DDR3 - What are good delay windows?

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DDR3 - What are good delay windows?

490 Views
tkl
Contributor II

Hi,

after using the DDR Stress Tester to get calibration values for DDR3 according to "Freescale i.MX6 Port Application Guide - DDR3" I am wondering how to judge the resulting delay windows. In the document it says on freescale evaluation boards the window for DQS gating is 1.1 to 1.2 tCK and for read write delay it is 0.3 to 0 4 tCK. So this are good, acceptable values? I have nothing to compare it to. What windows are you getting on your designs?

1 Reply

371 Views
igorpadykov
NXP Employee
NXP Employee

Hi Torben

yes these margin values which gives MX6 DRAM Port Application Guide-DDR3

on p.14,17 are good and recommended

Freescale i.MX6 DRAM Port Application Guide-DDR3 

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Best regards
igor
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