Programming the eFUSE Registers - 2024.1 English

Vivado Design Suite User Guide: Programming and Debugging (UG908)

Document ID
UG908
Release Date
2024-05-30
Version
2024.1 English

To program the eFUSE registers, right-click the FPGA in the Hardware window and select Program eFUSE Registers.

Figure 1. Select Program eFUSE Registers UltraScale and UltraScale+ Devices

The eFUSE Registers wizard is displayed as shown in the following figure and guides you to set the various options for the eFUSE registers.

Figure 2. Program eFUSE Registers Wizard

In the AES Key Setup pane, specify the following settings:

Figure 3. eFUSE Cryptographic Key Setup

In the Cryptographic Key Setup wizard pane, specify these key settings:

Cryptographic file key (.nky)
Specify a .nky file containing eFUSE AES and RSA keys.
AES Key (256-bit)
The 256-bit AES eFUSE key read in from specified .nky file used to decrypt loaded encrypted bitstream.
RSA Key Digest (384-bit)
The 384-bit RSA eFUSE key read in from specified .nky file used by RSA.
  • In the USER Register Setup wizard pane, specify the 32-bit USER or 128-bit USER register.

    Figure 4. eFUSE USER Register Setup

In the USER register setup pane specify user define register bits. The 32-bit USER (FUSE_USER) and 128-bit USER register (FUSE_USER128) registers are a set of user-defined one-time programmable eFUSE bits. The bits of these registers are cumulatively programmable. This means that if you program only one USER bit in an eFUSE programming session (for example, USER = 0x0000_0001 or bit 0), on subsequent eFUSE programming sessions you can program any of the remaining 0 bits (for example, USER = 0x0000_0002 or bit 1).

After programming the FUSE_USER and FUSE_USER_128 registers, these registers can be read in several ways:

  • Using the Tcl command
    report_property [lindex [get_hw_device] 0] REGISTER.EFUSE.FUSE_USER
    report_property [lindex [get_hw_devices] 0] REGISTER.EFUSE.FUSE_USER_128
  • Through the Vivado Hardware Device Properties window after running a refresh_hw_device operation.

In the Control Register Setup wizard pane, specify the following settings:

Figure 5. Control Register Setup Pane

In the Control Register Setup pane, specify the eFUSE control settings.

R_DIS_KEY
When set, disables CRC check that verifies the key and programming of the FUSE_KEY encryption key.
R_DIS_USER
When set, disables reading and programming the 32-bit user bits (FUSE_USER).
R_DIS_SEC
When set, disables reading and programming of the security register bits (FUSE_SEC).
R_DIS_RSA
When set, disables reading and programming of the RSA key register (FUSE_RSA).
W_DIS_USER
When set, disables programming of the 32-bit user bits (FUSE_USER).
W_DIS_SEC
When set, disables programming of the security register bits (FUSE_SEC).
W_DIS_RSA
When set, disables programming of the RSA key register (FUSE_RSA).
W_DIS_USER_128
When set, disables programming of the 128-bit user bits (FUSE_USER128).

For more details on the FUSE_SEC register refer to the UltraScale Architecture Configuration User Guide (UG570).