According AMM 34-61-00/001 9. Thrust Management it says under B(3)
that A/T is only engaged when engage logic is true, so on GRD at REV is no logic engaged, like GOAROUND or SPEED or VNAV.
But couln't find a simple logic or input table for it, looks like software (they had already software ?
)
Was thinking before when the Reverser switches in throttle pack are activated, comes a signal for disengaging ,but isn't.
rgds