Cyclone V Device Handbook: Volume 2: Transceivers

ID 683586
Date 10/24/2018
Public
Document Table of Contents

1.3.2.5.3. Word Aligner-Based Ordering Mode

In word aligner-based ordering mode, the byte ordering operation is controlled by the word aligner synchronization status signal, rx_syncstatus.

After a rising edge on the rx_syncstatus signal, byte ordering looks for the byte ordering pattern in the byte-deserialized data.

When the first data byte that matches the byte ordering pattern is found, the byte ordering performs the following operations:

  • If the pattern is not in the LSByte position—byte ordering inserts the appropriate number of pad patterns to push the byte ordering pattern to the LSByte position and indicates the byte alignment.
  • If the pattern is in the LSByte position—byte ordering indicates the byte alignment.

Any byte misalignment found thereafter is ignored unless another rising edge on the rx_syncstatus signal, indicating resynchronization, is observed.