Today solved a very basic problem. In the forum, I saw someone asking the following code to report an error: First of all, plus 3'd0 should be 3'b0, otherwise it is followed by t[2:0]opcode; the number of digits cannot correspond to the syntax. There is no problem with the syntax, but the compilation does prompt the error to change `define to reg or parameter. In the end, I understand that the variable defined by `define unegate 4 must be `plus" when it is referenced. Haha, it turned out to be a small `symbol. The window is a double-plane window. After precision grinding and polishing on both sides, the quality of the two planes reaches the optical level of optical glass. It is often used as a protective light-transmitting protective glass for optical detectors, sensors, optical lenses, and detectors. Quartz Window,Sapphire Windows,Caf2 Window,Znse Window Bohr Optics Co.,Ltd , https://www.bohr-optics.com
Define plus 3'd0
`define minus 3'd1
`define band 3'd2
`define bor 3'd3
`define unegate 3'd4
Module alu(opcode,out,a,b);
Input[2:0]opcode;
Input [7:0]a,b;
Output[7:0]out;
Reg[7:0]out;
Always@(opcode or a or b)
Begin
Case(opcode)
Plus:out=a+b;
Minus:out=ab;
Band:out=a&b;
Bor:out=a|b;
Unegate:out=~a;
Default:out=8'hx;
Endcase
End
Endmodule
Display error: Error (10161): Verilog HDL error at alu.v(14): object "plus" is not declared
The window is one of the basic optical components in optics. It is an optical flat panel that protects electronic components/sensors/semiconductor components in the optical path. The window does not change the optical magnification and only affects the optical path in the optical path. Mechanical properties such as light transmittance, surface accuracy, thickness, parallelism, and substrate material are important parameters of the window. You can choose the window with the appropriate parameters according to the specific application. Such as zinc selenide (ZnSe) windows, germanium (Ge) windows, silicon (Si) windows, barium fluoride (BaF2) windows, calcium fluoride (CaF2) in the infrared (NIR/IR) spectral band Windows; Fused Silica windows used in the ultraviolet (UV) spectral band; K9 windows used in the visible light (VIS) spectral band, etc.
November 17, 2021