Please search the reference designs in the following ZC702 board link page http://www.xilinx.com/products/boards-and-kits/ek-z7-zc702-g.html#documentation . (In the above board link check the reference designs type in "Document Type" Box to view the example reference designs.
FYI: Refering the below topics gives more clarity about Zynq XC7Z020 reset ( watchdog )
Page 227 (8.2.3 Resets) in http://www.xilinx.com/support/documentation/user_guides/ug585-Zynq-7000-TRM.pdf.
Reset Effects table in page 678 in the above TRM is useful information
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