. Counter Concepts. VHDL Implementation. Synthesis Considerations.

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Typical Uses For a Verilog counter, see our with example code. Counter Concepts The general idea behind the counter is pretty simple: Start at some initial count value and store it in a register. Increment the counter.

Vhdl

Save the new count value back into the register. The counters that I’m going to implement for you in this VHDL counter example count backwards and forwards from/to 12.

Xilinx Vhdl Download

It may sound strange, but I have a very good reason for counting backwards, and I’ll get into that in the Synthesis Considerations section. After all, it’s just as easy to compute x-1 as it is to compute x+1. The code example implements a 5-bit counter that counts backwards, and two 4-bit counters that count forward–one of which is allowed to free run. 00101 (5) 00100 (4) 00011 (3) 00010 (2) 00001 (1) 00000 (0) 11111 (31) Using this method, we can just watch for the MSB to be equal to 1 to see if we’re done counting. That’s a single logic operation no matter how wide the count register is! Typical Uses Counters are used in almost every logic design.

Fundamentally, they’re the only way to keep track of time in an FPGA, and the uses are endless. A few examples are keeping track of packet sizes when sending data in a protocol, response timeouts, physical button debouncing, etc.

Xilinx Vhdl Tutorial

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