AT91SAM9G46B-CU 查看數據表（PDF） - Atmel Corporation

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AT91SAM9G46B-CU

SMART ARM-based Embedded MPU

Atmel Corporation 

10.4.3 NVM Bootloader Sequence

Figure 10-7. NVM Bootloader Sequence Diagram

Device

Setup

NAND Flash Boot

Yes

Copy from

NAND Flash to SRAM

Run

NAND Flash Bootloader

No

SD Card Boot

Yes

Copy from

SD Card to SRAM

Run

No

SD Card Bootloader

SPI Flash Boot

Yes

Copy from

SPI Flash to SRAM

Run

No

TWI EEPROM Boot

Yes

Copy from

TWI EEPROM to SRAM

Run

No

SPI Flash Bootloader

TWI EEPROM Bootloader

SAM-BA

Monitor

10.4.3.1 NAND Flash Boot

The NAND Flash bootloader program uses the EBI CS3. It uses both valid code detections. First it searches a

boot.bin file. Then it analyzes the ARM exception vectors.

The first block must be guaranteed by the manufacturer. There is no ECC check.

After NAND Flash interface configuration, the Manufacturer ID is read. If it is different from 0xFF, the Device ID is

read, else, the NAND Flash boot is aborted. The Boot program contains a list of SLC small block Device ID with

their characteristics (size, bus width, voltage) (see Table 10-2). If the device ID is not found in this list, the NAND

Flash device is considered as an SLC large block and its characteristics are obtained by reading the Extended

Device ID byte 3.

SAM9G46 Series [DATASHEET]

65

Atmel-11028G-ATARM-SAM9G46-Datasheet_08-Dec-15

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