Cyclone® V Hard Processor System Technical Reference Manual

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

26.4.4. Message Object Reconfiguration for Frame Transmission

To configure a message object to transmit data frames, set the Dir field to 1, and either set UMask to 0 or set RmtEn to 1.

Before changing any of the following configuration and control bits, you must set MsgVal to 0:

  • Dir
  • RxIE
  • TxIE
  • RmtEn
  • EoB
  • UMask
  • Msk[28:0]
  • MXtd
  • MDir

The following fields of a message object can be changed without clearing MsgVal:

  • ID[28:0]
  • Xtd
  • DLC[3:0]
  • Data0[7:0] to Data7[7:0]
  • TxRqst
  • NewDat
  • MsgLst
  • IntPnd