Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Field
Subsystem RID 2 16 Subsystem Revision ID
Byte0 is Non-Volatile Memory Subsystem Controller Revision
Code defined by DDR4 SPD field 198 (per JEDEC SPD Annex
L: Serial Presence Detect for DDR4 SDRAM NVDIMM
Revision 0.5 or greater (Item 2220.01).
Byte1 is reserved
Reserved 6 18
Serial Number 4 24 This field reflects the value of Module Serial Number (SPD
Byte 325-328) from DDR4 SPD field as defined by JEDEC
SPD Annex L: Serial Presence Detect for DDR4 SDRAM
DDR4 SPD Document Release 2.
Region Format
Interface Code
Number of Block
Control Windows
Size of Block
Control Window
Command
Register Offset in
Block Control
Window
Size of Command
Register in Block
Control Windows
Status Register
Offset in Block
Control Window
Size of Status
Register in Block
Control Windows
NVDIMM Control
Region Flag
Byte
Length
Reserved 6 74
Byte
Offset
Description
2 28 Region Format Interface Code consists of a Class Code and an
Interface Code as defined by JJEDEC SPD Annex L: Serial
Presence Detect for DDR4 SDRAM NVDIMM Revision 0.5 or
greater (Item 2220.01). Allows a common driver for the
Memory Device region based on class code and interface code
(regardless of vendor ID and device ID).
2 30 Number of Block Control Windows must match the
corresponding number of Block Data Windows. Fields that
follow this field are valid only if the number of Block Control
Windows is non-zero.
8 32 In Bytes
8 40 In Bytes.
Logical offset. Refer to Note. The start of the subsequent Block
Control Windows is calculated by adding Size of Block Control
Window.
8 48 In Bytes
8 56 In Bytes.
Logical offset. Refer to Note1. The start of the subsequent
Block Control Window is calculated by adding Size of Block
Control Window.
8 64 In Bytes
2 72 Bit [0] – set to 1 to indicate that the Block Data Windows
implementation is buffered. The content of the data window is
only valid when so indicated by Status Register.
Note: Logical offset in structure above refers to offset from the start of NVDIMM Control Region. The
logical offset is with respect to the device not with respect to system physical address space.
210 April, 2015 Version 6.0