alt_mem_phy DDR2 controller INIT_done going LOW.

Hi all.

Need help. I have a problem with DDR2.

I'm using DDR2 HPC1 memctrl with alt_mem_phy IP and EPCGX110DF31I7. Addressing 2 parallel MT47H128M16HG-3IT:A (FBGA-84) "MICRON (totaling to 32-bit data bus width, 1 nCS).

I using Quartus 11.1 sp2.

pll_ref_clk=40 MHz.

phy_clk = 140 MHz.

controller data rate= Half.

Enable user Auto-refresh control =on.

Native interface.

Problem with replication of nCS, CKE, ODT – solved.

I done tcl file and add ddr sdc file. Onchip series termination on (50 Ohm without calibration).

Devices always starting and working normal, but in a one moment local_init_done going LOW and after not going HIGH never. Only after global reset alt_mem_phy DDR2 controller release local_init_done ('1').

Device can working all day, but can work only few minutes. This behavior repeat on all devices.

Why local_init_done may be falling? Files of DDR2 controller encrypted and I not view condition of this case in HDL file.

Thanks for any help!

Alex