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DP83867IRRGZR 开发手册 - TI（德州仪器）
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TI（德州仪器）
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接口芯片
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VQFN-48
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具有工业级温度范围的耐用型千兆位以太网 PHY 收发器 48-VQFN -40 to 85
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DP83867IRRGZR数据手册
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SFD Measurement Results
6 SFD Measurement Results
The end to end latency of a link can be measured by the delay from the transmit SFD on one device to the
receive SFD of a second device. For real-time systems and systems implementing the IEEE 1588
Precision Time Protocol, this measurement could be made by comparing the timestamps of the two SFDs.
Start of Frame was measured using the configuration previously described in Section 4. The test setup
consisted of two DP83867 boards connected via a 1m cable. Transmit data was provided to the Device
under Test (DUT). Data received by the link partner was looped back to the link partner transmit pins via a
wiring harness. In this way, all four SFDs could be measured relative to one another.
In the test setup, the end to end latencies were measured using an oscilloscope. The latency
measurements were calculated as:
• DUT TX SFD to Partner RX SFD (shown as C1->C4 in the oscilloscope shots below)
• Partner TX SFD to DUT RX SFD (shown as C3->C2 in the oscilloscope shots below)
Figure 4. Start of Frame Measurement
Ch1: DUT TX SFD
Ch2: DUT RX SFD
Ch3: Partner TX SFD
Ch4: Partner RX SFD
Data taken for 100 consecutive links with oscilloscope configured for infinite persistence. Variation in the
repeatability of the SFDs would be indicated by multiple edges on the rising edges of the SFD pulses.
Note that there is no variation for the SFDs see Figure 4.
5
SNLA242–October 2015 How to Configure DP83867 Start of Frame Detect
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