[Coco] 6809 FPGA Success

[Mark McDougall]

On 29/09/2015 12:59 PM, Bill Nobel wrote:

> Most of the time when I program the Nano, I get a flaky VGA, it flashes
> the image in and out.  When i get the image I can see what I typed, but
> very unstable display, until I get a good programming that boots
> properly.

FPGA (ALtera Cyclone) bitstream packets are protected with CRC so it's very 
highly unlikely that the device is being configured with a corrupt 
bitstream, regardless of underlying OS layers.

Not knowing anything about your design, I would actually suspect it could be 
an issue with your start-up logic. Are you generating a POR (power-on-reset) 
in your design and holding that for several hundred clocks (at least) to 
reset all the elements of your design?

Regards,

-- 
|              Mark McDougall                | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"