1# RK3568Release Note 2 3## rk3568_ddr_{1560...324}MHz_v1.14.bin 4 5| Date | File | Build commit | Severity | 6| ---------- | :----------------------------------- | ------------ | --------- | 7| 2022-08-27 | rk3568_ddr_{1560...324}MHz_v1.14.bin | b1f29a2a6f | important | 8 9### Fixed 10 11| Index | Severity | Update | Issue description | Issue source | 12| ----- | --------- | --------------------------------------------------------- | ------------------------------------------------------------ | ------------ | 13| 1 | important | fix some LPDDR4 stability problem | CXMT CXDB5CCAM-MK instability for 1560MHz at LPDDR4 mode. Fix this issue by set CLK/CA slew rate from 0xf to 0x0 . | none | 14| 2 | moderate | fix Fix set of t_xs_x32, t_xs_abort_x32 and t_xs_fast_x32 | Fix set of t_xs_x32, t_xs_abort_x32 and t_xs_fast_x32.This bug may lead to some low density dram(128M) fail. | none | 15| 3 | important | fix ddr4 528M stability problem | some DRAM DLL can't lock at 528M，DLL should be bypass for 528M | none | 16| | important | fix ddr4 1560M stability problem | some 2 rank DDR4 PCB DQS/DQ slew rate should be set to 0x0 when running at1560MHz. | none | 17 18------ 19