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External Memory Performance
Table 6-2: External Memory Interface Performance in Cyclone V Devices
The maximum and minimum operating frequencies depend on the memory interface standards and the supported
delay-locked loop (DLL) frequency listed in the device datasheet.
Minimum Frequency (MHz)
Maximum Frequency (MHz)
Voltage
(V)
Interface
Soft Controller
Hard Controller
303
303
400
1.5
DDR3 SDRAM
303
303
400
1.35
167
300
400
1.8
DDR2 SDRAM
167
300
333
1.2
LPDDR2 SDRAM
Related Information
•
External Memory Interface Spec Estimator
For the latest information and to estimate the external memory system performance specification, use
Altera's External Memory Interface Spec Estimator tool.
•
HPS External Memory Performance
Table 6-3: HPS External Memory Interface Performance
The hard processor system (HPS) is available in Cyclone V SoC devices only.
HPS Hard Controller (MHz)
Voltage (V)
Interface
400
1.5
DDR3 SDRAM
400
1.35
400
1.8
DDR2 SDRAM
333
1.2
LPDDR2 SDRAM
Related Information
External Memory Interface Spec Estimator
For the latest information and to estimate the external memory system performance specification, use Altera's
External Memory Interface Spec Estimator tool.
Memory Interface Pin Support in Cyclone V Devices
In the Cyclone V devices, the memory interface circuitry is available in every I/O bank that does not support
transceivers. The devices offer differential input buffers for differential read-data strobe and clock operations.
The memory clock pins are generated with double data rate input/output (DDRIO) registers.
External Memory Interfaces in Cyclone V Devices
Altera Corporation
CV-52006
External Memory Performance
6-2
2014.01.10