Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK データシート

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SAM9X25 [DATASHEET]

11054E–ATARM–10-Mar-2014

Two kinds of SPI Flash are supported: SPI Serial Flash and SPI DataFlash.

The SPI Flash bootloader tries to boot on SPI0 Chip Select 0, first looking for SPI Serial Flash, and then for SPI 
DataFlash.

It uses only one valid code detection: analysis of ARM exception vectors.

The SPI Flash read is done by means of a Continuous Read command from address 0x0. This command is 0xE8 for 
DataFlash and 0x0B for Serial Flash devices.

The SPI Flash Boot program supports all Atmel DataFlash devices.

The SPI Flash Boot program supports all SPI Serial Flash devices responding correctly at both Get Status and 
Continuous Read commands.

The TWI EEPROM Bootloader uses the TWI0. It uses only one valid code detection. It analyzes the ARM exception 
vectors.

TWI EEPROM Boot supports all I

2

C-compatible TWI EEPROM memories using 7-bit device address 0x50.

The NVM drivers use several PIOs in peripheral mode to communicate with external memory devices. Care must be 
taken when these PIOs are used by the application. The devices connected could be unintentionally driven at boot time, 
and electrical conflicts between output pins used by the NVM drivers and the connected devices may occur.

To assure correct functionality, it is recommended to plug in critical devices to other pins not used by NVM.

 contains a list of pins that are driven during the boot program execution. These pins are driven during the boot 

sequence for a period of less than 1 second if no correct boot program is found.

AT45DB011

1 Mbit

264

512 

AT45DB021

2 Mbits

264

1024

AT45DB041

4 Mbits

264

2048 

AT45DB081

8 Mbits

264

4096

AT45DB161

16 Mbits

528

4096

AT45DB321

32 Mbits

528

8192 

AT45DB642

64 Mbits

1056

8192