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10
Computing and Viewing Decoded Transactions
In the Transaction Decode tab, you can view the PRDT entries associated to an ATA command that
utilizes PRDT entries such as an AHCI ATA Identify command or AHCI Read FPDMA Queued
command.
To view the decoded PRDT entries of an ATA command
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Right-click the transaction displayed for the command in the Transaction Decode tab.
Select Visualize Transaction...
A dialog box is displayed with applicable PRDT transactions and other related transactions for
the ATA command. In the following example, the three transactions for reading the PRD table for
the Read FPDMA Queued command are highlighted. Clicking one of these PRDT transactions
displays the raw payload for that PRDT Read transaction in the lower pane.
Expand each of the displayed PRDT read transactions in the left to view the PRDT entries used for
the data transfer. In the following example, the 16 PRDT entries applicable for the first PRDT read
transaction are highlighted. With each PRDT entry, its base address, bytes count, and the
number of PCIe TLPs utilized for data transfer are also displayed.
Keysight U4301 PCIe Gen3 Analyzer User's Guide
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