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I am trying to make a good layout for the LAN9252 mac and STM32F7 controller, running at 80 MHz and I had to route data tracks with different lengths.

The question is should I use nets lengths matching tool in QSPI at 80 MHz?

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  • \$\begingroup\$ STM32F7 from datasheet i see max SPI freq in any mode 54Mhz...I don't see QSPI support for it. \$\endgroup\$ – user19579 Oct 13 '18 at 3:22
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Normally with QSPI at 80MHz I would say your primary concern should be to keep the QSPI clock line and the longest data line as short as possible. As long as you keep these to just a few centimeters you will generally be fine.

Actual data line length matching become a concern if you push up your clock frequency even further, or go for DDR, and your QSPI master implements more advanced techniques such as a feedback clock or adaptive sampling clock.

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