Teledyne LeCroy Protocol PCI Express Script Automation Test Tool - Manual (Page 40)

Teledyne LeCroy PCI Express Script Automation Test Tool User Manual
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3.2.1.2 Test 52-10. RetransmitOnNak
ASSERTIONS COVERED: DLL.5.2#1
The intent of this test is to ensure that a DUT retransmits a transaction for which a NAK has been issued.
Trainer Stimulus: link_52-10_RetransmitOnNak.peg
Recording Options: link_layer.rec
Verification Scripts: link_52-10_RetransmitOnNak.pevs
Test Algorithm:
1. Issue command to the Driver to clear all error status bits for the Root or Switch port to which the Device
Emulator is attached.
2. Main test stage. Do the following:
a. Issue command to the Driver to perform 1-DWORD Memory Write to the Device Emulator.
b. Switch to the 'Always Nak' ACK/NAK policy.
c. Wait for the Memory Write TLP.
d. Switch back to the 'Automatic' ACK/NAK policy.
3. Issue command to the Driver to reflect the current values of the Error Reporting Registers for the port to
which the Device Emulator is attached (using Configuration Writes).
Pass/Fail Criteria:
Test should successfully progress though all test stages.
All test stages should be executed without protocol violations.
Verify that:
a) The Memory Write TLP for which a NAK is received is retransmitted by the DUT.
b) The DUT did not set any error bits in its Device Status register.
c) The DUT did not set any error bits in the Advanced Error Reporting registers (if implemented). This includes
Advanced Uncorrectable Error Status register, Advanced Correctable Error Status register and Root Error Status
register.
If the DUT meets all these criteria, the DUT passes the test.