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Chapter 4: UEFI BIOS
Power Down Mode
Use this feature to set the Clock-Enable (CKE) power down mode. When this feature is
set to No Power Down, CKE is disabled. When this feature is set to Active Power-down
(APD), open pages are retained when de-asserting CKE. When this feature is set to
Pre-charged Power-down (PPD) Delayed-locked Loop off (DLLoff), DDR enters a deep
power-down state when all rows are pre-charged. PDD_DLLoff saves more power than
No Power Down and APD. The options are Auto, No Power Down, APD, PPD-DLLoff.
Page Close Idle Timeout
Use this feature to set if memory controller should force open pages to close after an
idle cycle threshold is exceeded. The options are Disabled and Enabled.
Memory Scrambler
Use this feature to enable or disable memory scrambler support for memory error cor-
rection. The options are Disabled and Enabled.
Force ColdReset
Use this feature when ColdBoot is required during MRC execution. The options are
Enabled and Disabled.
Force Single Rank
Use this feature to force DIMMs to use a single rank. When enabled, only Rank0 will be
use in each DIMM. The options are Disabled and Enabled.
MRC Fast Boot
This feature enables or disables fast path through the MRC. The options are Disabled
and Enabled.
PEG Port Configuration
M.2-C PCIe 4.0 x4
This feature indicates if M.2-C is present.
PCI Express Root Port 1
Use this feature to disable or enable the PCIe root port. The options are Disabled and
Enabled.
ASPM
Use this feature to set the Active State Power Management level. The options are Dis-
abled, L0s, L1, and L0sL1.
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