出现"i is not a constant"(i不是一个常量)的错误是因为作者在索引表达式中使用了非常量的变量。
这个错误的直接原因是 Verilog 不支持 Data_i[i*8-1:i*8-8] 这种语法。如果把向量的位选取写成 v...
这个是用c语言写电路。那个for里面的i需要定义为genvar i;另外从你写的逻辑看,你是希望那个shift_reg不断的变化,但是你这么写的话。系统会认为是一个组合逻辑,所以会立刻计算出结果。你需要写成时续逻辑的电路,用always @(posedge clk)begin ...end ...
assign 不能放在if里,除非是generate if。如果用always,就不能用assign
I am trying to make a simple for loop to add up a parameterizable count of numbers, all in the same clock cycle( I am aware that this may not fit in a single cycle, I may split it up later to more cycles if timing issues arise.). What I am trying ...
if (I_en == 1) R_data<=I_data; end 有以下告警(用synplify综合) (1)Incomplete sensitivity list - assuming completeness (2) Referenced variable I_en is not insensitivitylist (3) Referenced variable I_data is not in sensitivitylist (4) Latch generated from always block for signal 如果改alw...
晕,你要给count赋值就要把count定义成reg型的,不能定义成integer(整数型),改成reg[31:0]count试试。
使用verilog写的代码,在ISE综合时产生的警告中FSM_FFd6是什么意思FF/Latch (without init value) has a constant value of 0 in block .This FF/Latch will be trimmed during the optimization process.FSM应该是有限状态机的意思吧,那FFd呢?怎么能看出是哪个状态没有用到 答案 因为你的逻辑中,不会用到state...
12、ARCHITECTURE 结构体名 ;常数常数 CONSTANT a: INTEGER:=15; 信号信号 SIGNAL b: STD_LOGIC;COMPNENT cnt10PORT();进程语句进程语句 PROCESS信号赋值语句信号赋值语句 b THEN RETURN a;ELSE RETURN b;END IF;END FUNCTION max;9.3 子程序1. 子程序函数调用示例out1 value value value = “1111” ;END ...
// Transparent latch examplereglatch_out;always@(gateordin)if(gate)latch_out=din;// Pass through state// Note that the else isn't required here. The variable// latch_out will follow the value of din while gate is// high. When gate goes low, latch_out will remain constant. ...