DDR3 SDRAM
Key Properties
- 8-bit pre-fetch
- SSTL-15
- 800MHz per Pin
DDR3 SDRAM is an
improvement over its predecessor, DDR2 SDRAM and the two are not
compatible. The primary benefit of DDR3 is the ability to transfer at twice
the data rate of DDR2 (I/O at 8x the data rate of the memory cells it contains),
thus enabling higher bus rates and higher peak rates than earlier memory
technologies. In addition, the DDR3 standard allows for chip capacities of
512 megabits to 8 gigabits, effectively enabling a maximum memory module
size of 16 gigabytes.
DDR3 SDRAM
technology implies doubling of the internal bus width between the actual
DRAM core and the input/output buffer. As a result, the increase in the
efficient data transfer rate provided by DDR3 SDRAM doesn’t require faster
operation of the memory core. Only external buffers start working faster
DDR3 SDRAM Features
§ Introduction of asynchronous RESET pin
§ Support of system level flight time
compensation
§ On-DIMM Mirror friendly DRAM pin out
§ Introduction of CWL (CAS Write Latency)
per speed bin
§ On-die IO calibration engine
Advantages compared to DDR2
§ Higher bandwidth performance, up to 1600
MT/s standardized
§ Slightly improved latencies as measured in
nanoseconds
§ Higher performance at low power
§ Enhanced low power features
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