counter.pcf

该源码为xilinx ise教程的附带光盘源码

//! **************************************************************************
// Written by: Map J.30 on Tue Dec 12 08:56:05 2006
//! **************************************************************************

SCHEMATIC START;
NET "clk_BUFGP/IBUFG" BEL "clk_BUFGP/BUFG.GCLKMUX" USELOCALCONNECT;
TIMEGRP clk = BEL "cnt_0" BEL "cnt_1" BEL "cnt_2" BEL "cnt_3" BEL "cnt_4" BEL
        "cnt_5" BEL "cnt_6" BEL "cnt_7" BEL "cnt_8" BEL "cnt_9" BEL "cnt_10"
        BEL "cnt_11" BEL "cnt_12" BEL "cnt_13" BEL "cnt_14" BEL "cnt_15" BEL
        "cnt_16" BEL "cnt_17" BEL "cnt_18" BEL "cnt_19" BEL "cnt_20" BEL
        "cnt_21" BEL "cnt_22" BEL "cnt_23" BEL "cnt_24" BEL "cnt_25" BEL
        "cnt_26" BEL "cnt_27" BEL "cnt_28" BEL "cnt_29" BEL "cnt_30" BEL
        "cnt_31" BEL "cnt_32" BEL "cnt_33" BEL "cnt_34" BEL "cnt_35" BEL
        "cnt_36" BEL "cnt_37";
TS_clk = PERIOD TIMEGRP "clk" 10 ns HIGH 50%;
SCHEMATIC END;