Verilog has a better grasp on hardware modeling, but has a lower level of programming constructs. You will end up typing few lines of code and it draws similarities to the C language. In Verilog, the language is more compact, as the Verilog language is more of a hardware modeling language. But maybe that’s just my personal opinion. When you’re coding a program with VHDL, it can seem to flow better. VHDL can also just seem more natural to use at times. With VHDL, you have a higher chance of writing more lines of code. VHDL is more verbose than Verilog and it is also has a non-C like syntax. All values or variables defined in this language must be described by one of the data types. Now, that’s a mouthful if I ever saw one! One of the key features of VHDL is that it is a strongly typed language, which means that each data type (integer, character, or etc.) has been predefined by the language itself. So on the whole VHDL actually stands for Very High Speed Integrated Circuit Hardware Description Language. VHDL stands for VHSIC Hardware Description Language and VHSIC stands for Very High Speed Integrated Circuit. Let’s take a look at these languages and see what the differences are.

I should also mention that there is of course System Verilog, but it is very closely related to Verilog so we’ll just leave that for another day. Many people have different opinions on which language is better, but it really comes down to which language you prefer. Born in 1984, it didn’t make it to the big scene until 1995. In the right corner we have VHDL, the language created by the US Department of Defense in the 1980’s. That will prevent any other always block from being able to see these variables, which will prevent the potential simulation races that would occur if some other always block could see them.With the intense tune of Eye of the Tiger playing in the background, it is time to for this showdown to begin. If you would prefer variable1 and variable2 to be combinational logic then you must use blocking assignments: always_ff sysclk) begin So, in your example code, variable1, variable2 and variable3 will all behave like flip-flops in simulation and hence will become flip-flops after synthesis. A non-blocking assignment within an always_ff block infers a flip-flop.

Corner case for counter fpga simulation