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| /rk3399_rockchip-uboot/arch/arm/include/asm/arch-mx6/ |
| H A D | mx6-ddr.h | 78c5a180871d4337d4cfd41d6739a04b271b2e4d Fri Apr 03 23:52:52 UTC 2015 Tim Harvey <tharvey@gateworks.com> arm: mx6: ddr: add pd_fast_exit flag to system information
DDR3 has a special Precharge power-down mode: fast-exit vs slow-exit.
In slow-exit mode the DLL is off but in some quiescent state that makes it easy
to turn on again in tXPDLL cycles (about 10tCK) vs the full tDLLK (512tCK).
In fast-exist mode the DLL is maintained such that it is ready again in about
3tCK.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
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