Initial commit of OpenSPARC T2 design and verification files.

[OpenSPARC-T2-DV] / design / sys / iop / ncu / rtl / ncu_eccchk11_ctl.v

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// 
// OpenSPARC T2 Processor File: ncu_eccchk11_ctl.v
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module ncu_eccchk11_ctl (
  din, 
  ci, 
  ue, 
  ce, 
  dout, 
  co) ;
wire [4:0] e;


input  [10:0]	din;
input  [4:0]	ci;

output		ue;
output		ce;

output [10:0]	dout;
output [4:0]	co;


reg		ue;
reg		ce;
reg [10:0]	dout;
reg [4:0]	co;


assign	e[4] = ^{din[10:0],ci[4:0]} ;
assign	e[3] = ^{din[10:4],ci[3]} ;
assign	e[2] = ^{din[10:7],din[3:1],ci[2]} ;
assign	e[1] = ^{din[10:9],din[6:5],din[3:2],din[0],ci[1]} ;
assign	e[0] = ^{din[10],din[8],din[6],din[4:3],din[1:0],ci[0]} ;

always@(e or din or ci) begin
    dout[10:0]=din[10:0];
    co[4:0]=ci[4:0];
    ue=1'b0;
    ce=1'b1;
    case(e[4:0])
    {1'b0,4'd0} : begin
	          ue=1'b0;
	          ce=1'b0;
	          dout[10:0]=din[10:0];
	          co[4:0]=ci[4:0];
	          end
    {1'b1,4'd0} : co[4]    = ~ci[4];
    {1'b1,4'd1} : co[0]    = ~ci[0];
    {1'b1,4'd2} : co[1]    = ~ci[1];
    {1'b1,4'd3} : dout[0]  = ~din[0];
    {1'b1,4'd4} : co[2]    = ~ci[2];
    {1'b1,4'd5} : dout[1]  = ~din[1];
    {1'b1,4'd6} : dout[2]  = ~din[2];
    {1'b1,4'd7} : dout[3]  = ~din[3];
    {1'b1,4'd8} : co[3]    = ~ci[3];
    {1'b1,4'd9} : dout[4]  = ~din[4];
    {1'b1,4'd10}: dout[5]  = ~din[5];
    {1'b1,4'd11}: dout[6]  = ~din[6];
    {1'b1,4'd12}: dout[7]  = ~din[7];
    {1'b1,4'd13}: dout[8]  = ~din[8];
    {1'b1,4'd14}: dout[9]  = ~din[9];
    {1'b1,4'd15}: dout[10] = ~din[10];
    default : begin
    	      dout[10:0]=din[10:0];
    	      co[4:0]=ci[4:0];
	      ue=1'b1;
	      ce=1'b0;
	      end
    endcase
end

endmodule