Serial Vector Format File (.svf) Definition
An ASCII text file (with the extension .svf) that stores
                  programming data for programming, verifying, and blank-checking one
                  or more fixed-algorithm devices in a JTAG chain in Automated Test
                  Equipment (ATE)-type programming environments. SVF Files contain
                  information such as the type of operation the SVF Files perform and
                  the JTAG TCK clock frequency of the SVF File. You can
                  program all Intel devices that support in-system programming (ISP)
                  with SVF Files. The JTAG chain can contain any combination of
                  Intel and non-Intel devices that comply with the IEEE 1149.1 JTAG
                  specification.
               
You can create SVF Files with the Create/Update > Create Jam, JBC, SVF, or ISC File command (File menu).
You can also create SVF Files using the Files tab of the Configuration Device Options dialog box, or using the Programming Files page of the Device and Pin Options dialog box.