Teledyne LeCroy QPHY-SAS3 - Manual (Page 33)

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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