Forum Discussion
Altera_Forum
Honored Contributor
12 years agoI look at Cyclone IV device manual.
http://www.altera.com/literature/hb/cyclone-iv/cyclone4-handbook.pdf It says this: I/O Pins Remain Tri-stated During Power-Up The output buffers of Cyclone IV devices are turned off during system power up or power down. Cyclone IV devices do not drive out until the device is configured and working in recommended operating conditions. The I/O pins are tri-stated until the device enters user mode. So I would conclude that we cannot define/ control the logic high/low state of FPGA output pins before bitmap takes effect. Comments/ corrections are welcome.