I’m from Norway, but I live in Bangkok, Thailand. Before I started VHDLwhiz, I worked as an FPGA engineer in the defense industry. I earned my master’s degree in informatics at the University of Oslo.
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How to use a function in VHDL
Functions are subprograms in VHDL which can be used for implementing frequently used algorithms. A function takes zero or more input values, and it always returns a value. In addition to the return value, what sets a function apart from a procedure, is that it cannot contain Wait-statements. This means that functions always consume zero…
RC servo controller using PWM from an FPGA pin
Radio-controlled (RC) model servos are tiny actuators typically used in hobbyist model planes, cars, and boats. They allow the operator to control the vehicle via a radio link remotely. Because RC models have been around for a long time, the de-facto standard interface is pulse-width modulation (PWM), rather than a digital scheme. Fortunately, it’s easy…
Using Integrated Logic Analyzer (ILA) and Virtual Input/Output (VIO)
This tutorial covers using the Integrated Logic Analyzer (ILA) and Virtual Input/Output (VIO) cores to debug and monitor your VHDL design in the Xilinx Vivado IDE. In many cases, designers are in need to perform on-chip verification. That is, gaining access to an internal signal’s behavior in their FPGA design for verification purposes. One option…
Basic VHDL quiz – Part 1
Put your skills to the test with this quiz with questions from the first part of the Basic VHDL Tutorial series.
Interactive testbench using Tcl
An interactive testbench is a simulator setup where input to the device under test (DUT) is provided by an operator while the testbench is running. Most often, this would mean you entering commands in the simulator console to provide the DUT with stimulus. While you should always create a self-checking testbench, an interactive testbench can…
How to use an impure function in VHDL
An impure function can read or write any signal within its scope, also those that are not on the parameter list. We say that the function has side effects. What we mean by “side effects” is that it is not guaranteed that the function will return the same value every time it is called with…