CEC1702 datasheet(16/30 Pages) MICROCHIP

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CEC1702 Efuse Generator Tool User’s Guide

DS50002598A-page 16

 2017 Microchip Technology Inc.

4. The CEC1702 Efuse Generator Tool generates a warning message shown in

Figure 2-8: “Warning Message Before Generating The Keys” and described

in step 26. This message could be disabled using the “Disable Warning mes-

sage” select option provided in settings window in Figure 2-2: “Openssl Tool

Path Setting”.

5. Set the output directory path as described in section 2.1.2 “Output Files”.

6. Select Disable ATE radio button to bring the chip out of the ATE mode after Efuse

/ OTP programming. See Figure 2-4: “Sample CEC1702 Efuse Generator

Tool Entry” for reference.

7. If there are more programming steps, you may choose to leave ATE Mode

enabled.

8. Select JTAG Disable radio button to disable the JTAG interface after Efuse pro-

gramming. See Figure 2-4: “Sample CEC1702 Efuse Generator Tool Entry”

for reference.

9. Our recommendation is to disable JTAG mode after all the programming is com-

pleted in production.

10. JTAG mode allows you to choose between SWD (2-Wire) or JTAG(4-wire) mode.

This option is only available when JTAG is Enabled. One may use this on engi-

neering parts for run time debug.

11. In case you would like to have authentication enabled, select the “Authentication”

Enable radio button. This will in turn enable the firmware Header and Image sign-

ing.

12. Only when authentication is enabled, one can generate the ECDSA Key. See

Figure 2-4: “Sample CEC1702 Efuse Generator Tool Entry” for reference.

13. If authentication of the firmware binary is enabled, in the field marked “ECDSA

Key filename”, enter the file name for the ECDSA Key. One just needs to enter

the key file name without an extension. For example: myECDSAkey. See Figure

2-4: “Sample CEC1702 Efuse Generator Tool Entry” for reference.

14. The “ECDSA Password” field will be used to protect the ECDSA Key using

AES-256-CBC encryption. The generated Keys and Signatures will be encrypted

using AES-256-CBC encryption mode and stored in the output directory. See

Figure 2-4: “Sample CEC1702 Efuse Generator Tool Entry” for reference.

15. If ECC encryption Keys are required, select the “Use ECC Encryption Keys”

select button. This will enable entry into the “ECDH Key filename” field. See Fig-

ure 2-4: “Sample CEC1702 Efuse Generator Tool Entry” for reference.

16. If “Use ECC Encryption Keys” is selected, enter the file name for the ECDH Key.

One just needs to enter the key file name without an extension. For example:

myECDHkey. See Figure 2-4: “Sample CEC1702 Efuse Generator Tool

Entry” for reference.

17. The “ECDH Password” field will be used to protect the ECDH Key using

AES-256-CBC encryption. The generated Keys and Signatures will be encrypted

using AES-256-CBC encryption mode and stored in the output directory.

18. If the user wishes to use alternate Tag0, select “Alternate Tag0”.

19. If “Alternate Tag0” is enabled, alternate TAG fields will be added to the Efuse

data. The user needs to provide bits [23:8] for the Alternate TAG address. The

field must be written with hexadecimal values. For example: If the address in SPI

Flash is 0xAABBCC00, the user needs to write alternate tag field with 0xBBCC

value. See Figure 2-4: “Sample CEC1702 Efuse Generator Tool Entry” for

reference.

20. If the user wishes to program the custom space in Efuse / OTP, one must select

the “Use Custom space” field. See Figure 2-4: “Sample CEC1702 Efuse Gen-

erator Tool Entry” for reference.

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