AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 229
AT91SAM9G45-EKES
Manufacturer Part Number
AT91SAM9G45-EKES
Description
KIT EVAL FOR AT91SAM9G45
Manufacturer
Atmel
Series
AT91SAM Smart ARMr
Type
MCUr
Datasheets
1.AT91SAM9G45-EKES.pdf
(56 pages)
2.AT91SAM9G45-EKES.pdf
(1218 pages)
3.AT91SAM9G45-EKES.pdf
(66 pages)
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
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- Download datasheet (19Mb)
22. DDR/SDR SDRAM Controller (DDRSDRC)
22.1
6438F–ATARM–21-Jun-10
Description
The DDR/SDR SDRAM Controller (DDRSDRC) is a multiport memory controller. It comprises
four slave AHB interfaces. All simultaneous accesses (four independent AHB ports) are inter-
leaved to maximize memory bandwidth and minimize transaction latency due to SDRAM
protocol.The DDRSDRC supports a read or write burst length of 8 locations which frees the
command and address bus to anticipate the next command, thus reducing latency imposed by
the SDRAM protocol and improving the SDRAM bandwidth. Moreover it keeps track of the active
row in each bank, thus maximizing SDRAM performance, e.g., the application may be placed in
one bank and data in the other banks. So as to optimize performance, it is advisable to avoid
accessing different rows in the same bank. The DDRSDRC supports a CAS latency of 2 or 3 and
optimizes the read access depending on the frequency.
The features of self refresh, power-down and deep power-down modes minimize the consump-
tion of the SDRAM device.
The DDRSDRC user interface is compliant with ARM Advanced Peripheral Bus (APB rev2).
Note: The term “SDRAM device” regroups SDR-SDRAM, Mobile SDR-SDRAM, Mobile DDR1-
SDRAM and DDR2-SDRAM devices.
AT91SAM9G45
229
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