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This annex defines the electrical and mechanical requirements for Raw Card C, 260-pin, 1.2 Volt (VDD), Small Outline, Double Data Rate, Synchronous DRAM Dual In-Line Memory Modules (DDR4 SDRAM SODIMMs). These DDR4 SODIMMs are intended for use as main memory when installed in PCs, laptops, and other systems. Item 2228.31B

Committee(s): JC-45.3

JESD21-C Solid State Memory Documents Main Page

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This annex defines the electrical and mechanical requirements for Raw Card C, 288-pin, 1.2 Volt (VDD), Unbuffered, Double Data Rate, Synchronous DRAM Dual In-Line Memory Modules (DDR4 SDRAM UDIMMs). These DDR4 Unbuffered DIMMs (UDIMMs) are intended for use as main memory when installed in PCs. Item 2231.37

Committee(s): JC-45.3

JESD21-C Solid State Memory Documents Main Page

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This specification defines the electrical and mechanical requirements for Raw Card D, 288-pin, 1.2 Volt (VDD), Load Reduced, Double Data Rate, Synchronous DRAM Dual In-Line Memory Modules (DDR4 SDRAM LRDIMMs). These DDR4 Load Reduced DIMMs (LRDIMMs) are intended for use as main memory when installed in PCs. Item 2204.23

Committee(s): JC-45.4

JESD21-C Solid State Memory Documents Main Page

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This specification defines the electrical and mechanical requirements for Raw Card D, 288-pin, 1.2 Volt (VDD), Registered, Double Data Rate, Synchronous DRAM Dual In-Line Memory Modules (DDR4 SDRAM RDIMMs). These DDR4 Registered DIMMs (RDIMMs) are intended for use as main memory when installed in PCs. Item 2149.08c

Committee(s): JC-45, JC-45.1

JESD21-C Solid State Memory Documents Main Page

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This specification defines the electrical and mechanical requirements for Raw Card E, 260-pin, 1.2 Volt (VDD), Small Outline, Double Data Rate, Synchronous DRAM Dual In-Line Memory Modules (DDR4 SDRAM SODIMMs). These DDR4 SODIMMs are intended for use as main memory when installed in PCs, laptops, and other systems. Item 2228.33C.

Committee(s): JC-45.3

JESD21-C Solid State Memory Documents Main Page

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This specification defines the electrical and mechanical requirements for Raw Card E, 288-pin, 1.2 Volt (VDD), Registered, Double Data Rate, Synchronous DRAM Dual In-Line Memory Modules (DDR4 SDRAM RDIMMs). These DDR4 Registered DIMMs (RDIMMs) are intended for use as main memory when installed in PCs. Committee Item 2149.34a

Committee(s): JC-45.1

JESD21-C Solid State Memory Documents Main Page

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Item 2228.02

Committee(s): JC-45.3

JESD21-C Solid State Memory Documents Main Page

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Release No. 18

Committee(s): JC-45, JC-45.1

JESD21-C Solid State Memory Documents Main Page

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This annex defines the electrical and mechanical requirements for Raw Card G, 260-pin, 1.2 Volt (VDD), Small Outline, Double Data Rate, Synchronous DRAM Dual In-Line Memory Modules (DDR4 SDRAM SODIMMs). These DDR4 SODIMMs are intended for use as main memory when installed in PCs, laptops, and other systems. Item No. 2228.34C

Committee(s): JC-45.3

JESD21-C Solid State Memory Documents Main Page

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Item 2228.28. Editorial

This specification defines the electrical and mechanical requirements for Raw Card H, 260-pin, 1.2 Volt (VDD), Small Outline, Double Data Rate, Synchronous DRAM Dual In-Line Memory Modules (DDR4 SDRAM SODIMMs). These DDR4 SODIMMs are intended for use as main memory when installed in PCs, laptops, and other systems.

Committee(s): JC-45.3

JESD21-C Solid State Memory Documents Main Page

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Release No. 21

Item 2082.93

Committee(s): JC-45, JC-45.1

JESD21-C Solid State Memory Documents Main Page

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Release No. 21.
Item 2145.12A, 2145.30

Committee(s): JC-45, JC-45.1

JESD21-C Solid State Memory Documents Main Page

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This revision is to add R/C K1 for up to
PC4-3200 support for the DDR4 SO-DIMM R/C K Annex. Item 2228.68.

Committee(s): JC-45.3

JESD21-C Solid State Memory Documents Main Page

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Release No. 18

Committee(s): JC-45, JC-45.1

JESD21-C Solid State Memory Documents Main Page

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Committee Document Reference Title: LPDDR3 and LPDDR4 SPD Document Release 1
Device Type Identifier: LP-DIMM Revision 1.0

This Annex describes the serial presence detect (SPD) values for all LPDDR modules. Differences between module types are encapsulated in subsections of this annex. These presence detect values are those referenced in the SPD standard document for ‘Specific Features’. The following SPD fields will be documented in the order presented in Section 2, with the exception of bytes 128~255 which are documented in separate sections, one for each family of module types. Further description of Byte 2 is found in Annex A of the SPD standard. Item 2254.01

Committee(s): JC-45

JESD21-C Solid State Memory Documents Main Page

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Release No. 21
Item 2145.27

Committee(s): JC-45.1

JESD21-C Solid State Memory Documents Main Page

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Release No. 19

Committee(s): JC-45.1, JC-45

JESD21-C Solid State Memory Documents Main Page

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This standard specifies the host and device interface for a DDR4 NVDIMM-N, which is a DIMM that achieves non-volatility by copying SDRAM contents into non-volatile memory (NVM) when host power is lost using an Energy Source managed by either the module or the host. This standard is used in conjunction with JESD248. Item 2233.54G

Committee(s): JC-45.6

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This standard defines the specifications of interface parameters, signaling protocols, environmental requirements, packaging, and other features as reference for specific target implementations of CXL™-attached memory modules.

The purpose is to provide certain reference base targets for CXL™-attached memory modules to enable system design simplification, multiplicity of sources, elimination of confusion, ease of device specification, and ease of use.

Committee(s): JC-45

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