4.11.2. Alignment synchronization

A-sync packets provide alignment synchronization. The PTM generates an A-sync packet when it is initialized, and then generates additional A-sync packets periodically. A trace decompressor uses the A-sync packets to achieve:

The PFT protocol guarantees that the first byte (8 bits) after the last bit of an A-sync packet is the first byte of a new packet. Therefore, detecting an A-sync packet achieves byte alignment and packet boundary synchronization.

For details of the A-sync packet see A-sync, alignment synchronization packet.

Copyright © 1999-2002, 2004-2008, 2011 ARM. All rights reserved.ARM IHI 0035B
Non-ConfidentialID060811