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AT91SAM9G20 bảng dữ liệu(PDF) 79 Page - ATMEL Corporation

tên linh kiện AT91SAM9G20
Giải thích chi tiết về linh kiện  AT91 ARM Thumb Microcontrollers
PDF  832 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT91SAM9G20 bảng dữ liệu(HTML) 79 Page - ATMEL Corporation

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79
6384D–ATARM–04-May-09
AT91SAM9G20 Preliminary
Figure 13-6. Serial Flash Download
13.6
DataFlash Boot Sequence
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.
End
Read the first 8 instructions (0x0b).
Decode the sixth ARM vector
Yes
Read the SerialFlash into the internal SRAM.
(code size to read in vector 6)
Restore the reset value for the peripherals.
Set the PC to 0 and perform the REMAP
to jump to the downloaded application
Send status command (0x05)
8 vectors
(except vector 6) are LDR
or Branch instruction
Yes
Start
Is status OK ?
Jump to next boot
solution
No
No



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