MPL460AT-ISLASH4LB datasheet(18/48 Pages) MICROCHIP

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PL460

Bootloader

Data Sheet

DS60001666D - 18

Bootloader

7.1.

Description

The bootloader loads the program from an external host to the internal memory of the PL460. It

allows loading of plain programs or secured programs. When a secured program is loaded, the

original program length must be padded to become a multiple of 16 bytes, and the length (number

of blocks, where a block is a 16 byte set) must be specified for correct signature validation and

decryption.

Signature uses AES128 CMAC. Signature can be calculated over the {Encrypted Software} or over

{Encrypted Software + Initialization Vector + Number of Blocks-1}. The number of blocks for

signature calculation will be specified as a 16 byte integer number in the {image}, although the

number is programmed as a 16-bit integer in the corresponding register of the bootloader.

Decryption of the secured program uses AES128 CBC.

When secured software transfer has been selected, system operation will not start unless signature

validation and decryption pass correctly.

The bootloader also allows programming of security keys and security control fuses.

7.2.

Embedded Characteristics

• Bootloader operates on SCK (typical frequency 12 MHz, maximum frequency ≤16 MHz)

synchronously with core and bus clocks

• Fixed phase and polarity SPI control protocol

• Password to unlock bootloader

• Fuse programming control

7.3.

Block Diagram

Figure 7-1. Block Diagram

HOST

NRST

SPI

Hardwired Bootloader &

Fuse Programmer

CPU

RAM

firmware

code

r/w

AES CBC+CMAC

plain

mode

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