I'm looking for some help/insight into a decision I am making about whether to change a circuit I have built.
My slave device requires a pull-up on its SDO (MISO) pin which is open collector. When originally drawn, this pull-up was placed close to the slave device, before the signal passed through an isolation device and was then sent over a link harness to the board containing the master device.
Later we moved the isolation barrier to the control board side, and the pull-up got dragged across too, for whatever reason.
So the sequence now goes
SDO pin -> Link harness -> master board with pull-up and isolation device -> gate array MISO pin
and the two boards work together OK.
Given the opportunity now to respin the slave board, what are the arguments for bringing the pull-up back across to live with the slave device, if any?
Apologies for lack of diagram - written on my mobile device. Hope the question is clear, thanks for any input.