Parallel_to_Serial

Parallel to Serial

Design and verify a 4-bit parallel to serial converter with valid and empty indications

Interface Definition

The module should have the following interface:

module Parallel_to_Serial
    input     wire      clk,
    input     wire      reset,

    output    wire      empty_o,    // Should be asserted when all of the bits are given out serially
    input     wire[3:0] parallel_i, // Parallel input vector
    
    output    wire      serial_o,   // Serial bit output
    output    wire      valid_o     // Serial bit is valid

Working description

• When the circuit is reset, the shift register, count and output registers are cleared, and the empty_o_reg is set to 1 indicating no data is being transmitted.

• When count is 0, new parallel data is loaded and serial transmission begins. During this transmission, LSB of shift_reg is set to serial_o. Output is valid hence its set to 1, shifting takes place and count is decremented. When transmission is completed, output is made empty.