Sunday, February 2, 2014

NAND gate speed with pull-up resistors?

In designing rev3, I noticed that we have 10k pull-up resistors on the NAND gate that is used to pass CSYNC to the PR-8210A interface.  I decided to do a quick test to see how responsive this pass-thru was.  I will want to do a more thorough test later.

This is the beginning of vblank:

Here is an extreme close-up of one of the small pulses.  It's hard to tell at the moment whether we should reduce the resistance of that pull-up.

No comments:

Post a Comment