AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE User's Guide download pdf (Page 73)

Virtex-5 FPGA Integrated Endpoint Block www.xilinx.com 73

UG197 (v1.5) July 22, 2009

Error Detection

That the TC associated with each TLP is mapped to an enabled VC at an

Ingress Port. Any TLP that violates this rule is treated as a Malformed

TLP.

2.5.3 Required Endpoint block

Checks Made Regarding Flow Control

That the initial FC value is greater than or equal to the minimum

advertisement. Reported as a flow control protocol error. Requires

knowledge of the device and the Max Payload Size setting at the far end

of the link.

2.6.1 Optional User

That no receiver ever cumulatively issues more than 2047 outstanding

unused data credits or 127 outstanding unused header credits. Reported

as a flow control protocol error.

2.6.1 Optional Endpoint block

That if infinite credits are advertised during initialization, all updates

must also be infinite. Reported as a flow control protocol error. This also

applies where just a header or just the data has been advertised as

infinite.

2.6.1 Optional Endpoint block

That the VC used by a TLP has been enabled. Any TLP that violates this

rule is treated as a Malformed TLP.

2.6.1 Required Endpoint block

Receiver Overflow. The PCI Express Base Specification defines this as

happening where the number of TLPs exceeds

CREDITS_ALLOCATED.

However, the integrated Endpoint block reports where FIFO actually

overflows.

2.6.1.2 Optional Endpoint block

That Update FCPs are scheduled for transmission at the specified

interval. The integrated Endpoint block takes the option of employing a

200 µs watchdog timer.

2.6.1.2 Optional Endpoint block

Checks Made Regarding Data Integrity

Integrity of TD bit in messages received and forwarded by switches. Any

failed ECRC checks are reported.

2.7.1 Required Endpoint block

Receipt of a Poisoned TLP. 2.7.2.2 Required User

Checks Made Regarding Completion Timeout

That the completion timeout timer does not expire in less than 50 µs but

must expire if a request is not completed in 50 ms.

2.8 Required User

Checks Made Regarding LCRC and Sequence Number (TLP Transmitter)

REPLAY_NUM rolling over from 11b to 00b. Causes the Transmitter to:

(a) report an error; (b) signal the Physical Layer to retrain the Link.

3.5.2.1 Required Endpoint block

Retry buffer containing TLPs for which no Ack or Nak DLLP has been

received for a period exceeding specified maximum time. Causes the

Transmitter to: (a) report an error; (b) initiate a replay.

3.5.2.1 Required Endpoint block

Value in the CRC field of all received DLLPs compared with calculated

result. If not equal: (a) the DLLP is discarded as corrupt; (b) an error is

reported.

3.5.2.1 Required Endpoint block

Table 4-2: Error Checking Summary (Continued)

PCI Express

Specification

Section

Check is

Required

or Optional

Where Check is

Implemented

1 ... 72 73 74 ... 120

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