Rainbow Electronics AT91CAP9S250A - Manual (Page 77)

77
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
Figure 14-5. Structure of the ARM Vector 6
14.4.2.1 Example
An example of valid vectors follows:
00 ea000006 B 0x20
04 eafffffe B 0x04
08 ea00002f B _main
0c eafffffe B 0x0c
10 eafffffe B 0x10
14 00001234 B 0x14 <- Code size = 4660 bytes
18 eafffffe B 0x18
The size of the image to load into SRAM is contained in the location of the sixth ARM vector.
Thus the user must replace this vector by the correct vector for his application.
14.4.3 DataFlash Boot Sequence
The DataFlash Boot program performs device initialization followed by the download
procedure.
The DataFlash Boot program supports all Atmel DataFlash devices. Table 14-2 summarizes
the parameters to include in the ARM vector 6 for all devices.
The DataFlash has a Status Register that determines all the parameters required to access
the device. The DataFlash Boot is configured to be compatible with the future design of the
DataFlash.
31 0
Size of the code to download in bytes
Table 14-2. DataFlash Device
Device Density Page Size (bytes) Number of Pages
AT45DB011B 1 Mbit 264 512
AT45DB021B 2 Mbits 264 1024
AT45DB041B 4 Mbits 264 2048
AT45DB081B 8 Mbits 264 4096
AT45DB161B 16 Mbits 528 4096
AT45DB321B 32 Mbits 528 8192
AT45DB642 64 Mbits 1056 8192