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H743ZI Full-duplex DMA communication. When the baud rate is 25M, the master and the slave can receive the data correctly. When 50M and 100M, the slave can receive the data correctly, but the master cannot receive the data correctly.

one V
Associate III

‎2021-12-04 02:20 AM

Use two NUCLEO-H743ZI boards for SPI communication. Full-duplex DMA mode. When the baud rate is 25M, the master and the slave can receive the data correctly. At 50M and 100M, the slave can receive the data correctly, but the master cannot receive the data correctly. Why?

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TDK
Guru

‎2021-12-04 05:55 AM

Sounds like a signal integrity issue. 100 MHz is high for transfers between boards connected by jumper wires.

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