请问大虾,在MAX+PLUS(10.0)里是不是不支持此语句q(i) MAX, 大虾, PLUS, 语句

ljp

请问大虾,在MAX+PLUS(10.0)里是不是不支持此语句q(i) <= q(i-1);?具体请见程序 library IEEE; use IEEE.Std_logic_1164.all; ENTITY SHIFT164 IS PORT(a, b, nclr, clock : IN BIT; q : BUFFER BIT_VECTOR(0 TO 7)); END SHIFT164; ARCHITECTURE version1 OF SHIFT164 IS BEGIN PROCESS(a,b,nclr,clock) BEGIN IF nclr??= '0' THEN q <= "00000000"; ELSE IF clock'EVENT AND clock = '1' THEN FOR i IN q'RANGE LOOP IF i = 0 THEN q(i) <= (a AND b); ELSE q(i) <= q(i-1); END IF; END LOOP; END IF; END IF; END PROCESS; END version1; 在验证时总是出错index value(-1)is out of the bounds for VHDL object 'q[o-7]'