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AM2431: EtherCAT程序,在AM2434上面正常运行,为啥在AM2431就卡死呢

Part Number: AM2431
Other Parts Discussed in Thread: AM2434,

项目前期使用AM2434,设计的EtherCAT程序,可以正常运行,现在换作AM2431,就卡在下面位置,请专家帮忙看看,是啥原因?

#ifdef SUPPORT_CMDACK_POLL_MODE
volatile uint16_t ack;

do
{
   ack = bsp_pruss_cmd_intfc_read_word(&pHost2PruIntfc->cmdlow_ack);
}while(ack);
#else

读回来的ack值,始终是1.