/**

  Takes a value and many registers and writes the value to one specified register

*/


module registerMultiplex (
    input clk,  // clock
    input rst,  // reset
    
    
    input selection[3], //which register? see node.luc for enumeration
    
    output acc[GNode.WORDLEN],
    output up[GNode.WORDLEN],
    output right[GNode.WORDLEN],
    output down[GNode.WORDLEN],
    output left[GNode.WORDLEN],
    input lastadr[GNode.REGISTERADDRLEN], //CAUTION! JUST AN ADDRESS!
    output any[GNode.WORDLEN],
    
    output acc_w,
    output up_w,
    output right_w,
    output down_w,
    output left_w,
    output any_w,
    
    input in[GNode.WORDLEN],
    input write
  ) {

  always {
    acc_w   = write && selection == 1;
    up_w    = write && selection == 2;
    right_w = write && selection == 3;
    down_w  = write && selection == 4;
    left_w  = write && selection == 5;
    any_w   = write && selection == 7;
    
    acc   = selection == 1 ? in : 0;
    up    = selection == 2 ? in : 0;
    right = selection == 3 ? in : 0;
    down  = selection == 4 ? in : 0;
    left  = selection == 5 ? in : 0;
    any   = selection == 7 ? in : 0;
    
    if(write && selection == 6) {
      //last register
      
      //TODO: this
    }
  }
}