SAM9G20 Atmel Corporation, SAM9G20 Datasheet - Page 79

• Manufacturer Part Number: SAM9G20
• Manufacturer: Atmel Corporation

Specifications of SAM9G20

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 96
• Ext Interrupts: 96
• Usb Transceiver: 3
• Usb Speed: Full Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 1
• Uart: 7
• Ssc: 1
• Ethernet: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: Yes
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 95
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 0.9 to 1.1
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

13.6
6384E–ATARM–05-Feb-10
DataFlash Boot Sequence
Figure 13-6. Serial Flash Download
The DataFlash boot looks for a valid application in the SPI DataFlash memory.
SPI0 is configured in master mode to generate a SPCK at 8 MHz. DataFlash shall be connected
to NPCS0 or NPCS1.
The DataFlash boot reads the DataFlash flash status register (Instruction code 0xD7). The Data-
Flash is considered as ready if bit 7 of the returned status register is set.
If no DataFlash is connected or if it does not answer, DataFlash boot exits after 1000 attempts.
If the DataFlash is ready, DataFlash boot reads the first 8 words into SRAM (Instruction code
“Continuous Read Array” 0x0b) and checks if it corresponds to valid exception vectors according
to the Valid Image detection algorithm.
Read the SerialFlash into the internal SRAM.
Restore the reset value for the peripherals.
Set the PC to 0 and perform the REMAP
to jump to the downloaded application
Read the first 8 instructions (0x0b).
(code size to read in vector 6)
Send status command (0x05)
Decode the sixth ARM vector
(except vector 6) are LDR
or Branch instruction
Is status OK ?
8 vectors
Start
End
Yes
Yes
No
No
Jump to next boot
AT91SAM9G20
solution
79