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The bit index of the least-significant 1 in SRCRESMASK, or 0x3F when there is no source match. On a match, bit 5 is 0 when the match is on a short address and 1 when it is on an extended address. On a match, bit 6 is 1 when the conditions for automatic pending bit in 0x6163 SRCRESINDEX acknowledgment have been met (see the description of SRCMATCH.AUTOPEND). The bit gives no indication of whether or not the acknowledgment actually is transmitted, and does not take the PENDING_OR register bit and the SACK/SACKPEND/SNACK strobes into account.
