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Specification Update 39
BV63. PCIe* Root-port Initiated Compliance State Transmitter Equalization
Settings May be Incorrect
Problem: If the processor is directed to enter PCIe Polling.Compliance at 5.0 GT/s or 8.0 GT/s
transfer rates, it should use the Link Control 2 Compliance Preset/De-emphasis field
(bits [15:12]) to determine the correct de-emphasis level. Due to this erratum, when
the processor is directed to enter Polling.Compliance from 2.5 GT/s transfer rate, it
retains 2.5 GT/s de-emphasis values.
Implication: The processor may operate in Polling.Compliance mode with an incorrect transmitter
de-emphasis level.
Workaround: None identified.
Status: For the steppings affected, see the Summary Tables of Changes.
BV64. PCIe* Controller May Incorrectly Log Errors on Transition to RxL0s
Problem: Due to this erratum, if a link partner transitions to RxL0s state within 20 ns of entering
L0 state, the PCIe controller may incorrectly log an error in ?Correctable Error
Status.Receiver Error Status? field (Bus 0, Device 2, Function 0, 1, 2 and Device 6,
Function 0, offset 1D0H, bit 0).
Implication: Correctable receiver errors may be incorrectly logged. Intel has not observed any
functional impact due to this erratum with any commercially available add-in cards.
Workaround: None identified.
Status: For the steppings affected, see the Summary Tables of Changes.
BV65. Reception of Certain Malformed Transactions May Cause PCIe* Port to
Hang Rather Than Reporting an Error
Problem: If the processor receives an upstream malformed non posted packet for which the type
field is IO, Configuration or the deprecated TCfgRd and the format is 4 DW header, then
due to this erratum the integrated PCIe controller may hang instead of reporting the
malformed packet error or issuing an unsupported request completion transaction.
Implication: Due to this erratum, the processor may hang without reporting errors when receiving a
malformed PCIe transaction. Intel has not observed this erratum with any commercially
available device.
Workaround: None identified. Upstream transaction initiators should avoid issuing unsupported
requests with 4 DW header formats.
Status: For the steppings affected, see the Summary Tables of Changes.
BV66. PCIe* Link Width May Degrade After a Warm Reset
Problem: PCIe link width may degrade after a warm reset if the Link is operating at 8.0 GT/s or
5.0 GT/s transfer speeds prior to the reset.
Implication: Due to this erratum, the PCIe link may retain to a narrower width, e.g. from x16 to x4.
Workaround: A BIOS code change has been identified and may be implemented as a workaround for
this erratum. .
Status: For the steppings affected, see the Summary Tables of Changes.