AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 270

• 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

• TCR: Temperature Compensated Self Refresh
Reset value is “0”.
This field is unique to Low-power SDRAM. It is used to program the refresh interval during self refresh mode, depending
on the case temperature of the low-power SDRAM.
The values of this field are dependent on Low-power SDRAM devices.
After the initialization sequence, as soon as TCR field is modified, Extended Mode Register is accessed automatically and
TCR bits are updated. In function of UPD_MR bit, update is done before entering in self refresh mode or during a refresh
command and a pending read or write access.
• DS: Drive Strength
Reset value is “0”.
This field is unique to Low-power SDRAM. It selects the driver strength of SDRAM output.
After the initialization sequence, as soon as DS field is modified, Extended Mode Register is accessed automatically and
DS bits are updated. In function of UPD_MR bit, update is done before entering in self refresh mode or during a refresh
command and a pending read or write access.
• TIMEOUT
Reset value is “00”.
This field defines when low-power mode is enabled.
• APDE: Active Power Down Exit Time
Reset value is “1”.
This mode is unique to DDR2-SDRAM devices. This mode allows to determine the active power-down mode, which
determines performance versus power saving.
0 = Fast Exit
1 = Slow Exit
After the initialization sequence, as soon as APDE field is modified Extended Mode Register, located in the memory of the
external device, is accessed automatically and APDE bits are updated. In function of the UPD_MR bit, update is done
before entering in self refresh mode or during a refresh command and a pending read or write access
• UPD_MR: Update Load Mode Register and Extended Mode Register
Reset value is “0”.
This bit is used to enable or disable automatic update of the Load Mode Register and Extended Mode Register. This
update is function of DDRSDRC integration in a system. DDRSDRC can either share or not share an external bus with
another controller.
6438F–ATARM–21-Jun-10
00
01
10
11
00
01
10
11
The SDRAM controller activates the SDRAM low-power mode immediately after the end of the last transfer.
The SDRAM controller activates the SDRAM low-power mode 64 clock cycles after the end of the last transfer.
The SDRAM controller activates the SDRAM low-power mode 128 clock cycles after the end of the last transfer.
Reserved
Update is disabled.
DDRSDRC shares external bus. Automatic update is done during an refresh command and a pending read or write access in SDRAM device.
DDRSDRC does not share external bus. Automatic update is done before entering in self refresh mode.
Reserved
AT91SAM9G45
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