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QPHY-SAS3 Software Option

Tx Group 4 Tx Emphasis

There are 3 tests run in this group. The tests that are run are:

1. Tx Emphasis Off (IDLE_REF0)

2. Tx Emphasis Ref1 (IDLE_REF1)

3. Tx Emphasis Ref2 (IDLE_REF2)

Each of these tests are described in detail in the following sections.

These tests are run when the DUT is outputting IDLE dwords under defined conditions for the precursor,

central, and postcursor equalization coefficients with the transmitter set to its maximum peak voltage.

These tests all require the use of the SAS3_EYEOPENING script which is run via Matlab. See the How

to run the SAS3_EYEOPENING script section of this manual for more information

The purpose of these tests is to verify the precursor equalization ratio (Rpre) and postcursor equalization

ratio (Rpost) are within the specification limits. Additionally, these tests will measure VMA and VHL.

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Teledyne-lecroy QPHY-SAS3 Manuale Utente Pagina 33