Computing Fixed-Point Square Roots and Their Reciprocals Using Goldschmidt Algorithm
IntroductionA well known algorithm for computing square roots by iteration is provided by the Newton-Raphson Algorithm. The algorithm determines the square root using iteration until the root has been determined to some user-defined level of...
MyHDL synthesis: from browser to FPGA in five seconds
When it comes to feeding (mostly proprietary) synthesis tools, the most widely supported HDL (hardware design language) is probably plain Verilog, then comes VHDL. The reasons for that are simply based on popularity or the fact that VHDL is a...
Use DPLL to Lock Digital Oscillator to 1PPS Signal
Introduction There are occasions where it is desirable to lock a digital oscillator to an external time reference such as the 1PPS (One Pulse Per Second) signal output from a GPS receiver. One approach would be to synchronize a fixed frequency...
Summer of gateware is coming (again)
How time flies! I swear my last post was a summary of the 2015 summer of gateware. This year (2016) MyHDL is participating in the Google summer of code again, for the second year, continuing as a sub-org of the Python...
Makefiles for Xilinx Tools
Building a bitstream from an HDL is a complicated process that requires the cooperation of a lot of tools. You can hide behind an IDE or grow a pair and use command line tools and a makefile to tie your build process together. I am...
I don’t often convert VHDL to Verilog but when I do ...
VHDL to Verilog I don’t often convert VHDL to Verilog but when I do it is not the most exciting task in the world (that is an understatement). For the most part I am HDL agnostic. Well that is not true, I have a strong...
MyHDL @EDAPlayground
Trying out MyHDL became a little easier recently. MyHDL is now avaialbe @EDAPlayground. One can experiment with Python/MyHDL verification of HDL modules and implementing complex digital cirucits in MyHDL. The...
BGA and QFP at Home 1 - A Practical Guide.
It is almost universally accepted by the hobbyists that you can't work with high-density packages at home. That is entirely incorrect. I've been assembling and reflowing BGA circuit boards at home for a few years now. BGAs and...
How FPGAs work, and why you'll buy one
Today, pretty much everyone has a CPU, a DSP and a GPU, buried somewhere in their PC, phone, car, etc. Most don't know or care that they bought any of these, but they did. Will everyone, at some future point, also buy an FPGA? The market size...
StrangeCPU #4. Microcode
Summary: Sliding windows containing runs of microcode. Table of Contents: Part 1: A new CPU - technology review, re-examination of the premises; StrangeCPU concepts; x86 notes. Part 2: Sliding-Window Token Machines, an...
VHDL tutorial - part 2 - Testbench
[quicklinks]In an earlier article I walked through the VHDL coding of a simple design. In this article I will continue the process and create a test bench module to test the earlier design. The Xilinx ISE environment makes it pretty easy to start...
VHDL tutorial
When I was first introduced to "Programmable Logic" several years ago, it was an answer to many of the challenges that I was struggling with. Though the parts were primitive by today's standards (simple PALs verses FPGA), they were an extremely...
VHDL tutorial - A practical example - part 3 - VHDL testbench
In part 1 of this series we focused on the hardware design, including some of the VHDL definitions of the I/O characteristics of the CPLD part. In part 2, we described the VHDL logic of the CPLD for this design. In part...
MyHDL synthesis: from browser to FPGA in five seconds
When it comes to feeding (mostly proprietary) synthesis tools, the most widely supported HDL (hardware design language) is probably plain Verilog, then comes VHDL. The reasons for that are simply based on popularity or the fact that VHDL is a...
Computing Fixed-Point Square Roots and Their Reciprocals Using Goldschmidt Algorithm
IntroductionA well known algorithm for computing square roots by iteration is provided by the Newton-Raphson Algorithm. The algorithm determines the square root using iteration until the root has been determined to some user-defined level of...
I don’t often convert VHDL to Verilog but when I do ...
VHDL to Verilog I don’t often convert VHDL to Verilog but when I do it is not the most exciting task in the world (that is an understatement). For the most part I am HDL agnostic. Well that is not true, I have a strong...
Makefiles for Xilinx Tools
Building a bitstream from an HDL is a complicated process that requires the cooperation of a lot of tools. You can hide behind an IDE or grow a pair and use command line tools and a makefile to tie your build process together. I am...
StrangeCPU #4. Microcode
Summary: Sliding windows containing runs of microcode. Table of Contents: Part 1: A new CPU - technology review, re-examination of the premises; StrangeCPU concepts; x86 notes. Part 2: Sliding-Window Token Machines, an...
StrangeCPU #3. Instruction Slides - The Strangest CPU Yet!
Summary: Decoding instructions with a Sliding Window system. 0-Bit Sliding Register Windows. Table of Contents: Part 1: A new CPU - technology review, re-examination of the premises; StrangeCPU concepts; x86 notes. Part 2:...
StrangeCPU #1. A new CPU
Summary: In this multi-part series I will share with you a design, implementation notes and code for a slightly different kind of a CPU featuring a novel token machine that resolves an 8-bit token to pretty much any address in a 32-bit or even...
