// Name: John M. Acken
// Date: 17 March 2006
// Description:  decoder inside signature block ECEN 4243 Spring 2006
//          
//
module  decoder4sig(ld, gclock, reset0, sel);

input[4:0] sel;

output reset0, gclock, ld;

wire[31:0] min, MAX;
wire s4not, s3not, s2not, s1not, s0not;
wire turnon, turnoff;

INVX1 jma4(.Y(s4not), .A(sel[4]));
INVX1 jma3(.Y(s3not), .A(sel[3]));
INVX1 jma2(.Y(s2not), .A(sel[2]));
INVX1 jma1(.Y(s1not), .A(sel[1]));
INVX1 jma0(.Y(s0not), .A(sel[0]));

// set minterms.
  and(min[31], sel[4], sel[3], sel[2], sel[1], sel[0]);
and(min[22], sel[4], s3not, sel[2], sel[1], s0not);
and(min[16], sel[4], s3not, s2not, s1not, s0not);

and(min[8], s4not, sel[3], s2not, s1not, s0not);

and(min[2], s4not, s3not, s2not, sel[1], s0not);
and(min[1], s4not, s3not, s2not, s1not, sel[0]);

     and(min[0], s4not, s3not, s2not, s1not, s0not);


NAND2X1 rslatch0(.A(turnon), .B(gnot), .Y(gclock));
NAND2X1 rslatch1(.A(turnoff), .B(gclock), .Y(gnot));

nor(turnoff, min[1], min[22]);
nor(turnon, min[2], min[16], min[8]);
CLKBUF1 loadsig(.Y(ld), .A(min[2]));
CLKBUF1 resetsig(.Y(reset0), .A(min[22]));

endmodule