r)
                                                (XPUF_READ_FROM_EFUSE_CACHE)
 This selects the location from where the helper data must be read by the
 application. This option must be configured if XPUF_KEY_GENERATE_OPTION
 is configured as XPUF_REGEN_ON_DEMAND.</pre><pre> #define XPUF_CHASH                             (0x00000000)
 The length of CHASH should be 24 bits. It is valid only for PUF regeneration
 and invalid for PUF registration. CHASH value should be supplied if
 XPUF_READ_HD_OPTION is con