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i.MX7S + LPDDR2 : Wr/Rd Problem in DDR Test Tool

Question asked by David George on Nov 10, 2016
Latest reply on Nov 17, 2016 by Yuri Muhin

I have a custom board with i.MX7S and Micron LPDDR2 (1GB in 2 Ranks, 32 bit).

I have created the DDR register values with NXP's 'i.MX7D DDR Controller Configuration Spreadsheet '


When I run the DDR Stress Test Tools;

1) The Calibration Passes @ 460 MHz - I get delay values with a good margin

2) The Stress Test runs @ 460 MHz overnight without error.


However when I try a Memory Write & Read it only writes successfully ONCE. After that I can't write another value, it always reads the same value, if I do a Calibration cycle then I can Write just one value again.


So obviously something is setup wrong or not configured correctly.


Can anyone help or has experience for using LPDDR2 with i.MX7?