I'm trying to come up with a way to daisy chain the TUSB2077A. I've read this post (http://e2e.ti.com/support/interface/digital_interface/f/130/t/157867.aspx) and understand the timing issues involved with each one: each one after the first one will have to wait for the previous to enumerate. So essentially each power-on-reset must be slightly slower than the previous. Great, that's fairly easy to do as fixed values. But, is there a way to not have them at fixed values, but rather rely on when the previous one is done?
What I'm trying to create is a single 6+1-port board. Port 1 will be reversed for daisychaining. When I want to add a second board, it gets connected to the first one's Port 1. If I want to add a 3rd board, it gets connected to Port 1 on the second board, etc., etc. (Each board will have their own power rail, it won't all feed off of the first board.) So I need a way to have the power-on-reset for each one slower than the previous one.
Is there a way to do that that doesn't involve a static RC circuit? Otherwise I'm looking at something like a small dip-switch block with each switch having a slightly larger resistor that the user can then set ...
Suggestions? Other caveats I need to watch out for?
