[FRAM71] Pre-Production Batch

[Dave Frederickson]

(06-09-2015 01:32 PM)Hans Brueggemann Wrote:  TL; DR: FlashPro4 needs special programming cable with VJTAG support, otherwise will give error.

I have just received a note from michael that the FlashPro4 programmer is not working on his FFRAM71 when using a programming cable that was made according to dave's suggestions.
the reason is that dave's module, as well some others, but not all modules from the pre-production batch, still has R10, R11 installed (RTFM). the production batch has those resistors removed in order to conserve a couple of microamps in current consumption.
With R10, R11 removed, there is no VJTAG supply to the programmer, and that's why the programmer throws a vjtag error.
Until i have a solution for a programming cable, users who run into this issue can connect CN5:5 to CN3:2 during programming (yep, soldering required and again, RTFM). don't forget to remove the connection after programming is done, will save a bit on battery life.

Hans

Interesting. Are there any other differences between the HW104 modules, besides the programming header being pre-installed on the later batch?

I didn't mention it before, but my cable is wired as follows:

Code:


CN5     SIGNAL    LCPS      FlashPro4
1       GND       11,12     2,10
2       TMS       3         5
3       VPUMP     7,10      7
4       TCK       2         1
5       VJTAG     7,10      6
6       TDI       6         9
7       TRST      8         8
8       TDO       9         3

... and I get the following warning:

Warning: programmer '73735' : Vpump has been selected on programmer AND an externally provided Vpump has also been detected. Using externally provided Vpump voltage source.

The Microsemi datasheet states that the VPUMP provided by the programmer can supply one device and that VPUMP and VJTAG should be provided by separate supplies. Despite this, has connecting pins 6 and 7 on the FlashPro4 end of the cable been tried?

Dave