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IMX6DQ DDR3 stress test failure

Question asked by yibo wang on Feb 18, 2018
Latest reply on Feb 19, 2018 by yibo wang

I meet a problem that is ddr3 stress test failure like below

always failure at 64bit 's MSB 32bit write vlaue error

ddr3 test script is " "


DDR Stress Test (2.6.0) 
Build: Aug 1 2017, 17:33:25 
NXP Semiconductors. 

Chip ID 
CHIP ID = i.MX6 Dual/Quad (0x63) 
Internal Revision = TO1.2 

Boot Configuration 
SRC_SBMR1(0x020d8004) = 0x00021040 
SRC_SBMR2(0x020d801c) = 0x12000001 

ARM Clock set to 1GHz 

DDR configuration 
BOOT_CFG3[5-4]: 0x00, Single DDR channel. 
DDR type is DDR3 
Data width: 64, bank num: 8 
Row size: 15, col size: 10 
Chip select CSD0 is used 
Density per chip select: 2048MB 

DDR Stress Test Iteration 1 
Current Temperature: 46 

DDR Freq: 528 MHz 
t0.1: data is addr test 
t0: memcpy10 SSN x64 test 
Address of bank1 failure: 0x2182fec0 
Data initially read was: 0xFFFFFEC4FFFFFFFF 
Data re-read is: 0xFFFFFEC4FFFFFFFF 
But pattern was: 0xFFFFFFFFFFFFFFFF 
Error: failed to run stress test!!! 

0x0 0x4 0x8 0xC 
0x2182FEC0: 0xFFFFFFFF 0xFFFFFEC4 0x00001000 0x0000FECC 
0x2182FED0: 0xFFFFFFFF 0xFFFFFED4 0x00002000 0x0000FEDC 
0x2182FEE0: 0xFFFFFFFF 0xFFFFFEE4 0x00004000 0x0000FEEC 
0x2182FEF0: 0xFFFFFFFF 0xFFFFFEF4 0x00008000 0x0000FEFC 
0x2182FF00: 0xFFFFFFFF 0xFFFFFFFF 0x00010000 0x00000000 
0x2182FF10: 0xFFFFFFFF 0xFFFFFFFF 0x00020000 0x00000000 
0x2182FF20: 0xFFFFFFFF 0xFFFFFFFF 0x00040000 0x00000000 
0x2182FF30: 0xFFFFFFFF 0xFFFFFFFF 0x00080000 0x00000000 
memory read is done 



My design reference the sabre sdb 1GB ddr3 board。

ONLY change the ddr3 part number to fit the 2GB。“MT41K128M16JT-125 ” to “MT41K256M16HA-125IT”

The ddr3‘s signal route was same with the sabre sdb board 。

The sabre sdb use 8 layer layout, but I use 6 layer board layout to cost down and the DDR_VREF voltage use lines not plane。


Is this layout was poor,have any suggestion for me?

Can I fix this “ddr3’s stress test failure” problem by change the MMDC regs value?

or change the poor layout first?

Have any success IMX6DQ design use the 6 layers board before?