W641GG2JB Datasheet, PDF (2/109 Pages) Winbond – 1-Gbit GDDR3 Graphics SDRAM

W641GG2JB
1-Gbit GDDR3 Graphics SDRAM
6.4.2.6 Scan Shift Timing........................................................................................................................................................31
6.4.2.7 Scan AC Electrical Characteristic ................................................................................................................................32
6.4.3 Scan Initialization.............................................................................................................................................32
6.4.3.1 Scan Initialization for Stand-Alone Mode .....................................................................................................................32
6.4.3.2 Scan Initialization for Stand-Alone mode ....................................................................................................................33
6.4.4 Scan Initialization in regular SGRAM operation ............................................................................................... 33
6.4.4.1 Scan Initialization Sequence within regular SGRAM Mode .........................................................................................34
6.4.5 Scan Exit Sequence ........................................................................................................................................ 35
6.4.5.1 Boundary Scan Exit Sequence ...................................................................................................................................35
6.4.5.2 Scan AC Electrical Parameter .....................................................................................................................................35
6.5 Programmable impedance output drivers and active terminations ...................................................... 36
6.5.1 GDDR3 IO Driver and Termination ..................................................................................................................36
6.5.1.1 Output Deiver simplified schematic .............................................................................................................................37
6.5.1.2 Range of external resistance ZQ .................................................................................................................................37
6.5.1.3 Termination Types and Activation ...............................................................................................................................37
6.5.2 Self Calibration for Driver and Termination ......................................................................................................38
6.5.2.1 Termination update Keep Out time after Autorefresh command .................................................................................38
6.5.2.2 Number of Legs used for Terminator and Driver Self Calibration ................................................................................39
6.5.2.3 Self Calibration of PMOS and NMOS Legs.................................................................................................................39
6.5.3 Dynamic Switching of DQ terminations............................................................................................................40
6.5.3.1 ODT Disable Timing during a READ command ..........................................................................................................40
6.5.4 Output impedance and Termination DC Electrical Characteristics ..................................................................41
6.5.4.1 DC Electrical Characteristic .........................................................................................................................................41
6.6 Mode Register Set Command (MRS) ................................................................................................. 42
6.6.1 Mode Register Set Command .........................................................................................................................42
6.6.2 Mode Registers................................................................................................................................................42
6.6.2.1 Mode Register (MRS) .................................................................................................................................................42
6.6.2.2 Mode Register (MRS) .................................................................................................................................................43
6.6.2.3 Mode Register Set Timing...........................................................................................................................................43
6.6.3 Burst Length and Burst Type...........................................................................................................................44
6.6.3.1 Burst Length................................................................................................................................................................44
6.6.3.2 Burst type....................................................................................................................................................................44
6.6.4 CAS Latency....................................................................................................................................................44
6.6.5 Write Latency...................................................................................................................................................44
6.6.6 DLL Reset ........................................................................................................................................................ 45
6.6.7 Test mode........................................................................................................................................................45
6.7 Extended Mode Register Set Command (EMRS1) ............................................................................. 45
6.7.1 Extended Mode Register Set Command .........................................................................................................46
6.7.2 Extended Mode Register 1 (EMRS1) .............................................................................................................. 46
6.7.2.1 Extended Mode Register 1 (EMRS1) ..........................................................................................................................47
6.7.2.2 Extended Mode Register Set Timing ..........................................................................................................................48
6.7.3 Chip Select Mode ............................................................................................................................................ 48
6.7.4 DLL .................................................................................................................................................................. 48
6.7.5 Write Recovery................................................................................................................................................48
Publication Release Date: Apr, 22, 2011
-2-
Revision A01-002