我正在尝试在VHDL中实现Booth算法,已经运行了“纸质测试”并且代码显然有效,但是当我模拟它时,我没有得到期望的结果......然后我替换了代码做一个A-Shift测试,但是当我模拟我的代码时,我收到了这个错误:
错误(可抑制):( vsim-3601)在180 ns时达到迭代限制5000.
我只是替换了这一行: db.Model
为此: P := STD_LOGIC_VECTOR(unsigned(P) SRA 1);
这是代码atm:
P := P(16) & P(16 downto 1);
答案 0 :(得分:-1)
经过多次尝试后,只需更改此行: P := P(16) & P(16 downto 1);
对于这个: P(16 downto 0) := P(17 downto 1);
问题解决了!
以下是固定代码:
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY algor_booth IS
PORT(oper1 : IN STD_LOGIC_VECTOR(7 DOWNTO 0);
oper2 : IN STD_LOGIC_VECTOR(7 DOWNTO 0);
sel : IN STD_LOGIC;
result : OUT STD_LOGIC_VECTOR(15 DOWNTO 0)
);
END ENTITY;
ARCHITECTURE algor OF algor_booth IS
BEGIN
PROCESS (oper1, oper2)
VARIABLE A, S, P: STD_LOGIC_VECTOR(17 DOWNTO 0);
VARIABLE Ma2: STD_LOGIC_VECTOR(7 DOWNTO 0);
VARIABLE flag: STD_LOGIC;
BEGIN
Ma2 := (NOT oper1) + 1;
A := '0' & oper1 & "00000000" & '0';
S := '0' & Ma2 & "00000000" & '0';
P := '0' & "00000000" & oper2 & '0';
flag := '0';
FOR i IN 1 TO 8 LOOP
IF (P(1) = '0' AND P(0) = '1') THEN
flag := '0';
P(17) := flag;
P := P + A;
ELSIF (P(1) = '1' AND P(0) = '0') THEN
flag := '1';
P(17) := flag;
P := P + S;
END IF;
P(17) := flag;
P(16 downto 0) := P(17 downto 1);
P(17) := flag;
END LOOP;
result <= P(16 DOWNTO 1);
END PROCESS;
END algor;
感谢您的帮助!