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author | Stefan Agner <stefan.agner@toradex.com> | 2017-08-29 18:57:57 -0700 |
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committer | Max Krummenacher <max.krummenacher@toradex.com> | 2017-10-02 19:26:39 +0200 |
commit | 4370811cbaf9a3dd1c34fe51532d1454328e6de8 (patch) | |
tree | 476aa0ef69c403ea319c0e7523e23e2b63b9dc89 /common/usb_storage.c | |
parent | e3da668a51571d06a7cc50842be7742ce7d57274 (diff) |
colibri_imx7: improve DDR3 timing
This makes sure that all Colibri iMX7 modules work with the
same timing. The changes are:
- Disable ODT on read (JEDEC standard JESD79-3F says in chapter
5.2.3 ODT during Reads: "As the DDR3 SDRAM can not terminate
and drive at the same time, RTT must be disabled at least half
a clock cycle..." and also MX7D SABRESD is disabling it)
This alone fixed memory issues for two Colibri iMX7 1GB modules
which showed issues before
- Make sure tRFC(min) is at least 260ns
- Make sure tRC is >50.625ns
- tRP needs to be >13.125ns, we can lower from 18.75ns to 15ns
- tFAW is not relevant, leave at reset
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Diffstat (limited to 'common/usb_storage.c')
0 files changed, 0 insertions, 0 deletions