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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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AD4884BBCZ Arkusz danych(PDF) 78 Page - Analog Devices |
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AD4884BBCZ Arkusz danych(HTML) 78 Page - Analog Devices |
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78 / 116 page  Data Sheet AD4884 DIGITAL FEATURES analog.com Rev. 0 | 78 of 116 Asynchronous Read Access Access to the FIFO data is made through either a LVDS configura- tion (single lane only) or the multioutput SPI configuration of the data interface after the capture has completed. As a result, access is asynchronous to the capture process, and there are no specific timing restrictions between the conversion and interface clocks. Synchronization between the data FIFO and the data interface clock domain requires each read access to begin with a header followed by a transfer of M bytes of conversion data, where M equals the product of the total number of results specified in the FIFO_WATERMARK register (Address 0x1D and Address 0x1E) and the integer length in bytes (for SPI data interface) of a sin- gle conversion result. Note that the number of active data lanes reduces the access period by a factor of 2 for each doubling of the number of active lanes. Figure 123. Asynchronous Capture Read Timing, Data FIFO Enabled, Single Data Lane Figure 124. Asynchronous Capture Read Timing, Data FIFO Enabled, Quad Data Lane Configuration |
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