Cyclone® V Hard Processor System Technical Reference Manual

ID 683126
Date 8/28/2023
Public
Document Table of Contents

8.3.9. Upsizing Data Width Function

The upsizing function combines narrow transactions into wider transactions to increase the overall system bandwidth. Upsizing only packs data for read or write transactions that are cacheable. If the interconnect splits input-exclusive transactions into more than one output bus transaction, it removes the exclusive information from the multiple transactions it creates.

The upsizing function can expand the data width by the following ratios:

  • 1:2
  • 1:4

If multiple responses from created transactions are combined into one response, then the following order of priority applies:

  • DECERR is the highest priority
  • SLVERR is the next highest priority
  • OKAY is the lowest priority.