I'm stuck on a PCB design issue.
I'm designing a new PCB (Daughter board) that will plug (via DB15-F to DB15-M) onto another PCB (existing Mother board) and the design intent is to take (from the Mother board) the existing differential Step/Dir signals and reconstruct them into single-ended TTL Step/Dir signals on the new Daughter board. After reading the datasheet (several times) for the MAX3095 (pg 11 Fail-Safe Implementation) my interpolation is that with the existing (which I cannot change) PCB using the MAX13443 driver circuit (with the diff lines biased to 2.5V) then the MAX3095 receiver output (Y1/Y2) will/may be undefined during boot-up. I was not planning on terminating the MAX 3095 receiver's diff input's because the total conductor lengths involved are like 1 inch board-to-board and low baud 250kbps. I was hoping to let the built-in Fail-Safe utility (on the MAX3095) keep the receiver's outputs in a defined state during uProcessor boot-up, high Z state or open. But now I am 2nd guessing myself.
Because the mother board diff signals are bias equally (when not driven) should I add the external discrete termination/Fail-Safe circuit (instead of relying on the built-in FS utility) on the MAX3095?
If the attached image is un-readable I will do a crash course (schematic tool) on the EESE site.
edit: I just noticed an artifact (or rushing my efforts) from my copy/paste and the diff pairs going to the MAX3095 are NOT RS422 but just TTL/CMOS born diff signals.