MPL460A-ISLASH4LB datasheet(23/48 Pages) MICROCHIP

23 / 48 page

PL460

Bootloader

Data Sheet

DS60001666D - 23

Control Fuses (continued)

Fuse Bit

Name

Description

WRITE_AES_KEY If it is set, KEY_ENC and KEY_TAG cannot be written

READ_CONTROL If it is set, CONTROL_FUSES cannot be read

WRITE_CONTROL If it is set, CONTROL_FUSES cannot be written

READ_RAM

If it is set, memory ram cannot be read

RESERVED

Reserved

RESERVED

Reserved

FORCE_IVNBINC If it is set, initialization vector and number of blocks must be used in the calculation of the

signature

RESERVED

Reserved

RESERVED

Reserved

RESERVED

Reserved

RESERVED

Reserved

RESERVED

Reserved

DBG_DISABLE If it is set, JTAG debug is disabled

DBG_DISABLE_SE Reserved

7.4.7.

Decryption

After writing the full encrypted binary in the program RAM, decryption of the program is launched.

There are two options depending on the content of the encrypted program, which has been loaded.

If the KEY_TAG includes only the program, basic decryption is required (CMD = 0x0013).

If the KEY_TAG includes the program plus initial vector and total number of packets, decryption plus

is required (CMD = 0x0015).

In both cases, neither address nor data are considered.

If FORCE_IVNBINC fuse is set to ‘1’, both decryption commands (CMD = 0x0013 and CMD = 0x0015)

will calculate the signature over SOFT+IV+NB.

7.4.8.

Examples

7.4.8.1. Write a Non-encrypted Program

Command

Description

0x00000000_DE05_5345ACBA

After Reset, unblock the bootloader

0x00000000_DE05_ACBA5345

0x00000000_0001_DDDDDDDD…

Write the program at consecutive addresses from 0x00000000

0x00000000_0002_XXXXXXXX…

(Optional) Read the program to validate it (READ_RAM fuse must be not set)

0x400E1800_0000_00000000

Clear CPUWAIT to start program operation

0x00000000_A66A_00000000

Give control of the MISO signal to M7-SPI and disable bootloader clock

7.4.8.2. Write an Encrypted Program when Keys are already Written

Command

Description

0x00000000_DE05_5345ACBA

After Reset, unblock the bootloader

0x00000000_DE05_ACBA5345

0x00000000_0004_0000XXXX

Set the number of blocks of the encrypted program

0x00000000_0005_XXXXXXXX XXXXXXXX

XXXXXXXX XXXXXXXX

Set the initialization vector of the encrypted program

0x00000000_0006_XXXXXXXX XXXXXXXX

XXXXXXXX XXXXXXXX

Set signature of the encrypted program

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