, pavlovconst@gmail.com
+//------------------------------------------------------------------------------
+
+// INFO ------------------------------------------------------------------------
+//  Simple moving average implementation in SystemVerilog
+//
+//  Features:
+//  - configurable depth and data width
+//  - DEPTH doesnt have to be a power of two, but 2^N implementations are
+//       the most efficient
+//  - can be configured to implement in cells or block RAM
+//
+
+
+/* --- INSTANTIATION TEMPLATE BEGIN ---
+
+moving_average #(
+  .DEPTH( 12 ),
+  .DATA_W( 32 )
+) MA (
+  .clk( clk ),
+  .nrst( 1'b1 ),
+  .ena( 1'b1 ),
+
+  .id(  ),
+  .od(  )
+);
+
+--- INSTANTIATION TEMPLATE END ---*/
+
+module moving_average #( parameter
+  DEPTH = 12,                         // DEPTH doesnt have to be a power of two
+  DEPTH_W = $clog2(DEPTH),
+
+  DATA_W = 32                         // data field width
+)(
+
+  input clk,                          // clock
+  input nrst,                         // inverted reset
+  input ena,                          // data enable
+
+  input [DATA_W-1:0] id,              // data input
+  output logic [DATA_W-1:0] od        // averaged data output
+);
+
+
+  logic [DATA_W-1:0] id_delayed;
+  delay #(
+      .LENGTH( DEPTH ),
+      .WIDTH( DATA_W ),
+      .TYPE( "CELLS" )                // "ALTERA_BLOCK_RAM" infers block ram
+  ) delay_data_buf (                  //   "ALTERA_TAPS" infers altshift_taps
+      .clk( clk ),                    //   all other values infer registers
+      .nrst( nrst ),
+      .ena( ena ),
+
+      .in( id[DATA_W-1:0] ),
+      .out( id_delayed[DATA_W-1:0] )
+  );
+
+  logic [DATA_W-1+DEPTH_W:0] moving_summ = '0;  // considering width expansion
+  always_ff @(posedge clk) begin
+    if( ~nrst ) begin
+      moving_summ[DATA_W-1+DEPTH_W:0] <= '0;
+    end else if( ena ) begin
+      moving_summ[DATA_W-1+DEPTH_W:0] <=
+            ( moving_summ[DATA_W-1+DEPTH_W:0] +
+              id[DATA_W-1:0] -                  // adding new item
+              id_delayed[DATA_W-1:0]);          // subtracting the last one
+    end
+  end
+
+  always_comb begin
+    // when DEPTH is a power of two, division turns out like a simple bit-shift
+    od[DATA_W-1:0] <= moving_summ[DATA_W-1+DEPTH_W:0] / DEPTH;
+  end
+
+endmodule
+

moving_average_tb.sv

@@ -0,0 +1,126 @@
+//------------------------------------------------------------------------------
+// moving_average_tb.sv
+// Konstantin Pavlov, pavlovconst@gmail.com
+//------------------------------------------------------------------------------
+
+// INFO ------------------------------------------------------------------------
+// testbench for moving_average.sv module
+//
+
+`timescale 1ns / 1ps
+
+module moving_average_tb();
+
+logic clk200;
+initial begin
+  #0 clk200 = 1'b0;
+  forever
+    #2.5 clk200 = ~clk200;
+end
+
+// external device "asynchronous" clock
+logic clk33;
+initial begin
+  #0 clk33 = 1'b0;
+  forever
+    #15.151 clk33 = ~clk33;
+end
+
+logic rst;
+initial begin
+  #0 rst = 1'b0;
+  #10.2 rst = 1'b1;
+  #5 rst = 1'b0;
+  //#10000;
+  forever begin
+    #9985 rst = ~rst;
+    #5 rst = ~rst;
+  end
+end
+
+logic nrst;
+assign nrst = ~rst;
+
+logic rst_once;
+initial begin
+  #0 rst_once = 1'b0;
+  #10.2 rst_once = 1'b1;
+  #5 rst_once = 1'b0;
+end
+
+logic nrst_once;
+assign nrst_once = ~rst_once;
+
+logic [31:0] DerivedClocks;
+clk_divider #(
+  .WIDTH( 32 )
+) cd1 (
+  .clk( clk200 ),
+  .nrst( nrst_once ),
+  .ena( 1'b1 ),
+  .out( DerivedClocks[31:0] )
+);
+
+logic [31:0] E_DerivedClocks;
+edge_detect ed1[31:0] (
+  .clk( {32{clk200}} ),
+  .nrst( {32{nrst_once}} ),
+  .in( DerivedClocks[31:0] ),
+  .rising( E_DerivedClocks[31:0] ),
+  .falling(  ),
+  .both(  )
+);
+
+logic [15:0] RandomNumber1;
+c_rand rng1 (
+  .clk(clk200),
+  .rst(rst_once),
+  .reseed(1'b0),
+  .seed_val(DerivedClocks[31:0]),
+  .out( RandomNumber1[15:0] )
+);
+
+logic start;
+initial begin
+  #0 start = 1'b0;
+  #100 start = 1'b1;
+  #20 start = 1'b0;
+end
+
+// Module under test ==========================================================
+
+logic [15:0] seq_cntr = '0;
+
+logic [31:0] id = '0;
+always_ff @(posedge clk200) begin
+  if( ~nrst_once ) begin
+    seq_cntr[15:0] <= '0;
+    id[31:0] <= '0;
+  end else begin
+    // incrementing sequence counter
+    if( seq_cntr[15:0]!= '1 ) begin
+      seq_cntr[15:0] <= seq_cntr[15:0] + 1'b1;
+    end
+
+    if( seq_cntr[15:0]<300 ) begin
+      id[31:0] <= '1;
+      //id[31:0] <= {4{RandomNumber1[15:0]}};
+    end else begin
+      id[31:0] <= '0;
+    end
+  end
+end
+
+moving_average #(
+  .DEPTH( 255 ),
+  .DATA_W( 32 )
+) MA (
+  .clk( clk200 ),
+  .nrst( nrst_once ),
+  .ena( 1'b1 ),
+
+  .id( id[31:0] ),
+  .od(  )
+);
+
+endmodule