Li-Ta Lo firstname.lastname@example.org writes:
You explained substractive decoding to me long time ago but I really forgot what it is. Could you tell me again ? Hoe do you determine if some resource of some device is substractive ? Form the data sheet ?
A subtractive bridge resource is a bridge resource that picks up the unclaimed transactions and forwards them on. In networking the equivalent concept the default route. A subtractive resource is what picks up all of the traffic on a bus that does not have a specific route to somewhere else.