Rainbow Electronics AT91CAP9S250A - Manual (Page 79)

79
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
14.5.1 Supported NANDFlash Devices
Any 8 or 16-bit NANDFlash Devices from 1 Mbit to 16 Gbit density.
14.6 SAM-BA Boot
If no valid DataFlash device has been found during the DataFlash boot sequence, the SAM-
BA boot program is performed.
The SAM-BA boot principle is to:
– Check if USB Device enumeration has occured.
– Check if characters have been received on the DBGU.
– Once the communication interface is identified, the application runs in an infinite
loop waiting for different commands as in Table 14-4 .
• Write commands: Write a byte (O), a halfword (H) or a word (W) to the target.
– Address: Address in hexadecimal.
– Value: Byte, halfword or word to write in hexadecimal.
– Output: ‘>’.
• Read commands: Read a byte (o), a halfword (h) or a word (w) from the target.
– Address: Address in hexadecimal
Table 14-3. Supported NANDFlash Manufacturers
Manufacturer Identifier
Toshiba ® 0x98
Samsung ® 0xEC
Fujitsu 0x04
National Semiconductor ® 0x8F
Renesas 0x07
STMicroelectronics 0x20
Micron ® 0x2C
Table 14-4. Commands Available through the SAM-BA Boot
Command Action Argument(s) Example
O write a byte Address, Value# O200001,CA#
o read a byte Address,# o200001,#
H write a half word Address, Value# H200002,CAFE#
h read a half word Address,# h200002,#
W write a word Address, Value# W200000,CAFEDECA#
w read a word Address,# w200000,#
S send a file Address,# S200000,#
R receive a file Address, NbOfBytes# R200000,1234#
G go Address# G200200#
V display version No argument V#