• 状态
  • 已锁定 已锁定
  • 回复 2 回复
  • 订户 14 订户
  • 视图 741 视图
  • 用户 0 会员在此处
选项
选项
相关

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

tms320c6678 ,CPPI,linkingram问题

sun tom
Prodigy 250 points
Other Parts Discussed in Thread: TMS320C6678

tms320c6678 ,CPPI,linkingram问题

代码的相关配置为如下：

/*-----------------QMSS queue configuration------------------*/
#if (TOTAL_LINKING_ENTRY_SIZE>16*1024)
KeyStone_QMSS_Linking_RAM_init(linkingRAM1, LINKING_RAM1_SIZE);
#else
KeyStone_QMSS_Linking_RAM_init(NULL, 0);
#endif

我想问这个配置内部外部的linkingram的作用是什么？？起什么样的功能？？

  • 0
    TI__Mastermind 27075 points

    link ram 用来存放descriptor的index值及链接关系。

    如果你的系统里descriptor个数不超过16K个，那么内部linkram即可满足要求，如果超过这个数目，则需在L2，SL2或者DDR中开辟外部LINKRAM。

    但是要注意在使用外部LINKRAM时要遵循下述原则

    The Queue Manager’s external linking RAM must be placed in a different memory endpoint from the packet descriptors or data buffers. As an example, if the external linking RAM is placed in MSMC SRAM, then the packet descriptors and data buffers must be placed in L2RAM and/or DDR3. Note that the packet descriptors and data buffers do not have to be placed in the same memory endpoints.

  • 0 回复 Allen35065
    Prodigy 250 points

    能具体解释一下：”link ram 用来存放descriptor的index值及链接关系“是什么意思？？index值及链接关系？？