Alchitry Cu and Io Pulldown Resistors

Development Boards FPGA Boards
1

Is the “Alchitry Cu and Io Pulldown Resistors” problem fixed in the DEV-17278 board (see review for DEV-16525).

My attempt at understanding the rev-2 2021-10-26 schematic would suggest things are still wired to VCC and not GND.

2

It should be fixed; there are now 10K pulldowns (R12) on the IO lines (S1-S5), and when a user presses the momentary buttons, those IOs can be momentarily pulled high with 330 pullups (R4)

image (1).png
image (1).png1290×814 228 KB

3

Thanks for pointing out what I clearly missed. For anyone curious:

rev 1->2 added pull-downs R9-R11 for the DIPs; and R12 for push-buttons

ref 2->3 fixed R12 so it really pulled down

thanks again, ordering …