frame_num_sync.v

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`timescale 1ns/1ps

module  frame_num_sync  #(
    parameter NUM_FRAME_BITS = 4,
    parameter LAST_FRAME_BITS = 16,
    parameter FRAME_BITS_KEEP = 4    // number of bits from mcntrl frame number used to index absolute sensor frame number 
)(
// SuppressWarnings VEditor unused 
    input                             mrst,
    input                             mclk, // for command/status
    input      [NUM_FRAME_BITS*4-1:0] absolute_frames,          // per-channel current sensor frame number
    input                       [3:0] first_wr_in_frame,        // sensor writes first block in a frame
//    input                     [3:0] first_rd_in_frame,        // compressor gets first block in a frame
    input     [4*LAST_FRAME_BITS-1:0] memory_frames_sensor,     // 4 channels of frame numbers as defined for memory allocation
    input     [4*LAST_FRAME_BITS-1:0] memory_frames_compressor, // 4 channels of frame numbers as defined for memory allocation, valid after compression (before done)
    output reg [NUM_FRAME_BITS*4-1:0] compressed_frames         // frame numbers valid at compressor done (TODO: keep until IRQ cleared? pointers will change anyway) 
);
    reg      [NUM_FRAME_BITS-1:0] frames_ram0[0: (1<<FRAME_BITS_KEEP) -1];
    reg      [NUM_FRAME_BITS-1:0] frames_ram1[0: (1<<FRAME_BITS_KEEP) -1];
    reg      [NUM_FRAME_BITS-1:0] frames_ram2[0: (1<<FRAME_BITS_KEEP) -1];
    reg      [NUM_FRAME_BITS-1:0] frames_ram3[0: (1<<FRAME_BITS_KEEP) -1];
    always @ (posedge mclk) begin
        if (first_wr_in_frame[0]) frames_ram0[memory_frames_sensor[0*LAST_FRAME_BITS+:FRAME_BITS_KEEP]] <= absolute_frames[0*NUM_FRAME_BITS +: NUM_FRAME_BITS];
        if (first_wr_in_frame[1]) frames_ram1[memory_frames_sensor[1*LAST_FRAME_BITS+:FRAME_BITS_KEEP]] <= absolute_frames[1*NUM_FRAME_BITS +: NUM_FRAME_BITS];
        if (first_wr_in_frame[2]) frames_ram2[memory_frames_sensor[2*LAST_FRAME_BITS+:FRAME_BITS_KEEP]] <= absolute_frames[2*NUM_FRAME_BITS +: NUM_FRAME_BITS];
        if (first_wr_in_frame[3]) frames_ram3[memory_frames_sensor[3*LAST_FRAME_BITS+:FRAME_BITS_KEEP]] <= absolute_frames[3*NUM_FRAME_BITS +: NUM_FRAME_BITS];
        compressed_frames[0*NUM_FRAME_BITS +: NUM_FRAME_BITS] <= frames_ram0[memory_frames_compressor[0*LAST_FRAME_BITS+:FRAME_BITS_KEEP]];
        compressed_frames[1*NUM_FRAME_BITS +: NUM_FRAME_BITS] <= frames_ram1[memory_frames_compressor[1*LAST_FRAME_BITS+:FRAME_BITS_KEEP]];
        compressed_frames[2*NUM_FRAME_BITS +: NUM_FRAME_BITS] <= frames_ram2[memory_frames_compressor[2*LAST_FRAME_BITS+:FRAME_BITS_KEEP]];
        compressed_frames[3*NUM_FRAME_BITS +: NUM_FRAME_BITS] <= frames_ram3[memory_frames_compressor[3*LAST_FRAME_BITS+:FRAME_BITS_KEEP]];
    end


endmodule

//    wire   [4*LAST_FRAME_BITS-1:0] cmprs_frame_number_src;// input[15:0] current frame number (for multi-frame ranges) in the source (sensor) channel