W949D6DB Datasheet, PDF (12/60 Pages) Winbond – Standard Self Refresh Mode

7.1.1 Initialization Flow Diagram
W949D6DB / W949D2DB
1 VDD and VDDQ Ramp: CKE must be held high
2 Apply stable clocks
3 Wait at least 200µs with NOP or DESELECT on command bus
4 PRECHARGE ALL
5 Assert NOP or DESELCT for tRP time
Issue two AUTO REFRESH commands each followed by
6 _{NOP or DESELECT commands for tRFC time}
7 Configure Mode Register
8 Assert NOP or DESELECT for tMRD time
9 Configure Extended Mode Register
10 Assert NOP or DESELECT for tMRD time
11 LPDDR SDRAM is ready for any valid command
- 12 -
Publication Release Date: Oct. 08, 2014
Revision: A01-003