Teledyne LeCroy Protocol PCI Express Script Automation Test Tool - Manual (Page 41)

Teledyne LeCroy PCI Express Script Automation Test Tool User Manual
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3.2.1.3 Test 52-11. REPLAY_TIMER Test
ASSERTIONS COVERED: DLL.5.2#1.1
The intent of this test is to ensure that a DUT REPLAY_TIMER is working properly by not sending an ACK or
NAK.
Trainer Stimulus: link_52-11_REPLAY_TIMER.peg
Recording Options: link_layer.rec
Verification Scripts: link_52-11_REPLAY_TIMER.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 'Disable' 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 DUT retransmits the Memory Write TLP for which it received no ACK or NAK.
b) The DUT set only the ERR_CORR bit in its Device Status register.
c) The DUT did not set any error bits in the Advanced Uncorrectable Error Status register (if implemented).
d) The DUT set the “Replay Timer Timeout Status” bit in the Advanced Error Reporting Correctable Error Status
register (if implemented).
e) The DUT set the “Correctable Error Received” bit in the Root Error Status register (if implemented and
applicable).
If the DUT meets all these criteria, the DUT passes the test.