AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 235

• Manufacturer Part Number: AT91SAM9G45-EKES
• Description: KIT EVAL FOR AT91SAM9G45
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM9G45-EKES

• Contents: Board
• Processor To Be Evaluated: SAM9G45
• Data Bus Width: 32 bit
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 50 C
• Minimum Operating Temperature: - 10 C
• Operating Supply Voltage: 1.8 V to 3.3 V
• For Use With/related Products: AT91SAM9G45
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4626953

6438F–ATARM–21-Jun-10
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) = 1175 i.e. 0x0497 or (7.81 /133 MHz) =
587 i.e. 0x024B.
Section 22.7.1 on page
260). Perform a write access to any DDR2-SDRAM
AT91SAM9G45
page
261).
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