////////////////////////////////////////////////////////////////////////
//
// Project Reality
//
// module:	cc_inc4
// description:	4 bit incrementer, with carry in and out.
//
// designer:	Phil Gossett
// date:	6/26/94
//
////////////////////////////////////////////////////////////////////////

module cc_inc4 (a, ci, co, s);

input [3:0] a;
input ci;

wire [2:0] c;

output co;
output [3:0] s;

xo02d1h xos0 (.a1(ci),   .a2(a[0]), .z(s[0]));
an02d1h anc0 (.a1(ci),   .a2(a[0]), .z(c[0]));
xo02d1h xos1 (.a1(c[0]), .a2(a[1]), .z(s[1]));
an02d1h anc1 (.a1(c[0]), .a2(a[1]), .z(c[1]));
xo02d1h xos2 (.a1(c[1]), .a2(a[2]), .z(s[2]));
an02d1h anc2 (.a1(c[1]), .a2(a[2]), .z(c[2]));
xo02d1h xos3 (.a1(c[2]), .a2(a[3]), .z(s[3]));
an02d1h anca (.a1(c[0]), .a2(a[1]), .z(ca));
an02d1h ancb (.a1(c[1]), .a2(a[2]), .z(cb));
an02d1h anco (.a1(ca),   .a2(cb),   .z(co));

endmodule // cc_inc4