The sync word is a 64-bit code word derived from a 24 bit address (LAP); forthe CAC the master’s LAP is used; for the GIAC and the DIAC, reserved,dedicated LAPs are used; for the DAC, the slave LAP is used. The constructionguarantees large Hamming distance between sync words based on differentLAPs. In addition, the good auto correlation properties of the sync wordimprove timing acquisition.