Cyclone V Device Handbook: Volume 2: Transceivers

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

5.1.2.2. Rate Match FIFO Behaviors in Custom Double-Width Mode

The different operations available in custom double-width mode for the rate match FIFO are symbol insertion, symbol deletion, full condition, and empty condition.
Table 60.  Rate Match FIFO Behaviors in Custom Double-Width Mode (20-bit PMA–PCS Interface Width)
Operation Behavior
Symbol Insertion Inserts as many pairs (10-bit skip patterns at the LSByte and MSByte of the 20-bit word at the same clock cycle) of skip patterns as needed.
Symbol Deletion Deletes as many pairs (10-bit skip patterns at the LSByte and MSByte of the 20-bit word at the same clock cycle) of skip patterns as needed.
Full Condition Deletes the pair (20-bit word) of data bytes that causes the FIFO to go full.
Empty Condition Inserts a pair of /K30.7/ ({9'h1FE, 9'h1FE}) after the data byte that causes the FIFO to go empty.