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M13L2561616A-2A Datasheet(PDF) 13 Page - Elite Semiconductor Memory Technology Inc.

Part No. M13L2561616A-2A
Description  Double-data-rate architecture, two data transfers per clock cycle
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Manufacturer  ESMT [Elite Semiconductor Memory Technology Inc.]
Direct Link  http://www.esmt.com.tw/index.asp
Logo ESMT - Elite Semiconductor Memory Technology Inc.

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ESMT
M13L2561616A (2A)
Elite Semiconductor Memory Technology Inc.
Publication Date : Sep. 2012
Revision : 1.0
13/49
Basic Functionality
Power-Up and Initialization Sequence
DDR SDRAM must be powered up and initialized in a predefined manner. Operational procedures other than those specified
may result in undefined operation. No power sequencing is specified during power up and power down given the following
criteria:
VDD and VDDQ are driven from a single power converter output, AND
VTT is limited to 1.8 V, AND
VREF tracks VDDQ /2
OR, the following relationships must be followed:
VDDQ is driven after or with VDD such that VDDQ < VDD + 0.3 V, AND
VTT is driven after or with VDDQ such that VTT < VDDQ + 0.3 V, AND
VREF is driven after or with VDDQ such that VREF < VDDQ + 0.3 V.
At least one of these two conditions must be met.
Except for CKE, inputs are not recognized as valid until after VREF is applied. CKE will detect an LVCMOS LOW level after VDD
is applied. Maintaining an LVCMOS LOW level on CKE during power-up is required to guarantee that the DQ and DQS outputs
will be in the High-Z state, where they will remain until driven in normal operation (by a read access).
After all power supply and reference voltages are stable, and the clock is stable, the DDR SDRAM requires a 200 μs delay prior
to applying an executable command. Once the 200 μs delay has been satisfied, a DESELECT or NOP command should be
applied, and CKE should be brought HIGH.
Following the NOP command, a PRECHARGE ALL command should be applied. Next a MODE REGISTER SET command
should be issued for the Extended Mode Register, to enable the DLL, and then a MODE REGISTER SET command should be
issued for the Mode Register, to reset the DLL, and to program the operating parameters. 200 clock cycles are required
between the DLL reset and any executable command. A PRECHARGE ALL command should be applied, placing the device in
the ”all banks idle” state.
Once in the idle state, two AUTO refresh cycles must be performed. Additionally, a MODE REGISTER SET command for the
Mode Register, with the reset DLL bit deactivated (i.e., to program operating parameters without resetting the DLL) must be
performed.
Following these cycles, the DDR SDRAM is ready for normal operation.


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