Intel® Quartus® Prime Pro Edition User Guide: Platform Designer

ID 683609
Date 9/26/2022
Public

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Document Table of Contents

7.11.2. Avalon® Streaming FIFO IP Operating Modes

  • Default mode—the IP accepts incoming data on the in interface ( Avalon® streaming data sink) and forwards it to the out interface ( Avalon® streaming data source). The IP asserts the valid signal on the Avalon® streaming source interface to indicate that data is available at the interface.
  • Store and forward mode—this mode applies only to the single-clock FIFO IP. The IP asserts the valid signal on the out interface only when a full packet of data is available at the interface. In this mode, you can also enable the drop-on-error feature by setting the drop_on_error register to 1. When this feature is enabled, the IP drops all packets received with the in_error signal asserted.
  • Cut-through mode—this mode applies only to the single-clock FIFO IP. The IP asserts the valid signal on the out interface to indicate that data is available for consumption when the number of entries specified in the cut_through_threshold register are available in the FIFO buffer.
Note: To turn on Cut-through mode, the Use store and forward parameter must be set to 0. Turning on Use store and forward mode prompts the user to turn on Use fill level, and then the CSR appears.