FW82371EB Q 657 Intel, FW82371EB Q 657 Datasheet - Page 24

• Manufacturer Part Number: FW82371EB Q 657
• Manufacturer: Intel

Specifications of FW82371EB Q 657

• Lead Free Status / RoHS Status: Not Compliant

Intel
14.
Problem:
Implication: If the system is in a state where USB clocks are running, such as normal or LVL3 power managed states,
Workaround: 1. Ensure that USB peripheral devices do not support remote wake-up (peripheral workaround), or
Status:
15.
Problem:
Implication: This signal is typically used in Dual Processor capable systems and is connected to an IOAPIC. If the
Workaround: Program the appropriate input of the IOAPIC to active level HI.
Status:
24
®
82371EB (PIIX4E)
USB Resume from Selective Suspend
A USB resume sequence signaled by a downstream device, from the PIIX4E, may not be properly
detected by the PIIX4E if the USB clock is running and the USB port is in a Selective Suspend mode. A
combination of VCRS level and device speed (HS/LS) may allow the PIIXE to detect a SE1 level on a
USB clock edge which the PIIX4E resume detect hardware cannot recognize.
Symptoms include either HC responds to downstream J to K transition by driving K state, but does not
set PORTSC[Resume_Detect], or the HC does not respond to downstream J to K transition by driving K
state back onto the cable. These symptoms will manifest themselves as either the PIRQD interrupt will
not assert and not interrupt or wake the system, or polling of PORTSC will never return a detect response
and the K state will remain driven by the HC and locked up.
and the USB port is in Selective Suspend mode, a resume attempt initiated by the USB device, such as a
keyboard, may not be detected and the suspended port may not resume. This failure to resume will
prevent normal operation of the affected USB device, and if in a power managed state where USB clocks
are still running, the system may not be awaken. In this case, the user will have to awaken the system
another way and may have to un-plug and re-install the USB device to get it to work.
2. Do not use the Selective Suspend feature of the PIIX4E, use only Global Suspend (OS workaround).
This will not be fixed in the PIIX4E.
IRQ9OUT# is Active HI
The signal identified as IRQ9OUT#/GPO29, pin F3, is not active level LO, it is active level HI, when
APIC Chip Select (XBCS[8]) is set.
IOAPIC input is programmed for level LO, and SCI’s or SM Bus events in the PIIX4 are programmed to
be reported on IRQ9OUT, devices using these will not be recognized by the IOAPIC and will not work
correctly.
This will not be fixed in the PIIX4. This will be incorporated into the PIIX4 datasheet as a Specification
Change.
Specification Update
R