后来改用 synopsys 的 arith 和 unsigned 库,依旧不行,换 signed 也不行。 问题 >>nextpow2(4283236186) >>ans=32 在matlab 中可以看到没有超过 32 位的范围。 https://www.fdi.ucm.es/profesor/jjruz/LEC/Temas/Manual Usuario VHDL87.pdf https
先将INTEGER根据需求使用 to_signed(interger,signed'length) 转为 SIGNED 或者使用 to_unsigned(integer,unsigned'length) 转为UNSIGNED，然后使用STD_LOGIC_VECTOR(signed/unsigned)转为整数。例:https://www.nandland.com/vhdl/examples/example-signed-unsigned.html ...
像signed和unsigned类型数据一样的运算。 位(bit)和位矢量(bit_vector):位值用'0'或'1'表示。 例: signal x:bit; 将x声明为一个位宽为1的bit类型的信号。 signal y:bit_vector(3 downto 0); 将y声明为一个位宽为4的位矢量,其中最左边的一位是最高位(MSB:most significant bit)。 signal w:bit_ve...
所以只有一种可能：Ndom语言的数字是6进制。所以mer为6，thef为2，nif是mer的平方即36，...
使用IEEE标准库numeric_std 需要进行两次转换 use ieee.numeric_std.all;根据整数是否有符号 var_logic <= std_logic_vector(to_unsigned(var_integer, var_logic'length));或者 var_logic <= std_logic_vector(to_signed(var_integer, var_logic'length));
a = fi([-pi 0.1 pi],1,8); c = int8(a) c = -3 0 3 Extended Capabilities expand all C/C++ Code Generation Generate C and C++ code using MATLAB® Coder™. HDL Code Generation Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™. ...
Conv_Integer()将SIGNED，UNSIGNED，STD_LOGIC，STD_LOGIC_VECTOR等类型强制转换成整数型 同理Conv_Std_Logic_Vector()是将整形传唤成STD_LOGIC_VECTOR 举个例子 将 STD_LOGIC_VECTOR 与INTEGER 互相转换 两个STD_LOGIC_VECTOR 做＋运算 library IEEE;use IEEE.STD_LOGIC_1164.ALL;use IEEE.STD_LOGIC...
length));或者 var_logic <= std_logic_vector(to_signed(var_integer, var_logic'length));
signal a: std_logic_vector(0 downto 0); signal b : std_logic; you cannot do this, even though the length is only 1: b <= a; you have to do this: b <= a(0); Now, also know that unsigned and signed are also arrays of std_logic, hence why you can...
Convert fi object to signed 8-bit integerSyntax c = int8(a) Description c = int8(a) returns the built-in int8 value of fi object a, based on its real world value. If necessary, the data is rounded-to-nearest and saturated to fit into an int8. ...