mcntrl_buf_wr.v

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`timescale 1ns/1ps

module  mcntrl_buf_wr #(
    parameter integer LOG2WIDTH_WR = 5   // WIDTH= 1  << LOG2WIDTH
 ) (
      input                           ext_clk,
      input       [14-LOG2WIDTH_WR:0] ext_waddr,    // external write address
      input                           ext_we,       // external write enable
      input [(1 << LOG2WIDTH_WR)-1:0] ext_data_in,  // data input
      
      input                           rclk,         // mclk
      input                     [1:0] rpage_in,     // will register to wclk, input OK with mclk
      input                           rpage_set,    // set internal read page to rpage_in 
      input                           page_next,    // advance to next page (and reset lower bits to 0)
      output                    [1:0] page,         // current internal page   
      input                           rd,           // read buffer to memory, increment read address (regester enable will be delayed)
      output                   [63:0] data_out      // data out

);
    reg  [1:0] page_r;
    reg  [6:0] raddr;
    reg        regen;
    assign page=page_r;
    always @ (posedge rclk) begin
        regen <= rd;
        
        if      (rpage_set) page_r <= rpage_in;
        else if (page_next) page_r <= page_r+1;

        if      (page_next || rpage_set) raddr <= 0;
        else if (rd)                     raddr <= raddr+1;
    end

    ram_var_w_var_r #(
        .REGISTERS(1),
        .LOG2WIDTH_WR(LOG2WIDTH_WR),
        .LOG2WIDTH_RD(6)
    ) ram_var_w_var_r_i (
        .rclk     (rclk),           // input
        .raddr    ({page_r,raddr}), // input[8:0] 
        .ren      (rd),             // input
        .regen    (regen),          // input
        .data_out (data_out),       // output[63:0] 
        .wclk     (ext_clk),        // input
        .waddr    (ext_waddr),      // input[9:0] 
        .we       (ext_we),         // input
        .web      (8'hff),          // input[3:0] 
        .data_in  (ext_data_in)     // input[31:0] 
    );
endmodule