NQE7520MC S L7RD Intel, NQE7520MC S L7RD Datasheet - Page 20

• Manufacturer Part Number: NQE7520MC S L7RD
• Manufacturer: Intel

Specifications of NQE7520MC S L7RD

• Lead Free Status / RoHS Status: Compliant

Errata
34.
Problem:
Implication:
Workaround:
Status:
35.
Problem:
Implication:
Workaround:
Status:
20
Possible loss of Hot-swap Power Fault Event in dual PCI Express Hot-swap
port configurations
During boot, as part of normal PCI enumeration, the external hot-swap expander device on the PCI
Express hot-swap ports must be configured. This PCI enumeration proceeds on a per device basis,
during which an expander input change on the second port might get lost. There is sufficient time
between configuration of the first PCI Express hot-swap port and the second port for this erratum
to happen, due to interaction between the internal hot-swap controller and the external hot-swap
expander.
A power fault event, as an example, could occur on the second port before it was configured. The
power fault event is thus not reported.
Force the configuration of both hot-swap controllers to occur back-to-back in time. This prevents
any controller/expander traffic other than the configuration until both expanders have been
configured, and ensures that the controller and the external expander are in agreement. In BIOS,
make sure that setting the hot-swap capable bit for one of the hot-swap ports is followed
immediately by setting the same bit for the other hot-swap port.
For the steppings affected, see the Summary Table of Changes.
Memory initialization may fail at low temperatures
Some customers found that at lower temperatures the E7520 can encounter a Receive Enable
Calibration Failure.
The E7520 Memory Controller may not detect particular DQS lanes toggling for all DLL offsets
during the receive calibration at cold temps.
Upgrade the E7520 Memory Reference Code to version 1.05.
For the steppings affected, see the Summary Table of Changes.
Intel
®
E7520 Memory Controller Hub (MCH) Specification Update