仲裁寄存器default值：

The default values of CPUARB, IDMAARB, SDMAARB, and UCARB are sufficient for most applications. These registers define priorities that are internal to the C66x CorePac.The MDMAARBU register defines priority for MDMA transactions outside of the C66x CorePac.You may need to change its priority by programming the MDMAARBU register ,depending on the system design.In most cases, MDMARBU should be programmed to a higher priority (lower value)(在APP中，MDMARBU的优先级往往需要修改为higher，在每个CPU上都要修改，才能在每个CPU上起作用). The ECFGARBE register defines priority for configuration bus transactions from EMC.

例如在CPU 1，2，3，4的配置文件中，都要有下面类似的配置，才能在每个CPU上起作用：

    /*Configure Master DMA Arbitration Control Register(MDMAARBU)  */
     *(u32*)(0x01841010) = 0x01020000;