Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

2nd VGA output from DE1

I have a design which can output either a) text screen, 1 bit R, 1 bit G, 1 bit B, at 60Hz b) graphics screen, 4 bit R, 4 bit G, 4 bit B, at 50Hz or 60Hz to the VGA connector, and I have one o...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I have successfully done this now, using the DE1 schematic as a guide.

The write-up will appear at http://www.nyangau.org/rememotech/rememotech.htm on the Hardware page.

One big gotcha. Surprised not to see it mentioned elsewhere:

Beware of plugging in 40 pin IDE/ATA/UDMA cables into the GPIO sockets.

These cables short together certain pins (which are all GND).

I have several of these cables, from various sources, and they all do it.

Had me confused for hours.

I switched to using a different cable - all working now.

{{{ Andy