[FRAM71] Pre-Production Batch

[Dave Frederickson]

(06-10-2015 07:59 AM)Michael Lopez Wrote:  Thank you so much for identifying (so quickly) the FlashPro4 VJTAG support programming issue with the production version of FRAM71. Sounds like you already have some possible cable modifications that will help us enthusiasts.

The LCPS was never intended to be used without the development board. The dev board provides VPUMP and VJTAG to the LCPS. The blue wire on the programmer in the manual connects 3.3V developed on the LCPS to VPUMP and VJTAG which provides the programming voltage to the FPGA and powers the JTAG block. It wasn't designed to power anything other than the onboard circuitry.

FlashPro 4 and 5 are designed to provide VPUMP to one external device. By connecting pins 6 and 7 on the FlashPro this is doing exactly what is done with the LCPS, except with a beefer 3.3V regulator.

Ideally VPUMP and VJTAG should be provided separately. Installing R11 allows the FRAM71 to provide VJTAG, but at the expense of battery life.

Dave