| .model top | |
| .inputs clk cen ina inb | |
| .outputs outa outb outc outd | |
| .names $false | |
| .names $true | |
| 1 | |
| .names $undef | |
| .subckt DFFE clk=clk data=ina cen=cen out=ina_n1 | |
| .subckt DFF clk=clk data=ina_n1 out=outa | |
| .subckt DFFN clk=clk data=ina_n1 out=outc | |
| .subckt DFFNE clk=clk data=inb cen=ina out=inb_n1 | |
| .subckt DFF clk=clk data=inb_n1 out=outb | |
| .subckt DFFN clk=clk data=inb_n1 out=outd | |
| .end |