SAM9G25 Atmel Corporation, SAM9G25 Datasheet - Page 438

• Manufacturer Part Number: SAM9G25
• Manufacturer: Atmel Corporation

Specifications of SAM9G25

• Flash (kbytes): 0 Kbytes
• Pin Count: 247
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 105
• Ext Interrupts: 105
• Usb Transceiver: 3
• Usb Speed: Hi-Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 3
• Uart: 7
• Lin: 4
• Ssc: 1
• Ethernet: 1
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: Yes
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 440
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: DDR2/LPDDR, SDRAM/LPSDR
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 0.9 to 1.1
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

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SAM9G25
SAM9G25
After initialization, the DDR2-SDRAM devices are fully functional.
19. A mode Normal command is provided. Program the Normal mode into Mode Register
20. Perform a write access to any DDR2-SDRAM address.
21. Write the refresh rate into the count field in the Refresh Timer register (see
(see
address to acknowledge this command.
(Refresh rate = delay between refresh cycles). The DDR2-SDRAM device requires a
refresh every 15.625 μs or 7.81 μs. With a 133 MHz frequency, the refresh timer count
register must to be set with (15.625*133 MHz) = 2079 i.e. 0x081f or (7.81*133 MHz) =
1039 i.e. 0x040f.
Section 30.7.1 on page
462). Perform a write access to any DDR2-SDRAM
11032A–ATARM–27-Jul-11
11032A–ATARM–27-Jul-11
page
463).