220.127.116.11.1. Deferrable Memory Write (DMWr)
Deferrable Memory Write (DMWr) transactions are a new type of TLP supported by the PCI Specifications. This new feature allows the completer to return an acknowledgement to the requester of the DMWr transaction and provides the completer a mechanism to temporarily refuse the request. For additional details, refer to the Deferrable Memory Write (DMWr) ECN.
- During the credit initialization phase between the IP and the Application logic, the Application logic needs to advertise infinite credits for Non-Posted Data (NPD) transactions to the IP. Note that the Application logic can still throttle the Non-Posted traffic with the credits for the Non-Posted Headers (NPH). Refer to Credit Initialization for more details on the procedure required to advertise infinite credits.
- With infinite credits being advertised between the R-tile Avalon Streaming IP and the Application logic, the minimum size of the Application logic Rx buffer for Non-Posted Data (NPD) transactions needs to be equal to the amount of Non-Posted Header (NPH) advertised credits multiplied by 128 bytes.
Did you find the information on this page useful?