File content as of revision 5:4409ff66b434:

/*----------------------------------copyright---------------------------------*/
//      licensed for personal and academic use.
//      commercial use must be approved by the account-holder of
//      gated.clock@gmail.com
/*-----------------------------------module-----------------------------------*/
        module counter_08
        (
         oCount,                                // counter state.
         iParallel7,                            // parallel-input  data.
         iParallel6,                            // parallel-input  data.
         iParallel5,                            // parallel-input  data.
         iParallel4,                            // parallel-input  data.
         iParallel3,                            // parallel-input  data.
         iParallel2,                            // parallel-input  data.
         iParallel1,                            // parallel-input  data.
         iParallel0,                            // parallel-input  data.
         iSel,                                  // select the parallel input.
         oSerial,                               // serial-output data.
         iSerial,                               // serial-input data.
         iLoadEnable,                           // parallel-load-enable.
         iShiftEnable,                          // serial-shift-enable.
         iCountEnable,                          // count-increment enable.
         iResetN,                               // synchronous reset*.
         iClk                                   // module clock.
        );
/*--------------------------------description-----------------------------------
        an 8-bit preloadable counter.
-------------------------------------notes--------------------------------------
        shifting is LSB->MSB.
------------------------------------defines-----------------------------------*/
/*-----------------------------------ports------------------------------------*/
        output  [ 7:0]  oCount;                 // counter state.
        input   [ 7:0]  iParallel7;             // parallel-input  data.
        input   [ 7:0]  iParallel6;             // parallel-input  data.
        input   [ 7:0]  iParallel5;             // parallel-input  data.
        input   [ 7:0]  iParallel4;             // parallel-input  data.
        input   [ 7:0]  iParallel3;             // parallel-input  data.
        input   [ 7:0]  iParallel2;             // parallel-input  data.
        input   [ 7:0]  iParallel1;             // parallel-input  data.
        input   [ 7:0]  iParallel0;             // parallel-input  data.
        input   [ 2:0]  iSel;                   // select the parallel input.
        output          oSerial;                // serial-output data.
        input           iSerial;                // serial-input data.
        input           iLoadEnable;            // parallel-load-enable.
        input           iShiftEnable;           // serial-shift-enable.
        input           iCountEnable;           // count-increment enable.
        input           iResetN;                // synchronous reset*.
        input           iClk;                   // module clock.
/*-----------------------------------wires------------------------------------*/
        wire    [ 7:0]  oCount;                 // counter state.
        wire    [ 7:0]  iParallel7;             // parallel-input  data.
        wire    [ 7:0]  iParallel6;             // parallel-input  data.
        wire    [ 7:0]  iParallel5;             // parallel-input  data.
        wire    [ 7:0]  iParallel4;             // parallel-input  data.
        wire    [ 7:0]  iParallel3;             // parallel-input  data.
        wire    [ 7:0]  iParallel2;             // parallel-input  data.
        wire    [ 7:0]  iParallel1;             // parallel-input  data.
        wire    [ 7:0]  iParallel0;             // parallel-input  data.
        wire    [ 2:0]  iSel;                   // select the parallel input.
        wire    [ 7:0]  wParallelIn;            // select the parallel input.
        wire            oSerial;                // serial-output data.
        wire            iSerial;                // serial-input data.
        wire            iLoadEnable;            // parallel-load-enable.
        wire            iShiftEnable;           // serial-shift-enable.
        wire            iCountEnable;           // count-increment enable.
        wire            iResetN;                // synchronous reset*.
        wire            iClk;                   // module clock.
/*---------------------------------registers----------------------------------*/
        reg     [ 7:0]  rRegister;              // the counter state.
/*---------------------------------variables----------------------------------*/
/*---------------------------------parameters---------------------------------*/
/*-----------------------------------clocks-----------------------------------*/
/*---------------------------------instances----------------------------------*/
        mux8x8 U01_mux8x8                       // data-input selection.
        (
         .iDin7(iParallel7),
         .iDin6(iParallel6),
         .iDin5(iParallel5),
         .iDin4(iParallel4),
         .iDin3(iParallel3),
         .iDin2(iParallel2),
         .iDin1(iParallel1),
         .iDin0(iParallel0),
         .iSel (iSel),
         .oDout(wParallelIn)
        );
/*-----------------------------------logic------------------------------------*/
        always @ (posedge iClk or negedge iResetN)
        begin
               if (!iResetN)     rRegister <= 8'h00;
          else if (iLoadEnable)  rRegister <= wParallelIn;
          else if (iShiftEnable) rRegister <= {rRegister[6:0], iSerial};
          else if (iCountEnable) rRegister <= rRegister + 1'b1;
          else                   rRegister <= rRegister;
        end

        assign oCount    = rRegister;           // propagate counter state.
        assign oSerial   = rRegister[7];        // propagate serial-out.
/*-------------------------------*/endmodule/*--------------------------------*/