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SPI Clock Problem at 3Mhz

Question asked by golchha.vineet.001 on Dec 2, 2014
Latest reply on Aug 18, 2015 by Pankaj
HI Group,
    I have a development board which is acting as SPI Master connected to an STM32 chip on another prototype board acting as SPI slave. I cannot change anything on the development board.

I am facing an issue with SPI communication. When the data is sent at 100khz, 250khz anf 500khz, the data reaches the slave correctly. When I increase the frequency of SPI clock to 1Mhz and 3Mhz, then the data on the SPI slave starts getting corrupted.

I have captured the waveforms at all the mentioned frequencies from the developement board side and for 3Mhz from the STM32 side. Cable length from the development board to the prototype board is 6 inches.

In all the attachments:
Pink Line is MOSI
Blue line is SPI Clock

Please share your thoughts on how to resolve the issue?