Datasheet

Functional Description
Intel® Xeon® Processor D-1500 Product Family 125
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
3.15.9 SATA LED
The SATALED# output is driven whenever the BSY bit is set in any SATA port. The
SATALED# is an active-low open-drain output. When SATALED# is low, the LED should
be active. When SATALED# is high, the LED should be inactive.
3.15.10 AHCI Operation
Intel® Xeon® Processor D-1500 Product Family provides hardware support for
Advanced Host Controller Interface (AHCI), a programming interface for SATA host
controllers developed through a joint industry effort. AHCI defines transactions
between the SATA controller and software and enables advanced performance and
usability with SATA. Platforms supporting AHCI may take advantage of performance
features such as no master/slave designation for SATA devices—each device is treated
as a master—and hardware assisted native command queuing. AHCI also provides
usability enhancements such as Hot-Plug. AHCI requires appropriate software support
(such as, an AHCI driver) and for some features, hardware support in the SATA device
or additional platform hardware.
Intel® Xeon® Processor D-1500 Product Family supports all of the mandatory features
of the Serial ATA Advanced Host Controller Interface Specification, Revision 1.3 and
many optional features, such as hardware assisted native command queuing,
aggressive power management, LED indicator support, and Hot-Plug through the use of
interlock switch support (additional platform hardware and software may be required
depending upon the implementation).
Note: For reliable device removal notification while in AHCI operation without the use of
interlock switches (surprise removal), interface power management should be disabled
Figure 3-9. Flow for Port Enable / Device Present Bits