verilog/rtl/mprj_counter.v

module mega_project #(
    parameter IO_PADS = 32,
    parameter BITS = 32
)(
    // Wishbone Slave ports (WB MI A)
    input wb_clk_i,
    input wb_rst_i,
	input wbs_stb_i,
	input wbs_cyc_i,
    input wbs_we_i,
	input [3:0] wbs_sel_i,
    input [31:0] wbs_dat_i,
    input [31:0] wbs_adr_i,
    output wbs_ack_o,
	output [31:0] wbs_dat_o,
    // Logic Analyzer Signals
    input  [127:0] la_data_in,
    output [127:0] la_data_out,
    input  [127:0] la_oen,
    // IOs
    input  [IO_PADS-1:0] io_in,
    output [IO_PADS-1:0] io_out
);
    wire clk;
    wire rst;

    wire [31:0] rdata; 
    wire [31:0] wdata;
    wire [BITS-1:0] count;

    wire valid;
    wire [3:0] wstrb;
    wire [31:0] la_write;

    // WB MI A
    assign valid = wbs_cyc_i && wbs_stb_i; 
    assign wstrb = wbs_sel_i & {4{wbs_we_i}};
    assign wbs_dat_o = rdata;
    assign wdata = wbs_dat_i;

    // IO
    assign io_out = count;

    // LA
    assign la_data_out = {{(127-BITS){1'b0}}, count};
    // Assuming LA probes [63:32] are for controlling the count register  
    assign la_write = ~la_oen[63:32] & ~{BITS{valid}};
    // Assuming LA probes [65:64] are for controlling the count clk & reset  
    assign clk = (~la_oen[64]) ? la_data_in[64]: wb_clk_i;
    assign rst = (~la_oen[65]) ? la_data_in[65]: wb_rst_i;

    counter #(
        .BITS(BITS)
    ) counter(
        .clk(clk),
        .reset(rst),
        .ready(wbs_ack_i),
        .valid(valid),
        .rdata(rdata),
        .wdata(wbs_dat_i),
        .wstrb(wstrb),
        .la_write(la_write),
        .la_input(la_data_in[63:32]),
        .count(count)
    );

endmodule

module counter #(
    parameter BITS = 32
)(
    input clk,
    input reset,
    input valid,
    input [3:0] wstrb,
    input [BITS-1:0] wdata,
    input [BITS-1:0] la_write,
    input [BITS-1:0] la_input,
    output ready,
    output [BITS-1:0] rdata,
    output [BITS-1:0] count
);
    reg ready;
    reg [BITS-1:0] count;
    reg [BITS-1:0] rdata;

    always @(posedge clk) begin
        if (reset) begin
            count <= 0;
            ready <= 0;
        end else begin
            ready <= 1'b0;
            if (~|la_write) begin
                count <= count + 1;
            end
            if (valid && !ready) begin
                ready <= 1'b1;
                rdata <= count;
                if (wstrb[0]) count[7:0]   <= wdata[7:0];
                if (wstrb[1]) count[15:8]  <= wdata[15:8];
                if (wstrb[2]) count[23:16] <= wdata[23:16];
                if (wstrb[3]) count[31:24] <= wdata[31:24];
            end
        end
    end

    genvar i;
    generate 
        for(i=0; i<BITS; i=i+1) begin
          always @(posedge clk) begin
              if (la_write[i]) count[i] <= la_input[i];
          end
        end
    endgenerate

endmodule