C200 datasheet(23/82 Pages) INTEL

23 / 82 page

Specification Update

Errata

19.

Intel® AMT and Intel® Standard Manageability KT/SOL Interrupt

Status Cleared Prematurely

Problem:

A read of the Intel® AMT and Intel® Standard Manageability enabled SOL KTIIR (KT

Interrupt Identification Register) or KTLSR (KT Line Status Register) that occurs

simultaneous to the arrival of an SOL Host interrupt event may result in a read of the

Interrupt Status (INTSTS) bit 0 returning the status of “No Pending interrupt to Host”

despite KTLSR reporting a serviceable event.

Implication: Implication of a missed SOL Host interrupt is software implementation dependent.

Subsequent interrupts not aligned to a KTIIR or KTLSR read will clear “0” bit 0

(INTSTS) to indicate a pending interrupt to the Host.

Workaround: Software should not rely on reading only bit 0 (INTSTS) of the KTIIR register and

should also poll the KTLSR to determine if a SOL Host interrupt is pending.

Status:

No Plan to Fix.

20.

Incorrect IRQ(x) Vector Returned for 8259 Interrupts With RAEOI

Enabled

Problem:

If multiple interrupts are active prior to an interrupt acknowledge cycle with Rotating

Automatic End of Interrupt (RAEOI) mode of operation enabled for 8259 interrupts

(0-7), an incorrect IRQ(x) vector may be returned to the processor.

Implication: Implications of an incorrect IRQ(x) vector being returned to the CPU are SW

implementation dependent.

Note:

This issue has only been observed in a synthetic test environment.

Workaround: None.

Status:

No Plan to Fix.

21.

USB RMH False Disconnect Issue

Problem:

The PCH may falsely detect a USB High-Speed (HS) device disconnect if all of the

following conditions are met:

• The HS Device is connected through the Rate Matching Hub (RMH) of the PCH’s

EHCI controller.

• The device is resuming from selective suspend or port reset.

• The resume occurs within a narrow time window during the EOP (End of Packet)

portion of the SOF (Start of Frame) Packet on the USB bus.

Implication: Following the false disconnect, the HS device will be automatically re-enumerated. The

system implication will depend on the resume event cause:

• If the resume event is a port reset, a second port reset will be automatically

generated and the device re-enumerated. No end user impact is expected.

• If the resume event is a hardware or software initiated resume from selective

suspend, the implication will be device and software specific, which may result in

anomalous system behavior.

Note:

If the HS device is a hub, then all of the devices behind the hub, independent of the

device speed, may also be re-enumerated.

Workaround: None.

Status:

No Plan to Fix.

C200 Datasheet(PDF) 23 Page - Intel Corporation

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