我是一个新手，刚编译一个乘法器程序，可总是有问题，不知怎么改，vhdl程序如下:
library IEEE;
use IEEE.Std_logic_1164.all;
ENTITY booth_multiplier IS
GENERIC(k POSITIVE := 7);
PORT(multiplicand, multiplier : IN BIT_VECTOR(k DOWNTO 0);
clock : IN BIT; product : INOUT BIT_VECTOR((2*k + 1) DOWNTO 0));
END booth_multiplier;
ARCHITECTURE structural OF booth_multiplier IS
SIGNAL mdreg, adderout, carries, augend, tcbuffout : BIT_VECTOR(k DOWNTO 0);
SIGNAL mrreg : BIT_VECTOR((k + 1) DOWNTO 0);
SIGNAL adder_ovfl : BIT;
SIGNAL comp ,clr_mr ,load_mr ,shift_mr ,clr_md ,load_md ,clr_pp ,load_pp ,shift_pp : BIT;
SIGNAL boostate : NATURAL RANGE 0 TO 2*(k + 1);
BEGIN
PROCESS
BEGIN
WAIT UNTIL (clock'EVENT AND clock = '1');
IF clr_md = '1' THEN
mdreg <= (OTHERS => '0');
ELSIF load_md = '1' THEN
mdreg <= multiplicand;
ELSE
mdreg <= mdreg;
END IF;
IF clr_mr = '1' THEN
mrreg <= (OTHERS => '0');
ELSIF load_mr = '1' THEN
mrreg((k + 1) DOWNTO 1) <= multiplier;
mrreg(0) <= '0';
ELSIF shift_mr = '1' THEN
mrreg <= mrreg SRL 1;
ELSE
mrreg <= mrreg;
END IF;
IF clr_pp = '1' THEN
product <= (OTHERS => '0');
ELSIF load_pp = '1' THEN
product((2*k + 1) DOWNTO (k + 1)) <= adderout;
product(k DOWNTO 0) <= product(k DOWNTO 0);
ELSIF shift_pp = '1' THEN
product <= product SRA 1;
ELSE
product <= product;
END IF;
END PROCESS;
augend <= product((2*k+1) DOWNTO (k+1));
addgen : FOR i IN adderout'RANGE
GENERATE
lsadder : IF i = 0 GENERATE
adderout(i) <= tcbuffout(i) XOR augend(i) XOR comp;
carries(i) <= (tcbuffout(i) AND augend(i)) OR
(tcbuffout(i) AND comp) OR
(comp AND augend(i));
END GENERATE;
otheradder : IF i /= 0 GENERATE
adderout(i) <= tcbuffout(i) XOR augend(i) XOR carries(i-1);
carries(i) <= (tcbuffout(i) AND augend(i)) OR
(tcbuffout(i) AND carries(i-1)) OR
(carries(i-1) AND augend(i));
END GENERATE;
END GENERATE;
adder_ovfl <= carries(k-1) XOR carries(k);
tcbuffout <= NOT mdreg WHEN (comp = '1') ELSE mdreg;
PROCESS BEGIN
WAIT UNTIL (clock'EVENT AND clock = '1');
IF boostate < 2*(k + 1) THEN boostate <= boostate + 1;
ELSE boostate <= 0;
END IF;
END PROCESS;
PROCESS(boostate)
BEGIN
comp <= '0';
clr_mr <= '0';
load_mr <= '0';
shift_mr <= '0';
clr_md <= '0';
load_md <= '0';
clr_pp <= '0';
load_pp <= '0';
shift_pp <= '0';
IF boostate = 0 THEN
load_mr <= '1';
load_md <= '1';
clr_pp <= '1';
ELSIF boostate MOD 2 = 0 THEN
shift_mr <= '1';
shift_pp <= '1';
ELSE --boostate = 1,3,5,7......
IF mrreg(0) = mrreg(1) THEN
NULL; --refresh pp
ELSE
load_pp <= '1';
END IF;
comp <= mrreg(1);
END IF;
END PROCESS;
END structural;
用max plus2编译显示错误如下:
Error:Unkown problem in e:\myproject\booth_multiplier.vhd[%SynPrep-A-UnexpectedCase,UnexpectedCase:"Unexpected value for tOpClass"in iEvalOperation at line 640 of file readexpr.c.] |
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