at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 24

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

8.1.2.2
8.2
8.2.1
8.2.1.1
24
External Memories
AT91SAM9263 Preliminary
External Bus Interfaces
BMS = 0, Boot on External Memory
External Bus Interface 0
The customer-programmed software must perform a complete configuration.
To speed up the boot sequence when booting at 32 kHz EBI0 CS0 (BMS=0) the user must:
The external memories are accessed through the External Bus Interfaces 0 and 1. Each Chip
Select line has a 256 Mbyte memory area assigned.
Refer to
The AT91SAM9263 features two External Bus Interfaces to offer more bandwidth to the system
and to prevent bottlenecks while accessing external memories.
• Interface with SAM-BA
• Boot at slow clock
• Boot with the default configuration for the Static Memory Controller, byte select mode, 16-bit
1. Program the PMC (main oscillator enable or bypass mode).
2. Program and Start the PLL.
3. Reprogram the SMC setup, cycle, hold, mode timings registers for CS0 to adapt them
4. Switch the main clock to the new value.
• Integrates three External Memory Controllers:
• Additional logic for NANDFlash and CompactFlash
• Optional Full 32-bit External Data Bus
• Up to 26-bit Address Bus (up to 64 Mbytes linear per chip select)
• Up to 6 Chip Selects, Configurable Assignment:
• Optimized for Application Memory Space
data bus, Read/Write controlled by Chip Select, allows boot on 16-bit non-volatile memory.
– SPI DataFlash
– Serial communication on a DBGU
– USB Bulk Device Port
to the new clock.
– Static Memory Controller
– SDRAM Controller
– ECC Controller
– Static Memory Controller on NCS0
– SDRAM Controller or Static Memory Controller on NCS1
– Static Memory Controller on NCS2
– Static Memory Controller on NCS3, Optional NAND Flash support
– Static Memory Controller on NCS4 - NCS5, Optional CompactFlash support
Figure 8-1 on page
®
connected on NPCS0 of the SPI0
®
Graphic User Interface to enable code loading via:
20.
6249D–ATARM–20-Dec-07