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ProAsic3-Stamp

Stamp Style PCB with ProAsic3 FPGA

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One predecessor of the #DIPSY is this Actel-based prototyping/OEM board.

It may look trivial to build, but it uses the CN132 package of the Actel (Microsemi) ProASIC3 FPGA family. This is one of the worst packages: it is 3 row staggered QFN style package with 0.5mm pitch.

This is near to imposible to get it routed for 2 layers using PCB technology for low cost manufacturing. To my surprise the factory in Taiwan had almost 100% yield with this board.

The trick is that not all the pins are available. Only those that can be "escaped" have external pads. The small size limits the number of pads anyway and 30 GPIO is already more than necessary for many simple applications. Why use a microcontroller when you can reconfigure any pin to do anything at 50MHz ?

The FPGA was pre-programmed with soft-processor based on AVR Instruction set. Of course that was only the "demo" image, the FPGA was reprogrammable in system, the small holes are JTAG.

IMPORTANT: This is completed project, and it is not possible to produce any more 100% same PCB any more as the FPGA in this package is no longer available.

@Yann Guidon / YGDES still has some boards left (for his own prototyping needs) and uses this page to keep the documentation online, now that Mirifica (the last distributor) has shut down the archives.

ST32PA3.pdf

STAMP60 User Manual

Adobe Portable Document Format - 1.00 MB - 04/28/2016 at 05:48

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ST32PA3-AP8.pdf

Manual of the provided AVR-compatible microcontroller

Adobe Portable Document Format - 1.07 MB - 04/28/2016 at 05:43

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  • 1 × A3P060 CN132 Logic ICs / Programmable Logic: FPGAs
  • 1 × LDO 1.5V LDO 1.5V
  • 1 × 50MHz Integrated Oscillator 50MHz
  • 1 × SMD LED, Red 0402 sized SMD LED
  • 1 × 100nF ceramic capacitors

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  • USB to Anything adapter

    Antti Lukats07/25/2015 at 12:39 0 comments

    FT245 + Actel Stamp + RJ45 Connector, all designed to fit low cost plastic enclosure, 2 layer PCB.

    Actel FPGA was programmed with AVR Compatible soft-core that loaded its program from I2C eeprom. FT245 protocol conversion was done by the embedded firmware.

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  • 1

    Take some stamps, some wire and breadboard, and you may have something like this

    Actual prototype of some LED light control system done by YGDES, there are 4 Stamps...

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