W948D2FBJX5I

W948D6FB / W948D2FB 256Mb Mobile LPDDR TABLE OF CONTENTS 1. GENERAL DESCRIPTION .................................................................................................. 4 2. FEATURES .......................................................................................................................... 4 3. PIN CONFIGURATION ........................................................................................................ 5 3.1 Ball Assignment: LPDDR x16 ..................................................................................................... 5 3.2 Ball Assignment: LPDDR x32 ..................................................................................................... 5 4. PIN DESCRIPTION ............................................................................................................. 6 4.1 Signal Descriptions ..................................................................................................................... 6 4.2 Addressing Table ........................................................................................................................ 7 5. BLOCK DIAGRAM .............................................................................................................. 8 5.1 Block Diagram ............................................................................................................................ 8 5.2 Simplified State Diagram ............................................................................................................ 9 6. FUNCTION DESCRIPTION ............................................................................................... 10 6.1 Initialization ............................................................................................................................... 10 6.1.1 Initialization Flow Diagram ............................................................................................................. 11 6.1.2 Initialization Waveform Sequence ................................................................................................. 12 6.2 Register Definition .................................................................................................................... 12 6.2.1 Mode Register Set Operation ........................................................................................................ 12 6.2.2 Mode Register Definition ............................................................................................................... 13 6.2.3. Burst Length ................................................................................................................................. 13 6.3 Burst Definition ......................................................................................................................... 14 6.4 Burst Type ................................................................................................................................ 15 6.5 Read Latency ............................................................................................................................ 15 6.6 Extended Mode Register Description ....................................................................................... 15 6.6.1 Extended Mode Register Definition ............................................................................................... 16 6.7 Status Register Read ................................................................................................................ 16 6.7.1 SRR Register (A n:0 = 0) .............................................................................................................. 17 6.7.2 Status Register Read Timing Diagram .......................................................................................... 18 6.8 Partial Array Self Refresh ......................................................................................................... 19 6.9 Automatic Temperature Compensated Self Refresh ................................................................ 19 6.10 Output Drive Strength ............................................................................................................. 19 6.11 Commands ............................................................................................................................. 19 6.11.1 Basic Timing Parameters for Commands .................................................................................... 19 6.11.2 Truth Table - Commands ............................................................................................................. 20 6.11.3 Truth Table - DM Operations ....................................................................................................... 21 6.11.4 Truth Table - CKE ........................................................................................................................ 21 6.11.5 Truth Table - Current State BANKn - Command to BANKn ........................................................ 22 6.11.6 Truth Table - Current State BANKn, Command to BANKn ......................................................... 23 7. OPERATION ...................................................................................................................... 24 7.1. Deselect ................................................................................................................................... 24 7.2. No Operation ........................................................................................................................... 24 7.2.1 NOP Command ............................................................................................................................. 25 7.3 Mode Register Set .................................................................................................................... 25 Publication Release Date : Oct, 15, 2012 - 1 - Revision : A01-004 W948D6FB / W948D2FB 256Mb Mobile LPDDR 7.3.1 Mode Register Set Command ....................................................................................................... 25 7.3.2 Mode Register Set Command Timing ........................................................................................... 26 7.4. Active ....................................................................................................................................... 26 7.4.1 Active Command ........................................................................................................................... 26 7.4.2 Bank Activation Command Cycle .................................................................................................. 27 7.5. Read ........................................................................................................................................ 27 7.5.1 Read Command ............................................................................................................................. 28 7.5.2 Basic Read Timing Parameters ..................................................................................................... 28 7.5.3 Read Burst Showing CAS Latency ................................................................................................ 29 7.5.4 Read to Read ................................................................................................................................. 29 7.5.5 Consecutive Read Bursts .............................................................................................................. 30 7.5.6 Non-Consecutive Read Bursts ...................................................................................................... 30 7.5.7 Random Read Bursts .................................................................................................................... 31 7.5.8 Read Burst Terminate.................................................................................................................... 31 7.5.9 Read to Write ................................................................................................................................. 32 7.5.10 Read to Pre-charge ..................................................................................................................... 32 7.6 Write ......................................................................................................................................... 33 7.6.1 Write Command ............................................................................................................................. 34 7.6.2 Basic Write Timing Parameters ..................................................................................................... 34 7.6.3 Write Burst (min. and max. tDQSS) ............................................................................................... 35 7.6.4 Write to Write ................................................................................................................................. 35 7.6.5 Concatenated Write Bursts ............................................................................................................ 36 7.6.6 Non-Consecutive Write Bursts ...................................................................................................... 36 7.6.7 Random Write Cycles .................................................................................................................... 37 7.6.8 Write to Read ................................................................................................................................. 37 7.6.9 Non-Interrupting Write to Read ...................................................................................................... 37 7.6.10 Interrupting Write to Read ........................................................................................................... 38 7.6.11 Write to Precharge ....................................................................................................................... 38 7.6.12 Non-Interrupting Write to Precharge ............................................................................................ 38 7.6.13 Interrupting Write to Precharge ................................................................................................... 39 7.7 Precharge ................................................................................................................................. 39 7.7.1 Precharge Command ..................................................................................................................... 40 7.8 Auto Precharge ......................................................................................................................... 40 7.9 Refresh Requirements .............................................................................................................. 40 7.10 Auto Refresh ........................................................................................................................... 40 7.10.1 Auto Refresh Command .............................................................................................................. 41 7.11 Self Referesh .......................................................................................................................... 41 7.11.1 Self Refresh Command ............................................................................................................... 42 7.11.2 Auto Refresh Cycles Back-to-Back ............................................................................................. 42 7.11.3 Self Refresh Entry and Exit ......................................................................................................... 43 7.12 Power Down ........................................................................................................................... 43 7.12.1 Power-Down Entry and Exit ......................................................................................................... 43 7.13 Deep Power Down .................................................................................................................. 44 7.13.1 Deep Power-Down Entry and Exit ............................................................................................... 44 7.14 Clock Stop .............................................................................................................................. 45 Publication Release Date : Oct, 15, 2012 - 2 - Revision : A01-004