Hello, I am designing board with Artix 7(XC7A200T) FPGA, and following Digilent's Nexys Video board schematic (attached). I am facing problem with configuration circuit (page 9) for permanent bit stream storage , problem with circuit is as I understand it is indirect configuration mode mean first we load some bit file i.e. (loader file) as given in nexys video reference manual (attached section 2.2) then we load our system bit file to store in SPI flash. I need some schematic of direct programming method of Artix 7 (XC7A200T) to program flash (either simple SPI or quad SPI flash) mean when jumper is one direction it only program FPGA and when jumper in other position it program SPI flash and on next time it take bitstream from SPI flash.
Second problem is can some one tell what is the purpose of Zener diode in parallel with JTAG pin and value of these zener diodes (same page 9 of schematic).