Search - LookUpTable

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[VHDL-FPGA-Verilog] 4v2 DL : 0: ENTITY maj IS PORT(a,b,c : IN BIT m : OUT BIT) END maj --Dataflow style architecture --Behavioural style architecture using a look-up table ARCHITECTURE using_table OF maj IS BEGIN PROCESS(a,b,c) CONSTANT lookuptable : BIT_VECTOR(0 TO 7) := "00010111" VARIABLE index : NATURAL BEGIN index := 0 --index must be cleared each time process executes IF a = 1 THEN index := index + 1 END IF IF b = 1 THEN index := index + 2 END IF IF c = 1 THEN index := index + 4 END IF m <= lookuptable(index) END PROCESS END using_table ------------------3,5,6,7 is 1 so 110 101 011 111 is 1-ENTITY maj IS PORT(a,b,c : IN BIT m : OUT BIT) END maj --Dataflow style architecture --Behavioural style architecture using a look-up table ARCHITECTURE using_table OF maj IS BEGIN PROCESS(a,b,c) CONSTANT lookuptable : BIT_VECTOR(0 TO 7) := "00010111" VARIABLE index : NATURAL BEGIN index := 0 --index must be cleared each time process executes IF a = 1 THEN index := index+ 1 END IF IF b = 1 THEN index := index+ 2 END IF IF c = 1 THEN index := index+ 4 END IF m <= lookuptable(index) END PROCESS END using_table ------------------3,5,6,7 is 1 so 110 101 011 111 is 1
Date : 2026-01-02 Size : 134kb User : 赵中原