Fri 03 February 2017 / Dave Vandenbout

A Taste of Hierarchy

In my previous blog posts, the SKiDL circuit descriptions were flat. In this post, I'll show a bit of how to describe a circuit hierarchically.

Hierarchy is typically used when there is some subcircuit that needs to be replicated several times or which can serve as a module in several …

Wed 25 January 2017 / Dave Vandenbout

Names, Not Numbers

In my previous post, I showed how to use SKiDL to describe the circuit for a simple USB-to-JTAG interface circuit. That circuit used a PIC32MX microcontroller in a 28-pin SSOP package:

PIC32MX in a 28-pin SSOP package.

and the corresponding SKiDL code was: 

pic32 = Part(pic32_lib, 'pic32MX2\*0F\*\*\*B-SSOP28-SOIC28-SPDIP28',
             footprint='Housings_SSOP:SSOP-28_5.3x10.2mm_Pitch0.65mm')

I …

Thu 19 January 2017 / Dave Vandenbout

Building a USB-to-JTAG Interface Using SKiDL

This post describes using SKiDL for a USB-to-JTAG interface that was taken all the way from concept to physically building a device.

Assembled USB-to-JTAG board.

The interface is pretty simple. It's built from the following stuff:

  • A PIC32MX220 microcontroller.
  • A 12 MHz crystal.
  • Some reset circuitry.
  • A six-pin Microchip programming header (for the …
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