XilSKey_ZynqMp_EfusePs_ReadUserFuse - 2021.1 English

Xilinx Standalone Library Documentation OS and Libraries Document Collection (UG643)

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2021.1 English

This function is used to read a user fuse from the eFUSE or cache

Note: It is highly recommended to read from eFuse cache. Because reading from efuse may reduce the life of the efuse. And Cache reload is required for obtaining updated values for ReadOption 0.


u32 XilSKey_ZynqMp_EfusePs_ReadUserFuse(u32 *UseFusePtr, u8 UserFuse_Num, u8 ReadOption);


The following table lists the XilSKey_ZynqMp_EfusePs_ReadUserFuse function arguments.

Table 1. XilSKey_ZynqMp_EfusePs_ReadUserFuse Arguments
Type Name Description
u32 * UseFusePtr Pointer to an array which holds the readback user fuse.
u8 UserFuse_Num A variable which holds the user fuse number. Range is (User fuses: 0 to 7)
u8 ReadOption Indicates whether or not to read from the actual eFUSE array or from the eFUSE cache.
  • 0(XSK_EFUSEPS_READ_FROM_CACHE) Reads from eFUSE cache
  • 1(XSK_EFUSEPS_READ_FROM_EFUSE) Reads from eFUSE array


  • XST_SUCCESS on successful read
  • ErrorCode on failure