MPL460AT-ISLASH4LB datasheet(19/48 Pages) MICROCHIP

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PL460

Bootloader

Data Sheet

DS60001666D - 19

7.4.

Functional Description

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

The external host can access the instruction memory, data memory, and registers through SPI. The

bootloader only works in SPI Mode 0 (CPHA = 1 and CPOL = 0). The basic data transfer is shown in

the figure below:

Data read

MISO

S31

S18

d30

d31

d29

SCK

MOSI

A30

A31

C15

D30

D31

D29

Bootloader HW signature

ADDRESS

COMMAND

DATA WRITE

The basic frame sent from the host through the MOSI signal is composed as shown in the following

table:

Address

Command

Data

32-bit block

16-bit block

n blocks of 32 bits

All the blocks in the basic frame sent by MOSI use little-endian format.

Each frame received from the host will be acknowledged with a 32-bit signature through the MISO

signal.

The bootloader supports a series of SPI commands, which are listed in the table below.

Command Description

addr(31:0)

data(n*32-1:0)

0x0000

Write word on one address

0xAAAAAAAA (Note 1) 0xDDDDDDDD (Note 2)

0x0001

Write words on consecutive addresses

0xAAAAAAAA (Note 1) 0xDDD…DDD (Note 2, 3)

0x0002

Read words on consecutive addresses

0xAAAAAAAA (Note 1)

0x000…000 (Note 4)

0x0003

Read word on one address

0xAAAAAAAA (Note 1)

0x00000000

0x0004

Write number of decryption packets

0x00000000

0x0000DDDD (Note 2)

0x0005

Write decryption initial vector

0x00000000

0xDDD…DDD (Note 2, 3)

0x0006

Write decryption signature

0x00000000

0xDDD…DDD (Note 2, 3)

0x0007

Write 128 bit fuses value to Buffer register

0x00000000

0xDDD…DDD (Note 2, 3)

0x0008

Write Buffer register to Tamper register for KEY_ENC_FUSES

0x00000000

0x0009

Write Buffer register to Tamper register for KEY_TAG_FUSES

0x00000000

0x000B Write Buffer register to Tamper register for CONTROL_FUSES

0x00000000

0x000C Blow desired fuses

0x00000000

0x000D Write KEY_ENC_FUSES to the corresponding Tamper register

0x00000000

0x000E

Write KEY_TAG_FUSES to the corresponding Tamper register

0x00000000

0x0010

Write CONTROL_FUSES to the corresponding Tamper register

0x00000000

0x0011

Read Tamper register

0x00000000

0x000…000 (Note 4)

0x0012

Read bootloader status

0x00000000

0x0013

Start Decryption

0x00000000

0x0014

Start/Stop BOOTLOADER access window in Host mode

0x00000000

0x0015

Start Decryption Plus

0x00000000

0xA55A Control of MISO signal transferred to M7-SPI

0x00000000

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