The Parallax Propeller MCU runs in 3 different flavors. A DIP-40 package (P8X32A-D40), a LQFP-44 package (P8X32A-Q44), and a QFN-44 package (P8X32A-M44). This appnote covers the two SMD packages; LQFP-44 and QFN-44.
The schematic is fairly simple as its just to show a typical layout of for the Propeller. The part number for the crystal is a 6MHz which will run the Propeller at 96MHz. It is a common HC-49/US package so the standard 5MHz type crystal can be used with this layout.
I made a special footprint that can use both the P8X32A-Q44 and P8X32A-M44. This way a part shortage on either package won’t hurt production. I made sure to leave plenty of room around the chip and supporting circuitry for easy fanout of the I/O. Just make sure to route away from the X0 and X1 crystal I/O to reduce EMF.
Files can be found on the GitHub repository and the footprint itself can be found in the my Eagle Library.
Someone on the prop forums referred to your sample prop design. I noticed that you do not have the ground pin connected adjacent to the xtal pin. However, I noticed on your OctoProber board this has been corrected.
Regards,
Cluso99
Good catch! Seems Eagle didn’t fill in that route for me. Will be fixing it shortly.
Ray I got it fixed. Might have to CTRL-F5 to get the image to re-cache.