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JEDEC Standard No. 21C
Page 4.20.28-1
Release 25A Revision 1.10
04.20.28 - 288-Pin, 1.2 V (VDD), PC4-1600/PC4-1866/PC4-2133/PC4-2400/
PC4-2666/PC4-2933/PC4-3200 DDR4 SDRAM Registered DIMM
Design Specification
DDR4 SDRAM Registered DIMM Design Specification
Revision 1.10
December 2015
Revision 1.10 Release 25A
JEDEC Standard No. 21C
Page 4.20.28-2
Table of Contents
1 Product Description ................................................................................................. 5
2 Environmental Requirements .................................................................................. 6
3 Connector Pinout and Signal Description................................................................ 7
4 Power Details ........................................................................................................ 12
4.1 DIMM Voltage Requirements..................................................................................................12
4.2 VDDSPD .................................................................................................................. 12
4.3 Recommended Power Sequence ............................................................................. 12
4.4 Feed Through Voltage (VFT) .................................................................................... 14
4.5 12 V Power................................................................................................................ 14
5 Component Details................................................................................................ 15
5.1 Component Types and Placement............................................................................ 18
5.2 Decoupling Guidelines .............................................................................................. 18
6 DIMM Design Details............................................................................................. 19
6.1 Signal Groups ........................................................................................................... 19
6.2 General Net Structure Routing Rules........................................................................ 19
6.2.1 Clock, Control, and Address/Command Groups ........................................................... 20
6.2.2 PreRegister ADD/CMD and CTRL ................................................................................21
6.2.3 PreRegister CK .............................................................................................................21
6.2.4 PostRegister ADD/CMD ................................................................................................22
6.2.5 PostRegister CTRL Group ............................................................................................ 22
6.2.6 DQ Group ......................................................................................................................23
6.3 Plane Referencing..................................................................................................... 24
6.4 Address Mirroring...................................................................................................... 24
6.5 DQ Mapping to Support CRC.................................................................................... 25
6.6 DIMM Routing Space Constraints............................................................................. 28
6.7 DIMM Physical Requirements................................................................................... 29
6.7.1 Via Size .........................................................................................................................29
6.7.2 Component Pad Sizes and Geometry...........................................................................29
6.7.3 SDRAM Package Size ..................................................................................................29
6.7.4 Clock Termination .........................................................................................................29
6.7.5 DQ Resistor...................................................................................................................29
6.8 RDIMM Configuration................................................................................................ 30
6.8.1 Control Wiring................................................................................................................30
6.8.2 AVDD Filter Circuit, Placement and Wiring ................................................................... 31
6.8.3 ZQ Calibration Wiring ....................................................................................................32
6.8.4 ALERT_n Circuit Wiring ................................................................................................32
6.8.5 TEN Pin Wiring ..............................................................................................................32
6.9 SPD-TSE Selection, Wiring and Placement.............................................................. 33
7 Serial Presence Detect (Pending Separate Ballot) ............................................... 34
7.1 Serial Presence Detect Definition ............................................................................. 34
8 Product Label ........................................................................................................ 37
9 JEDEC Process..................................................................................................... 41
JEDEC Standard No. 21C
Page 4.20.28-3
Release 25A Revision 1.10
List of Tables
Table 1 — DDR4 Product Family Attributes ..................................................................................................... 5
Table 2 — Environmental Parameters ............................................................................................................. 6
Table 3 — Pin Definition................................................................................................................................... 7
Table 4 — Input/Output Functional Description................................................................................................ 8
Table 5 — DDR4 288 Pin RDIMM Pin Wiring Assignments........................................................................... 10
Table 6 — DDR4 RDIMM DC Operating Voltage1,2,3 - 1.2 V operation ....................................................... 12
Table 7 — DDR4 x4 SDRAM DIMM Pad Array.............................................................................................. 16
Table 8 — DDR4 x8 SDRAM DIMM Pad Array.............................................................................................. 17
Table 9 — RDIMM Decoupling Capacitor Guidelines .................................................................................... 18
Table 10 — Simulation Conditions ................................................................................................................. 20
Table 11 — Example PreRegister ADD/CMD and CTRL Definition............................................................... 21
Table 12 — Example PreRegister CK Length ................................................................................................ 21
Table 13 — Example PostRegister ADD/CMD Definition............................................................................... 22
Table 14 — Example DQ Definition................................................................................................................ 23
Table 15 — Plane Referencing ...................................................................................................................... 24
Table 16 — DIMM Wiring Definition for Address Mirroring............................................................................. 24
Table 17 — SPD DQ Nibble Map for CRC ..................................................................................................... 25
Table 18 — Nibble/Byte DQ Map Patterns for CRC....................................................................................... 26
Table 19 — Example of DQ Mapping for CRC............................................................................................... 27
Table 20 — Routing Space Constraints ......................................................................................................... 28
Table 21 — SPD Address Map ...................................................................................................................... 34
Table 22 — Block 0: Base Configuration and SDRAM Parameters ............................................................... 34
Table 23 — Preproduction Registration Definition ......................................................................................... 39
Revision 1.10 Release 25A
JEDEC Standard No. 21C
Page 4.20.28-4
List of Figures
Figure 1 — Graphical View of Recommended Power Up Sequence ............................................................. 13
Figure 2 — Graphical View of Recommended Power Down Sequence......................................................... 13
Figure 3 — DIMM Ball Patterns for DDR4 SDRAM Components................................................................... 15
Figure 4 — Example RDIMM Topologies ....................................................................................................... 19
Figure 5 — Example PreRegister ADD/CMD and CTRL Diagram ................................................................. 21
Figure 6 — Example PreRegister CK Diagram .............................................................................................. 21
Figure 7 — Example PostRegister ADD/CMD Diagram .................................................................................22
Figure 8 — Example DQ Net Structure .......................................................................................................... 23
Figure 9 — Example of DQ Wiring with Mapping for CRC ............................................................................. 27
Figure 10 — DDR4 SRx8 Control Wiring........................................................................................................ 30
Figure 11 — DDR4 SRx4 Control Wiring........................................................................................................ 30
Figure 12 — DDR4 DRx8 Control Wiring ....................................................................................................... 30
Figure 13 — DDR4 2R/4R/8R/16R (planar/3DS) Control Wiring.................................................................... 31
Figure 14 — DDR4 2R VLP (DDP) Control Wiring ......................................................................................... 31
Figure 15 — AVDD Filter Circuit Wiring.......................................................................................................... 31
Figure 16 — Example Wiring of the ALERT_n Function ................................................................................ 32
Figure 17 — Block Diagram: SPD-TSE and DDR4RCD01 ............................................................................ 33
JEDEC Standard No. 21C
Page 4.20.28-5
Release 25A Revision 1.10
1 Product Description
This specification defines the electrical and mechanical requirements for 288-pin, 1.2 Volt (VDD), Registered,
Double Data Rate, Synchronous SDRAM Dual In-Line Memory Modules (DDR4 SDRAM RDIMMs). These
DDR4 Registered DIMMs (RDIMMs) are intended for use as main memory when installed in PCs.
Reference design examples are included which provide an initial basis for DDR4 RDIMM designs.
Modifications to these reference designs may be required to meet all system timing, signal integrity and
thermal requirements for PC4-1600, PC4-1866, PC4-2133, PC4-2400, PC4-2666, PC4-2933 and PC4-3200
support. All DDR4 RDIMM implementations must use simulations and lab verification to ensure proper timing
requirements and signal integrity in the design.
This specification follows the JEDEC standard DDR4 component specification (refer to JEDEC standard
JESD79-4, at www.jedec.org).
Table 1 — DDR4 Product Family Attributes
DIMM Organization x72 ECC Notes
DIMM Dimensions
(nominal)
133.35 mm x 31.25 mm Refer to MO-309
133.35 mm x 18.75 mm Refer to MO-309
Pin Count 288
DDR4 SDRAMs Sup-
ported
4 Gb, 8 Gb, 16 Gb
78/106-ball FBGA package for x4 and x8 devices.
Refer to MO-207: variations DT-z, DW-z
Capacity 16 GB, 32 GB, 64 GB, 128 GB
SDRAM width x4, x8
Serial Presence Detect,
Thermal Sensor (SPD-
TSE)
512 byte TSE2004av specifications
Voltage Options
VDD: PC4 - 1.2 V ± 5%
VPP: 2.5 V + 10%, - 5%
The VPP supply has VSS as its return path. VPP is a separate
supply, VDDSPD.
VDDSPD: 2.5 V ± 10%
The VDDSPD supply has VSS as its return path. VDDSPD is
separate from the VPP power plane. VDDSPD is shared
between the SPD-TSE and the RCD (register). The RCD only
supports 2.5 V.
12 V ± 15% May be available on the connector but not used by RDIMMs
Interface 1.2 V signaling
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