1.0 - SATA-IO

Tektronix, Inc.Figure 2.3. Single-ended impedance measurements using Z-line tool of IConnect (TX-02). Minimumimpedance for positive line is 49 Ohm, while for negative line the value is 42.4 Ohm.Observable Results:The Single-Ended Impedance for the PUT TX port shall be at least 40 ohms for Gen1i and Gen1m devicesrunning at 1.5Gb/s.Possible Problems:1. Data noise may cause impedance waveform to oscillate. This is resolved by selecting a higher“Threshold” number for Z-line computations.2. First incident step needs to be windowed out; otherwise the measurement will not be accurate. Thecorrect acquisition window settings are shown in Figure 2.2.3. When the transmitter does not support “disconnect” operation the test setup described in the AppendixD can be used.4. Some PUTs showed significant oscillations at the termination level of the TDR response due tointeractions with Tx pattern, they can be reduced by changing the internal clock of the TDR from200kHz to 100kHz.SATA Rx/Tx MOI Revision 1.1 ver 1.012