_primary.vhd

Xilinx的modelsim 仿真库！里面有许多库函数

library verilog;
use verilog.vl_types.all;
entity bscan_virtex is
    generic(
        cds_action      : string  := "ignore"
    );
    port(
        tdo1            : in     vl_logic;
        tdo2            : in     vl_logic;
        drck1           : out    vl_logic;
        drck2           : out    vl_logic;
        reset           : out    vl_logic;
        sel1            : out    vl_logic;
        sel2            : out    vl_logic;
        shift           : out    vl_logic;
        tdi             : out    vl_logic;
        update          : out    vl_logic
    );
end bscan_virtex;