Hi,
We made a board according to dm368-ipnc solution, but found ddr don't work. The chip is K4T1G164QE-HEC7. When downloading program to it, it said data verification failed.
We ran the ddr test program in the EVM, all data and address lines failed.
The power supply to ddr is ok.
We try to lower the DDR clock in order to measure it.
The original DDR clk set in GEL is 270MHz, we change the PLL2_PLLM register to set the clk below 100MHz, but no clock signal could be measured, the voltage of CK pair is about 500mv.
// origin code in gel file
*PLL2_PLLM = 0x2D; // M=45 ; VCO will 24*2M/N+1 = 270Mhz
*PLL2_PREDIV = 0x8000|0x7; // N = 7
*PLL2_POSTDIV = 0x8000; // div by 1
//changed code
*PLL2_PLLM = 0x7;
I have no idea where's the problem. Look forward to your suggestions. Thanks!
Lily
