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Altera_Forum's avatar
Altera_Forum
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16 years ago

Can't resolve multiple constant drivers?

Hi, ive been trying to compile the code below in quartus II v9.0 and i get the following error message Error (10028): Can't resolve multiple constant drivers for net "LSD_SEG[0]" at KEYBOARD.VHD(385)...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

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Hi,

I'm not a real VHDl expert, but as far as I know is the "'EVENT" only allowed for single bits.

'EVENT on vector is not syntheziable. Why not using a PROCESS with a sensitivity list ?

Your assign values to MSD_7SEG and LSD_7SEG in three different processes. That causes the multiple driver error. You have to combine the processes to one. Additinonal you have two wait statements in one process, which is also not allowed.

Kind regards

GPK

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At pletz, ive already changed that "event" part, thank you. I tried combining the processes. it compiles but doesnt work as it should. this code works superbly on the UP2 board. Can you show me exactly to combine the processes?

Regards

Dante