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TMDSCNCD28388D: Resistors R3-R8 usage.

Part Number: TMDSCNCD28388D
Other Parts Discussed in Thread: TMDSCNCD28379D


I'm designing a board based on TMS320F28388, so i'm taking a look into the control card TMDSCNCD28388D as design reference. 

There are some resistors R3, R4, R5, R6, R7 and R8, with a value of 39R, in series with GPIOs 59, 61 ,64 ,66, 70 and 72. 

¿Can anyone tell me what is the purpose of this resistors? 

I've checked that those pins are used for High-Speed SPI, specifically SPIx_SOMI and SPIx_STEn, so at first I thought that the series resistors where the typical way of reducing EMI and ringing. But this resistors are not placed on GPIOs 92 and 94 (SPID_SOMI and SPID_STEn), while the electrical characteristics are the same.

Thanks in advance.