W632GG8KB Datasheet, PDF (2/159 Pages) Winbond – 32M X 8 BANKS X 8 BIT DDR3 SDRAM

W632GG8KB
8.9 Write Leveling .....................................................................................................................................30
8.9.1
DRAM setting for write leveling & DRAM termination function in that mode ....................31
8.9.2
Write Leveling Procedure.................................................................................................31
8.9.3
Write Leveling Mode Exit .................................................................................................33
8.10 Multi Purpose Register........................................................................................................................34
8.10.1
MPR Functional Description.............................................................................................35
8.10.2
MPR Register Address Definition.....................................................................................36
8.10.3
Relevant Timing Parameters............................................................................................36
8.10.4
Protocol Example .............................................................................................................36
8.11 ACTIVE Command..............................................................................................................................42
8.12 PRECHARGE Command ....................................................................................................................42
8.13 READ Operation .................................................................................................................................43
8.13.1
READ Burst Operation .....................................................................................................43
8.13.2
READ Timing Definitions..................................................................................................44
8.13.2.1
READ Timing; Clock to Data Strobe relationship....................................................45
8.13.2.2
READ Timing; Data Strobe to Data relationship .....................................................46
8.13.2.3
tLZ(DQS), tLZ(DQ), tHZ(DQS), tHZ(DQ) Calculation .............................................47
8.13.2.4
tRPRE Calculation..................................................................................................48
8.13.2.5
tRPST Calculation ..................................................................................................48
8.13.2.6
Burst Read Operation followed by a Precharge......................................................54
8.14 WRITE Operation................................................................................................................................56
8.14.1
DDR3 Burst Operation .....................................................................................................56
8.14.2
WRITE Timing Violations .................................................................................................56
8.14.2.1
Motivation ...............................................................................................................56
8.14.2.2
Data Setup and Hold Violations..............................................................................56
8.14.2.3
Strobe to Strobe and Strobe to Clock Violations.....................................................56
8.14.2.4
Write Timing Parameters ........................................................................................56
8.14.3
Write Data Mask...............................................................................................................57
8.14.4
tWPRE Calculation...........................................................................................................58
8.14.5
tWPST Calculation ...........................................................................................................58
8.15 Refresh Command ..............................................................................................................................65
8.16 Self-Refresh Operation .......................................................................................................................67
8.17 Power-Down Modes............................................................................................................................69
8.17.1
Power-Down Entry and Exit .............................................................................................69
8.17.2
Power-Down clarifications - Case 1 .................................................................................75
8.17.3
Power-Down clarifications - Case 2 .................................................................................75
8.17.4
Power-Down clarifications - Case 3 .................................................................................76
8.18 ZQ Calibration Commands..................................................................................................................77
8.18.1
ZQ Calibration Description ...............................................................................................77
8.18.2
ZQ Calibration Timing ......................................................................................................78
8.18.3
ZQ External Resistor Value, Tolerance, and Capacitive loading......................................78
8.19 On-Die Termination (ODT) ..................................................................................................................79
8.19.1
ODT Mode Register and ODT Truth Table ......................................................................79
8.19.2
Synchronous ODT Mode..................................................................................................80
8.19.2.1
ODT Latency and Posted ODT...............................................................................80
8.19.2.2
Timing Parameters .................................................................................................80
8.19.2.3
ODT during Reads..................................................................................................82
8.19.3
Dynamic ODT ..................................................................................................................83
8.19.3.1
Functional Description: ...........................................................................................83
Publication Release Date: Jul. 28, 2014
Revision: A04
-2-