Diag margin test

Diags tab contains 2 sets of testing scenarios: Tx Eye and Rx Eye.

The TxEye test collects the transmit eye associated with a specific byte and bit. The eye is measured by running traffic while varying the DRAM VREF and Phy’s TxDq delay settings. The test records how many errors occur at each delay and voltage setting and returns a matrix of encoded error counts.

The RxEye test collects the receive eye associated with a specific byte and bit. The eye is measured by running traffic while varying the Phy’s VREF and RxClkDly delay settings. The test records how many errors occur at each delay and voltage setting and returns a matrix of encoded error counts.


Figure 1. Example Messageblock ErrorCount Output

In Chose Test tab 2 dropdown options are available: Byte lane and Bit lane to configure Rx/Tx Eye test. After configuring connection, Start Validation can be performed. After successful run, eye diagram with golden coordinates will be displayed in Result tab.