Sync Word - Sync Word - UG570

UltraScale Architecture Configuration User Guide (UG570)

Document ID
UG570
Release Date
2025-03-04
Revision
1.20.1 English

A special Sync word is used to allow configuration logic to align at a 32-bit word boundary. No packet is processed by the FPGA until the Sync word is found. The bus width must be detected successfully for parallel configuration modes before the Sync word can be detected. The following table shows the Sync word in an unswapped bitstream format.

Table 1. Sync Word
31:24 23:16 15:8 7:0
0xAA 0x99 0x55 0x66