1.6. Test Result Comments
In each test case, the RX JESD204B IP core successfully initialize from CGS phase, ILA phase, and until user data phase. No data integrity issue is observed by the PRSB checker. For test case with LMF = 211, the data rate is reduced to 2457 Mbps to limit the ADC sample clock to less than 250 MHz. The following table describes the scenarios where there is a difference in the data rate.
|Item||Scenario 1||Scenario 2||Remark|
|Data rate||4915 Mbps||2457 Mbps||Data rate is within the operating condition of AD9250.|
|Link clock = data rate/40||122.88 MHz||61.44 MHz||Link clock frequency is determined by the data rate.|
|ADC sample clock must be ≤ ADC maximum sampling rate||491.52 MHz||245.76 MHz||Sample clock frequency in scenario 1 is beyond the operating condition of AD9250.|
The link clock count variation in the deterministic latency measurement is caused by the word alignment, where control characters fall into the next cycle of data some time after realignment. This makes the duration of the ILAS phase longer by one link clock some time after reset.
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