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setting quiescent SCK level for ni845x

I am trying to test a part using an NI8451 and have the ni845x.h hooked into my DLL code.  I am trying to use SPI mode 0 (clock polarity = 0 & clock phase = 0) but I see the NI8451 drive SCK high outside of a data packet and bring it low before CS_B is asserted and then back high again (looks like a pullup - possibly internal?) after CS_B is deasserted.  Is there a way to tell the NI8451 that the quiescent level should be low?

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