W948D6FBHX5E-TR Datasheet, PDF (11/60 Pages) Winbond – 256Mb Mobile LPDDR

6.1.1 Initialization Flow Diagram
W948D6FB / W948D2FB
256Mb Mobile LPDDR
1 VDD and VDDQ Ramp: CKE must be held high
2 Apply stable clocks
3 Wait at least 200us 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
- 11 -
Publication Release Date : Oct, 15, 2012
Revision : A01-004