参数资料
型号: IP-SDRAM/DDR2
厂商: Altera
文件页数: 70/106页
文件大小: 0K
描述: IP DDR2 SDRAM CONTROLLER
标准包装: 1
系列: *
类型: MegaCore
功能: DDR2 SDRAM 控制器
许可证: 初始许可证
3–34
Chapter 3: Functional Description
Parameters
Table 3–14 shows the memory initialization options.
Table 3–14. Memory Initialization Options
Parameter
ODT setting
Range
Disabled, 50, 75,
or 150
Units
Ω
Description
Enables on-die termination (ODT) resistance in the DDR2
SDRAM and enables dynamic control of it by the controller.
Choosing Disabled disable the on-die termination
resistance in the DDR2 SDRAM. The ddr2_odt control
signals are driven with a fixed value of zero.
Choosing 50 , 75 , or 150 Ω enables a 50-, 75-, or 150- Ω
ODT in the DDR2 SDRAM. The ddr2_odt signals enable
and disable the ODT as required.
CAS latency
2.0, 2.5, or 3.0
(for DDR
Cycles
The delay in clock cycles from the read command to the
first output data from the memory.
SDRAM);
3, 4, or 5
(for DDR2
SDRAM)
Burst length
2, 4, or 8 (for
DDR SDRAM);
4 (for DDR2
The number of data transfers between the FPGA and the
memory in each read or write transaction. The number of
transactions on the local interface is half this value.
SDRAM)
Burst type
Sequential or
Interleaved
This parameter is a memory Initialization option. Refer to
the memory vendor data sheet for the type of read and
writes transactions that it supports.
Controls the order in which data is transferred between
FPGA and memory during a read or write transaction.
Drive strength
Normal or
Reduced
Controls the drive strength of the memory device’s output
buffers. Reduced drive strength is not supported on all
memory devices.
Memory device DLL enable
On or off
When turned on, the DLL within the memory device is
enabled. This parameter is a memory Initialization option
and by default turn on this option. Memory vendors do
provide the option of not using the DLL within the memory,
but it is too difficult to perform memory transactions
without the DLL.
? March 2009 Altera Corporation
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