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Connect AD5372 EBZ evaluation board to Rpi 4 through SPI

Product Number: AD5372-EBZ

Hey guys. I'm currently  trying to control a AD5372EBZ evaluation board through SPI protocol, by using a Rpi model 4 as a controller. and i have a couple of questions.

First of all, i found zero reference to the J4 header pins in the manual. Do they have any function at all ?

Also, in order to use to control the board through SPI, do I connect the board to the Rpi using the j3 header pins  and by removing the cap from the LK1 pin, or do i need to do something else?

Last but not least, can i use what any gpio pin in the rpi to produce the LDAC,Reset,BUSY and CLEAR signlas, or do i have to use a specific one ?