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W9725G6JB

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W9725G6JB 4M  4 BANKS  16 BIT DDR2 SDRAM Table of Contents1. GENERAL DESCRIPTION ................................................................................................................... 4 2. FEATURES ........................................................................................................................................... 4 3. KEY PARAMETERS ............................................................................................................................. 5 4. BALL CONFIGURATION ...................................................................................................................... 6 5. BALL DESCRIPTION ............................................................................................................................ 7 6. BLOCK DIAGRAM ................................................................................................................................ 8 7. FUNCTIONAL DESCRIPTION .............................................................................................................. 9 7.1 7.2 Power-up and Initialization Sequence ................................................................................................... 9 Mode Register and Extended Mode Registers Operation ................................................................... 10 7.2.1 Mode Register Set Command (MRS)............................................................................... 10 7.2.2 Extend Mode Register Set Commands (EMRS) .............................................................. 11 7.2.2.1 Extend Mode Register Set Command (1), EMR (1)................................................ 11 7.2.2.2 DLL Enable/Disable ................................................................................................ 12 7.2.2.3 Extend Mode Register Set Command (2), EMR (2) ................................................ 13 7.2.2.4 Extend Mode Register Set Command (3), EMR (3) ................................................ 14 7.2.3 Off-Chip Driver (OCD) Impedance Adjustment ................................................................ 15 7.2.3.1 Extended Mode Register for OCD Impedance Adjustment .................................... 16 7.2.3.2 OCD Impedance Adjust .......................................................................................... 16 7.2.3.3 Drive Mode ............................................................................................................. 17 7.2.4 On-Die Termination (ODT) ............................................................................................... 18 7.2.5 ODT related timings ......................................................................................................... 18 7.2.5.1 7.3 MRS command to ODT update delay ..................................................................... 18 Command Function ............................................................................................................................. 20 7.3.1 Read Command ............................................................................................................... 20 7.3.3 Write Command ............................................................................................................... 21 7.3.4 Burst Read with Auto-precharge Command..................................................................... 21 7.3.5 Burst Write with Auto-precharge Command ..................................................................... 21 7.3.6 Precharge All Command .................................................................................................. 21 7.3.7 Self Refresh Entry Command .......................................................................................... 21 7.3.8 Self Refresh Exit Command ............................................................................................. 22 7.3.9 Refresh Command ........................................................................................................... 22 7.3.10 No-Operation Command .................................................................................................. 23 7.3.11 7.4 Bank Activate Command.................................................................................................. 20 7.3.2 Device Deselect Command .............................................................................................. 23 Read and Write access modes ........................................................................................................... 23 7.4.1 7.4.1.1 Posted CAS .................................................................................................................... 23 Examples of posted CAS operation ..................................................................... 23 -1- Publication Release Date: Nov. 29, 2011 Revision A02

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