DDR stress test error

m_c — Fri, 16 Jun 2017 07:45:06 GMT

DDR3 layout same as SabreSD board.
Four (U1~U4) 16-bits DDR3 with one chip select.
U1 is 0~15 bit
U2 is 16~31 bit
U3 is 32~47 bit
U4 is 48~63 bit

DDR Freq: 396 MHz
t0.1: data is addr test
Address of failure: 0x4f9e5f84
Data was: 0x00005f84
But pattern should match address
Error: failed to run stress test!!!

May we know which DDR3 chip has issue?

Re: DDR stress test error

Yuri — Fri, 16 Jun 2017 08:04:57 GMT

Hello,

Since "pattern should match address " - high two bytes do not match in Your case.

Look at U2 (16~31 bit) and U4 (48~63 bit).

Also, please try to check the design, using section 1.1 (Schematic and Layout Design Rules) of the DDR3
Porting Guide

Freescale i.MX6 DRAM Port Application Guide-DDR3

In particular, there is an Excel page named “MX6 DRAM Bus Length Check” in “HW Design Checking List
for i.Mx6”. Designer can use it for layout self-checking. Input trace length of the design into cells in pink circle then, the bottom cell in same column may change to red color if layout breaks the rule.

Recent design checklist may be found at

HW_Design_Checking_List_for_i.MX6DQP6DQ6SDL

Have a great day,
Yuri

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DDR stress test error

Re: DDR stress test error