82801FB Datasheet, PDF (190/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Functional Description
5.17.4.2.4
5.17.4.3
When the controller is put into D3, it is assumed that software has properly shut down the device
and disabled the ports. Therefore, there is no need to sustain any values on the port wires. The
interface will be treated as if no device is present on the cable, and power will be minimized.
When returning from a D3 state, an internal reset will not be performed.
Non-AHCI Mode PME# Generation
When in non-AHCI mode (legacy mode) of operation, the SATA controller does not generate
PME#. This includes attach events (since the port must be disabled), or interlock switch events (via
the SATAGP pins).
SMI Trapping (APM)
Device 31:Function2:Offset C0h (see Section 12.1.40) contain control for generating SMI# on
accesses to the IDE I/O spaces. These bits map to the legacy ranges (1F0–1F7h, 3F6h, 170–177h,
and 376h). If the SATA controller is in legacy mode and is using these addresses, accesses to one of
these ranges with the appropriate bit set causes the cycle to not be forwarded to the SATA
controller, and for an SMI# to be generated. If an access to the Bus-Master IDE registers occurs
while trapping is enabled for the device being accessed, then the register is updated, an SMI# is
generated, and the device activity status bits (Section 12.1.41) are updated indicating that a trap
occurred.
5.17.5
SATA LED
The SATALED# output is driven when the BSY bit is set in any SATA port. The SATALED# is an
active-low open-collector output. When SATALED# is low, the LED should be active. When
SATALED# is high, the LED should be inactive.
5.17.6 AHCI Operation
The ICH6R/ICH6-M provides hardware support for Advanced Host Controller Interface (AHCI), a
new programming interface for SATA host controllers developed thru a joint industry effort. AHCI
defines transactions between the ICH6R/ICH6-M 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 (e.g., an AHCI
driver) and for some features, hardware support in the SATA device or additional platform
hardware.
The ICH6R/ICH6-M supports all of the mandatory features of the Serial ATA Advanced Host
Controller Interface specification, rev 1.0 and many optional features, such as hardware assisted
native command queuing, aggressive power management, LED indicator support, and Hot-Plug
thru 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 for the associated
port. See section 7.3.1 of the AHCI Specification for more information.
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Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet