Altera Arria V Avalon-ST - Manual (Page 131)

Error Type Description
Malformed TLP Uncorrectable
(fatal)
This error is caused by any of the following conditions:
• The data payload of a received TLP exceeds the
maximum payload size.
• The
TD
field is asserted but no TLP digest exists, or a
TLP digest exists but the
TD
bit of the PCI Express
request header packet is not asserted.
• A TLP violates a byte enable rule. The Hard IP block
checks for this violation, which is considered
optional by the PCI Express specifications.
• A TLP in which the
type
and
length
fields do not
correspond with the total length of the TLP.
• A TLP in which the combination of format and type
is not specified by the PCI Express specification.
• A request specifies an address/length combination
that causes a memory space access to exceed a 4
KByte boundary. The Hard IP block checks for this
violation, which is considered optional by the PCI
Express specification.
• Messages, such as Assert_INTX, Power
Management, Error Signaling, Unlock, and Set
Power Slot Limit, must be transmitted across the
default traffic class.
The Hard IP block deletes the malformed TLP; it is not
presented to the Application Layer.
Note:
1. Considered optional by the PCI Express Base Specification Revision .
Error Reporting and Data Poisoning
How the Endpoint handles a particular error depends on the configuration registers of the device.
Refer to the PCI Express Base Specification 3.0 for a description of the device signaling and logging for an
Endpoint.
The Hard IP block implements data poisoning, a mechanism for indicating that the data associated with a
transaction is corrupted. Poisoned TLPs have the error/poisoned bit of the header set to 1 and observe the
following rules:
• Received poisoned TLPs are sent to the Application Layer and status bits are automatically updated in
the Configuration Space.
• Received poisoned Configuration Write TLPs are not written in the Configuration Space.
• The Configuration Space never generates a poisoned TLP; the error/poisoned bit of the header is
always set to 0.
8-6 Error Reporting and Data Poisoning
2014.12.15
Altera Corporation Error Handling
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