Technology Blogs

We play with technology. Sometimes we discover things we think are worth sharing.
Adder Trees Pipelined Efficiently by Recursion
VHDL

Adder Trees Pipelined Efficiently by Recursion

Amusing myself with recursive structures in HDL that are entirely synthesisable and optimal in both size and clock speed. This is primarily a hierarchical construction problem made interesting by having to copy with a non-balance tree.
Notes on Fixing Hold Time Violations
FPGA

Notes on Fixing Hold Time Violations

Gathering advice on how to fix hold time violations with an emphasis on FPGA design.
Cygwin Mirror and Installation
Bash

Cygwin Mirror and Installation

Ensuring that your whole team has the same repeatable installation of Cygwin. How to mirror Cygwin on to local infrastructure such that you can script the installation to be the same for everyone.
Comparison of ModelSim 'Signal Spies' and VHDL 'External Signals'
VHDL

Comparison of ModelSim 'Signal Spies' and VHDL 'External Signals'

Example uses of ModelSim's Signal Spies and VHDL-2008's External Signals.
Using Python Decorators
Python

Using Python Decorators

A python decorator allows you to remove repeated code by passing function into another function which extends it.
Deriving AXI Crossbar Address Maps
FPGA

Deriving AXI Crossbar Address Maps

Some tips and tricks for correctly decoding an AXI crossbar address map.
Resilient Xilinx Vivado Licence Acquisition
FPGA

Resilient Xilinx Vivado Licence Acquisition

Our design team has recently observed that Vivado has been struggling to get a licence later into long running compilations. These are some of the ideas I have developed to try and monitor the problem and make our compilations resilient to licence…
Automating Code Review Design Checks in Vivado
FPGA

Automating Code Review Design Checks in Vivado

Automating checks for transparent latches, asynchronous resets, no resets in Xilinx's Vivado synthesis tool.
Writing a simple Garmin app for my watch
Garmin-ConnectIQ

Writing a simple Garmin app for my watch

I am going to be writing an app for my watch to control my family's amplifier.