MPL460AT-ISLASH4LB datasheet(21/48 Pages) MICROCHIP

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PL460

Bootloader

Data Sheet

DS60001666D - 21

7.4.2.

Bootloader Hardware Signature

Each frame received from the host (write or read frame) will be acknowledged with a 32-bit

signature through the MISO signal. This is used to give the bootloader’s signature and the state

of the system to the host.

This frame is composed of the following:

MISO

B31

B16

B17

B14

B15

B12

B13

B10

B11

SCK

MOSI

A31

A16

A17

A14

A15

A12

A13

A10

A11

A0 C15

BOOT_SIGN

RST_STATUS

RESERVED

FREE

AES

Bit

Name

Value

31..17

BOOT_SIGN

010101100011010

RST_STATUS

USER_RST

CM7_RESET

WDT_RESET

BOOT_FUSE

—

CHIP_ID

—

RESERVED

—

HSM_FUSE

—

AES_FUSES

AES_DIS

AES_128

7..2

RESERVED

—

1..0

FREE_FUSES

—

7.4.3.

Write Process

The command used to write on a unique address is CMD = 0x0000.

The command used to write on several consecutive addresses is CMD = 0x0001. In this case, it will

be sent the 32 bits of the initial address, 16 bits of the command (0x0001) and as many consecutive

words (32 bits) as are wanted to write.

Regarding the decryption packets, the commands to write the number of decryption packets (CMD

= 0x0004), the initial vector of decryption (CMD = 0x0005) or the decryption signature to test if

decryption is correct (CMD = 0x0006), the address of the frame is not taken into account and it can

be composed of any address value. To write the decryption packet, only the last 15 bits are taken

into account. In the case of decryption initial vector and decryption signature where it is necessary

to send the 128-bit value as data, it is made in the same way as the write process at consecutive

addresses, sending 4 consecutive words (32 bits).

To write a fuse box, the Buffer register must be written in advance (CMD = 0x0007) and then

the Tamper registers of KEY_ENC_BOX, KEY_TAG_BOX or CONTROL_BOX must be written with the

content of the buffer (CMD = 0x0008, CMD = 0x0009 and CMD = 0x000B respectively). Finally, to

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