Table 11: Basic Management Command (Address 0x6A) (Continued)
Command
Code Bytes Description
0 03 Composite Temperature (CTemp): This field indicates the current temperature in degrees
Celsius. If a temperature value is reported, it should be the same temperature as the Com-
posite Temperature from the SMART log of hottest controller in the NVM subsystem. The
reported temperature range is vendor specific, and shall not exceed the range -60 to
+127°C. The 8 bit format of the data is shown below.
This field should not report a temperature when that is older than 5 seconds. If recent da-
ta is not available, the NVMe management endpoint should indicate a value of 80h for this
field.
Value: Description
• 00h-7Eh: Temperature is measured in degrees Celsius (0 to 126C)
• 7Fh: 127C or higher
• 80h: No temperature data or temperature data is more the 5 seconds old.
• 81h: Temperature sensor failure
• 82h-C3h: Reserved
• C4: Temperature is -60C or lower
• C5-FFh: Temperature measured in degrees Celsius is represented in twos complement (-1
to -59C)
04 Percentage Drive Life Used (PDLU): Contains a vendor specific estimate of the percent-
age of NVM subsystem NVM life used based on the actual usage and the manufacturer’s
prediction of NVM life. If an NVM subsystem has multiple controllers the highest value is
returned. A value of 100 indicates that the estimated endurance of the NVM in the NVM
subsystem has been consumed, but may not indicate an NVM subsystem failure. The value
is allowed to exceed 100. Percentages greater than 254 shall be represented as 255. This
value should be updated once per power-on hour and equal the Percentage Used value in
the NVMe SMART Health Log Page.
06:05 Reserved: Shall be set to 0000h.
07 PEC: An 8 bit CRC calculated over the slave address, command code, second slave address
and returned data. Algorithm is in SMBus Specifications.
8 08 Length of identification: Indicates number of additional bytes to read before encoun-
tering PEC. Always 22 (16h) in this version of the spec.
10:09 Vendor ID: The 2 byte vendor ID, assigned by the PCI SIG. Should match VID in the Identi-
fy Controller command response. MSB is transmitted first.
30:11 Serial Number: 20 characters that match the serial number in the NVMe Identify Control-
ler command response. First character is transmitted first.
31 PEC: An 8 bit CRC calculated over the slave address, command code, second slave address
and returned data. Algorithm is in SMBus Specifications.
32+ 255:32 Vendor Specific
7100 U.2 NVMe PCIe SSD
Supported Commands
CCMTD-731836775-10498
7100_u2_nvme_pcie_ssd.pdf - Rev. G 03/17 EN
16
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