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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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The following labels shall be applied to all CXL memory modules to fully describe the key attributes of the module. The label can be in the form of a stick-on label, silk screened onto the assembly, or marked using an alternate customer-readable format.

Committee(s): JC-45

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This standard describes the serial presence detect (SPD) values for all DDR5 memory modules. In this context, “modules” applies to memory modules like traditional Dual In-line Memory Modules (DIMMs) or solder-down motherboard applications. The SPD data provides critical information about all modules on the memory channel and is intended to be used by the system's BIOS in order to properly initialize and optimize the system memory channels.

Committee(s): JC-45

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This annex JESD309-S0-RCB, DDR5 Small Outline Dual Inline Memory Module with 0-bit ECC (EC0 SODIMM) Raw Card B Annex" defines the design detail of x8, 2 Package Ranks DDR5 NECC SODIMM. The common feature of DDR5 SODIMM such as the connector pinout can be found in the JESD309, DDR5 Small Outline Dual Inline Memory Module (SODIMM) Common Standard.

Committee(s): JC-45.3

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This annex JESD308-U0-RCA, DDR5 Unbuffered Dual Inline Memory Module (UDIMM) Raw Card AAnnex defines the design detail of x8, 1 Package Rank DDR5 UDIMM. The common feature of DDR5 UDIMM such as the connector pinout can be found in the JESD308, DDR5 Unbuffered Dual Inline Memory Module (UDIMM) Common Standard. Item 2265.13A

Committee(s): JC-45.3

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This annex JESD308-U0-RCB, DDR5 Unbuffered Dual Inline Memory Module (UDIMM) Raw Card B Annex defines the design detail of x8, 2 Package Ranks DDR5 UDIMM. The common feature of DDR5 UDIMM such as the connector pinout can be found in the JESD308, DDR5 Unbuffered Dual Inline Memory Module (UDIMM) Common Standard. Item 2265.11A

Committee(s): JC-45.3

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This annex JESD309-S4-RCE, DDR5 Small Outline Dual Inline Memory Module with 4-bit ECC (EC4SODIMM) Raw Card E Annex" defines the design detail of x8, 2 Package Ranks DDR5 ECC SODIMM. The common feature of DDR5 SODIMM such as the connector pinout can be found in the JESD309, DDR5 Small Outline Dual Inline Memory Module (SODIMM) Common Standard.

Committee(s): JC-45, JC-45.3

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This annex JESD309-S0-RCC, DDR5 Small Outline Dual Inline Memory Module (SODIMM) Raw CardC Annex defines the design detail of x16, 1 Package Ranks DDR5 SODIMM. The common feature of DDR5 SODIMM such as the connector pinout can be found in the JESD309, DDR5 Small Outline Dual Inline Memory Module (SODIMM) Common Standard.

Committee(s): JC-45, JC-45.3

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This standard, JESD305-R8-RCC, DDR5 Registered Dual Inline Memory Module with 8-bit ECC (EC8 RDIMM) Raw Card C Annex, defines the design detail of x4, 1 Package Rank DDR5 RDIMM with 8-bit ECC. The common feature of DDR5 RDIMM, such as the connector pinout, can be found in the JESD305, DDR5 Load Reduced (LRDIMM) and Registered Dual Inline Memory Module (RDIMM) Common Standard. Item 2273.12.

Committee(s): JC-45.1

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This standard, JESD305-R8-RCE, DDR5 Registered Dual Inline Memory Module with 8-bit ECC (EC8 RDIMM) Raw Card E Annex, defines the design detail of x8, 2 Package Ranks DDR5 RDIMM with 8-bit ECC. The common feature of DDR5 RDIMM, such as the connector pinout, can be found in the JESD305, DDR5 Load Reduced (LRDIMM) and Registered Dual Inline Memory Module (RDIMM) Common Standard. Item 2273.13.

Committee(s): JC-45.1

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This standard, JESD305-R8-RCD, DDR5 Registered Dual Inline Memory Module with 8-bit ECC (EC8 RDIMM) Raw Card D Annex, defines the design detail of x8, 1 Package Rank DDR5 RDIMM with 8-bit ECC. The common feature of DDR5 RDIMM, such as the connector pinout, can be found in the JESD305, DDR5 Load Reduced (LRDIMM) and Registered Dual Inline Memory Module (RDIMM) Common Standard. Item 2273.03

Committee(s): JC-45.1

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Item 2273.16

Committee(s): JC-45.1

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This standard defines the electrical and mechanical requirements for 288-pin, 1.1 Volt (VDD and VDDQ), DDR5 Registered (RDIMM) and Load Reduced (LRDIMM), Double Data Rate (DDR), Synchronous DRAM Dual In-Line Memory Modules (DIMM). These 288-pin Registered and Load Reduced DDR5 SDRAM DIMMs are intended for use in server, workstation, and database environments. Item 2273.07.

Committee(s): JC-45.1

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Release No. 31. Item 2131.03, 2078.04, 2131.06This revision contains terminology updates only.

Committee(s): JC-45, JC-45.2, JC-45.3

JESD21-C Solid State Memory Documents Main Page

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Release 31. Item 2029.04This revision contains terminology updates only.

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 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 document defines the electrical and mechanical requirements for Raw Card B, 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 2231.26.

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), 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 2232.20.

Committee(s): JC-45.4

JESD21-C Solid State Memory Documents Main Page

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This document defines the electrical and mechanical requirements for Raw Card A, 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. Committee Item 2231.38A.

Committee(s): JC-45.3

JESD21-C Solid State Memory Documents Main Page

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