W9725G6KB 4M 4 BANKS 16 BIT DDR2 SDRAM Table of Contents- 1. GENERAL DESCRIPTION ................................................................................................................... 4 2. FEATURES ........................................................................................................................................... 4 3. ORDER INFORMATION ....................................................................................................................... 5 4. KEY PARAMETERS ............................................................................................................................. 5 5. BALL CONFIGURATION ...................................................................................................................... 6 6. BALL DESCRIPTION ............................................................................................................................ 7 7. BLOCK DIAGRAM ................................................................................................................................ 8 8. FUNCTIONAL DESCRIPTION .............................................................................................................. 9 8.1 Power-up and Initialization Sequence ................................................................................................... 9 8.2 Mode Register and Extended Mode Registers Operation ................................................................... 10 8.2.1 Mode Register Set Command (MRS)............................................................................... 10 8.2.2 Extend Mode Register Set Commands (EMRS) .............................................................. 11 8.2.2.1 Extend Mode Register Set Command (1), EMR (1) ................................................ 11 8.2.2.2 DLL Enable/Disable ................................................................................................ 12 8.2.2.3 Extend Mode Register Set Command (2), EMR (2) ................................................ 13 8.2.2.4 Extend Mode Register Set Command (3), EMR (3) ................................................ 14 8.2.3 Off-Chip Driver (OCD) Impedance Adjustment ................................................................ 15 8.2.3.1 Extended Mode Register for OCD Impedance Adjustment .................................... 16 8.2.3.2 OCD Impedance Adjust .......................................................................................... 16 8.2.3.3 Drive Mode ............................................................................................................. 17 8.2.4 On-Die Termination (ODT) ............................................................................................... 18 8.2.5 ODT related timings ......................................................................................................... 18 8.2.5.1 MRS command to ODT update delay ..................................................................... 18 8.3 Command Function ............................................................................................................................. 20 8.3.1 Bank Activate Command .................................................................................................. 20 8.3.2 Read Command ............................................................................................................... 20 8.3.3 Write Command ............................................................................................................... 21 8.3.4 Burst Read with Auto-precharge Command ..................................................................... 21 8.3.5 Burst Write with Auto-precharge Command ..................................................................... 21 8.3.6 Precharge All Command .................................................................................................. 21 8.3.7 Self Refresh Entry Command .......................................................................................... 21 8.3.8 Self Refresh Exit Command ............................................................................................. 22 8.3.9 Refresh Command ........................................................................................................... 22 8.3.10 No-Operation Command .................................................................................................. 23 8.3.11 Device Deselect Command .............................................................................................. 23 8.4 Read and Write access modes ........................................................................................................... 23 8.4.1 Posted CAS ................................................................................................................... 23 CAS 8.4.1.1 Examples of posted operation ..................................................................... 23 8.4.2 Burst mode operation ....................................................................................................... 24 8.4.3 Burst read mode operation ............................................................................................... 25 8.4.4 Burst write mode operation .............................................................................................. 25 8.4.5 Write data mask ............................................................................................................... 26 8.5 Burst Interrupt ..................................................................................................................................... 26 8.6 Precharge operation ............................................................................................................................ 27 Publication Release Date: Jul. 04, 2018 Revision: A05 - 1 - W9725G6KB 8.6.1 Burst read operation followed by precharge ..................................................................... 27 8.6.2 Burst write operation followed by precharge .................................................................... 27 8.7 Auto-precharge operation ................................................................................................................... 27 8.7.1 Burst read with Auto-precharge ....................................................................................... 28 8.7.2 Burst write with Auto-precharge ....................................................................................... 28 8.8 Refresh Operation ............................................................................................................................... 29 8.9 Power Down Mode .............................................................................................................................. 29 8.9.1 Power Down Entry ........................................................................................................... 30 8.9.2 Power Down Exit .............................................................................................................. 30 8.10 Input clock frequency change during precharge power down ............................................................. 30 9. OPERATION MODE ........................................................................................................................... 31 9.1 Command Truth Table ........................................................................................................................ 31 9.2 Clock Enable (CKE) Truth Table for Synchronous Transitions ........................................................... 32 9.3 Data Mask (DM) Truth Table ............................................................................................................... 32 9.4 Function Truth Table ........................................................................................................................... 33 9.5 Simplified Stated Diagram ................................................................................................................... 36 10. ELECTRICAL CHARACTERISTICS ................................................................................................... 37 10.1 Absolute Maximum Ratings ................................................................................................................ 37 10.2 Operating Temperature Condition ....................................................................................................... 37 10.3 Recommended DC Operating Conditions ........................................................................................... 37 10.4 ODT DC Electrical Characteristics ...................................................................................................... 38 10.5 Input DC Logic Level ........................................................................................................................... 38 10.6 Input AC Logic Level ........................................................................................................................... 38 10.7 Capacitance ........................................................................................................................................ 39 10.8 Leakage and Output Buffer Characteristics ........................................................................................ 39 10.9 DC Characteristics .............................................................................................................................. 40 10.10 IDD Measurement Test Parameters .......................................................................................... 42 10.11 AC Characteristics ..................................................................................................................... 43 10.11.1 AC Characteristics and Operating Condition for -18/18I speed grades ............................ 43 10.11.2 AC Characteristics and Operating Condition for -25/25I/-3/-3I speed grades .................. 45 10.12 AC Input Test Conditions ........................................................................................................... 66 10.13 Differential Input/Output AC Logic Levels .................................................................................. 66 10.14 AC Overshoot / Undershoot Specification ................................................................................. 67 10.14.1 AC Overshoot / Undershoot Specification for Address and Control Pins: ........................ 67 10.14.2 AC Overshoot / Undershoot Specification for Clock, Data, Strobe and Mask pins: .......... 67 11. TIMING WAVEFORMS ....................................................................................................................... 68 11.1 Command Input Timing ....................................................................................................................... 68 11.2 ODT Timing for Active/Standby Mode ................................................................................................. 69 11.3 ODT Timing for Power Down Mode .................................................................................................... 69 11.4 ODT Timing mode switch at entering power down mode .................................................................... 70 11.5 ODT Timing mode switch at exiting power down mode ...................................................................... 71 11.6 Data output (read) timing .................................................................................................................... 72 11.7 Burst read operation: RL=5 (AL=2, CL=3, BL=4) ................................................................................ 72 11.8 Data input (write) timing ...................................................................................................................... 73 11.9 Burst write operation: RL=5 (AL=2, CL=3, WL=4, BL=4) .................................................................... 73 11.10 Seamless burst read operation: RL = 5 ( AL = 2, and CL = 3, BL = 4) ...................................... 74 11.11 Seamless burst write operation: RL = 5 ( WL = 4, BL = 4) ......................................................... 74 11.12 Burst read interrupt timing: RL =3 (CL=3, AL=0, BL=8) ............................................................. 75 11.13 Burst write interrupt timing: RL=3 (CL=3, AL=0, WL=2, BL=8) .................................................. 75 11.14 Write operation with Data Mask: WL=3, AL=0, BL=4) ............................................................... 76 Publication Release Date: Jul. 04, 2018 Revision: A05 - 2 -