SAM9261 Atmel Corporation, SAM9261 Datasheet - Page 99

• Manufacturer Part Number: SAM9261
• Manufacturer: Atmel Corporation

Specifications of SAM9261

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 240 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: 4
• Ssc: 3
• Sd / Emmc: 1
• Graphic Lcd: Yes
• Video Decoder: No
• Camera Interface: No
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 160
• 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): 1.08 to 1.32
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 3
• Output Compare Channels: 3
• Input Capture Channels: 3
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

ARM DDI 0165B
Writes
When the ARM9E-S performs a byte or halfword write, the data being written is
replicated across the bus, as illustrated in Figure 4-7. The memory system can use the
most convenient copy of the data. A writable memory system must be capable of
performing a write to any single byte in the memory system. This capability is required
by the ARM C compiler and the Debug tool chain.
Copyright © 2000 ARM Limited. All rights reserved.
Byte writes
Halfword writes
Register[7:0]
Register[15:0]
ARM9E-S
ARM9E-S
C
A
B
A
B
D
Figure 4-7 Data replication
C
D
C
D
A
B
A
B
A
B
A
B
A
B
A
B
Memory interface
WDATA[31:24]
WDATA[23:16]
WDATA[15:8]
WDATA[7:0]
Memory interface
WDATA[31:16]
WDATA[15:0]
Memory Interface
4-23