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Altera_Forum
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10 years ago

Carry Chain used as delay line - Problems with supllying LUT-s with ones and zeros

I am trying to implement carry chain with Cyclone IV FPGA. I will use carry chain as delay line so here is quick explanation of my program: When input signal "START" goes high, signal starts to pro...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

Currently I am having problems with manual placement of resources. I know how to create delay line. Problem starts with manual placement of resources; for example when I try to place START block at the beginning of the delay line, line gets deformation (random placement of elements for example or slight deformations). I really don't understand why manual placement of element affects delay line. Here is example of delay line without deformation:

https://www.alteraforum.com/forum/attachment.php?attachmentid=12114 https://www.alteraforum.com/forum/attachment.php?attachmentid=12114

Here is example of deformed delay line:

https://www.alteraforum.com/forum/attachment.php?attachmentid=12115