6678evm 运行K1_STK_v1 中 memory_test

user6005307

TI的工程师你们好！在 memory_test中的KeyStone_memory_bus_test（）函数中调用Memory_Data_Bus_Test（）函数其下的伪代码如下所示：

volatile unsigned long long *ulpAddressPointer;

uiBusWidth_64bit= (uiBusWidth+63)/64;

for(j=0; j<uiBusWidth_64bit; j++)
{
//write a pattern
*ulpAddressPointer = ulDataPattern[i];
ulpAddressPointer[uiBusWidth_64bit]= ~ulDataPattern[i]; //avoid floating bus
ulReadBack= *ulpAddressPointer;
if (ulReadBack != ulDataPattern[i])
{
printf(" Data pattern Test fails at 0x%8x, Write 0x%016llx, Readback 0x%016llx\n", (unsigned int)ulpAddressPointer, (ulDataPattern[i]), ulReadBack);
Memory_error_double_check((volatile unsigned long long *)ulpAddressPointer);
uiFailCount++;
}

其中uiBusWidth_64bit = 256*4，*ulpAddressPointer指向的地址是L2或者SMC。uiBusWidth_64bit是根据数据总线的宽度计算的吗？，*ulpAddressPointer = ulDataPattern[i];和 ulpAddressPointer[uiBusWidth_64bit]= ~ulDataPattern[i];中读写测试为什么要相隔uiBusWidth_64bit的地址，这么做是为了测试什么？

6 年多前

0 Nancy Wang 6 年多前

TI__Guru** 110395 points

请参考看一下K1_STK_v1.1\K1_STK_v1.1\docs\KeyStone_1_Memory_STK_User's_Guide部分的说明。
Floating bus may “cheat” the test program. To avoid floating bus, a dummy write to another address with inverted value is inserted into original write and read operations.

For example：

write A to address X;
write inversion of A to address Y;
read value from address X;

In this way, the floating bus is avoided.

0 Shine 6 年多前

TI__Guru**** 357097 points

注释里写了avoid floating bus，具体请参考KeyStone_1_Memory_STK_User's_Guide的2.4 Floating bus problem

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6678evm 运行K1_STK_v1 中 memory_test