函     数     名                                     功           能

STD_LOGIC_1164包集合         

TO_STDLOGICVECTOR(A) 由BIT_VECTOR转换为STD_LOGIC_VECTOR

TO_BITVECTOR(A)           由STD_LOGIC_VECTO转换为BIT_VECTOR

TO_STDLOGIC(A)             由BIT转换成STD_LOGIC

TO_BIT(A)                       由STD_LOGIC转换成BIT

STD_LOGIC_ARITH包集合

CONV_STD_LOGIC_VECTOR(A, 由INTEGER,UNSDGNED,SIGNED转换

位长)                                       STD_LOGIC_VECTOR

CONV_INTEGER(A)                  由UNSIGNED,SIGNED转换成INTEGER

STD_LOGIC_UNSIGNED包含集

CONV_INTEGER(A)                  由STD_LOGIC_VECTOR转换成INTEGER