W641GG2JB Datasheet, PDF (3/109 Pages) Winbond – 1-Gbit GDDR3 Graphics SDRAM

W641GG2JB
1-Gbit GDDR3 Graphics SDRAM
6.7.6 Termination Rtt ................................................................................................................................................48
6.7.7 Impedance Autocalibration of Output Buffer and Active Terminator ...............................................................49
6.7.7.1 Impedance Options.....................................................................................................................................................49
6.7.7.2 Timing of Vendor Code and Revision ID Generation on DQ[7:0] ................................................................................49
6.7.8 Output Driver Impedance.................................................................................................................................50
6.7.9 Data Termination .............................................................................................................................................50
6.7.10 Address command termination ......................................................................................................................50
6.8 Extended Mode Register 2 Set Command (EMRS2) .......................................................................... 50
6.8.1 Extended Mode Register 2 Set Command ......................................................................................................51
6.8.2 Extended Mode Register 2 (EMRS2) .............................................................................................................. 51
6.8.2.1 Extended Mode Register 2 (EMRS2) ..........................................................................................................................52
6.8.2.2 Impedance Offsets......................................................................................................................................................52
6.8.2.3 Merged Mode..............................................................................................................................................................52
6.8.3 OCD Pull Down Offset ..................................................................................................................................... 52
6.8.4 ODT Pull Up Offset .......................................................................................................................................... 52
6.9 Extended Mode Register 3 (EMRS3) ................................................................................................. 53
6.10 Vendor Code and Revision ID .......................................................................................................... 53
6.10.1 Vendor ID Code ............................................................................................................................................. 53
6.11 Bank / Row Activation (ACT)............................................................................................................ 54
6.11.1 Activating a specific row ................................................................................................................................ 54
6.11.2 Bank Activation Timing ..................................................................................................................................55
6.11.3 Bank Activation Timing on different rank in 2-CS mode................................................................................55
6.11.4 Four Window Active tFAW.............................................................................................................................55
6.11.5 Clock, CKE and command / Address Timings ..............................................................................................56
6.12 Bank Activations with REFRESH ..................................................................................................... 56
6.12.1 Bank Activations with REFRESH Command.................................................................................................56
6.13 Writes (WR) ..................................................................................................................................... 57
6.13.1 Write - Basic Information ...............................................................................................................................57
6.13.1.1 Write Command ........................................................................................................................................................58
6.13.1.2 Mapping of WDQS and DM Signals ..........................................................................................................................58
6.13.1.3 Basic Write Burst / DM Timing ..................................................................................................................................59
6.14 Write - Basic Sequence ................................................................................................................... 60
6.15 Write - Consecutive Bursts............................................................................................................... 61
6.15.1Gapless Bursts................................................................................................................................................ 61
6.15.1.1 Gapless Write Bursts ................................................................................................................................................61
6.15.2 Bursts with Gaps ............................................................................................................................................ 62
6.15.2.1 Consecutive Write Bursts with Gaps .........................................................................................................................62
6.15.3 Write with Autoprecharge ..............................................................................................................................63
6.15.4 Write followed by Read ..................................................................................................................................64
6.15.5 Write followed by Read on different ranks in 2-CS mode...............................................................................65
6.15.6 Write followed by DTERDIS...........................................................................................................................66
6.15.7 Write with Autoprecharge followed by Read / Read with Autoprecharge on another bank ...........................67
6.15.8 Write followed by Precharge on same bank...................................................................................................68
Publication Release Date: Apr, 22, 2011
-3-
Revision A01-002