One and two channel LPDDR up to 4 No published JEDEC standard exists. Specification or performance is subject to change without notice. Products and specifications discussed herein are subject to change by Micron without notice. Figure LPDDR to LPDDR Input Signal. Mobile DDR is a type of double data rate synchronous DRAM for mobile computers. A new JEDEC standard JESDE defines a more dramatically revised low-power DDR interface. . In comparison to LPDDR2, LPDDR3 offers a higher data rate, greater bandwidth . JEDEC is working on an LP-DDR5 specification.
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NOTE 4 Pull-down and pull-up output driver impedances are recommended to be calibrated at 0. For these state transitions, the burst operation must be completed before the transition can occur.
NOTE 2 The ratio of pull-up to pull-down slew rate is specified for the same temperature and voltage, over the entire temperature and voltage range. Any Activate or Precharge commands have executed to completion prior to stopping the clock;? One mode register unit is used for the programming of segment mask bits up to 8 bits. In both cases, the ZQ connection shall not change after power is applied to the device.
Each subsequent data-out speckfication on each DQ pin, edge-aligned with the data strobe. An uncontrolled power-off sequence can occur a maximum of times over the life of the device.
The appropriate interval between ZQCS commands can be determined from using these tables and system-specific parameters. Thus, the package may be connected in three ways:. VDDQ can be turned off during power-down.
The first cycle of a command is identified by chip select being high; it is low during the second cycle. Once tMRR has been met, the bank will be in the Active state.? Specificatioh rules are as follows: After Tz, the device is powered off see Table 1.
LOW POWER DOUBLE DATA RATE 3 SDRAM (LPDDR3)
The DRAM will also disable termination during read operations. Retrieved 28 July The clock is internally disabled during Self Refresh Operation to save power. Specifically, MR1, MR2, and MR3 must be set to configure the memory for the target frequency and memory configuration. NOTE 1 The differential signal i. Subsequent beats contain valid but undefined data. MRR operation consisting of the MRR command and the corresponding data traffic must not be interrupted.
NOTE 11 Not bank-specific; requires that all banks are idle and no bursts are in progress. However, as of the publication date of this standard, no statements spcification an assurance or refusal to license such patents or patent applications have been provided. NOTE 14 Read with auto precharge enabled or a Write with auto precharge enabled may be followed by any valid command to other banks provided that the timing restrictions described in the precharge and auto-precharge clarification table are followed.
This clarifies that dc-variations of VRef affect the absolute voltage a signal has to reach to achieve a valid high or low level and therefore the time to which setup and hold is measured. For data mask timing, see Figure 1.
A ZQ calibration command can only be issued when the device is in the idle state with all banks precharged. To accommodate drift rates and calculate the necessary interval between ZQCS commands, apply the following formula: Once tRP has been met, the bank will be jedeec the idle state.?
LOW POWER DOUBLE DATA RATE 3 SDRAM (LPDDR3) | JEDEC
The mask bit to the bank controls a refresh operation of entire memory within the bank. The bit CA bus contains command, address, and bank information. MRW commands can be issued at normal clock frequencies as long as all AC timings are met. The information included in JEDEC standards and publications represents a sound approach lpdr3 product specification and application, sspecification from the solid state device manufacturer viewpoint. Accesses begin with the registration of an Activate command, which is then followed by a Read or Write command.
NOTE 5 For reference: Calibration data will be output through DQ pins.
JEDEC 规范 LPDDR3_图文_百度文库
JEDEC standards and publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for use by those other than JEDEC members, whether the standard specificqtion to be used either domestically or internationally.
Each aspect of the specification was considered and approved by committee ballot s. DM1 is the input data mask signal for the data on DQ See Command Truth Table for command code descriptions. Not bank-specific reset command is achieved through Mode Register Write command. It is implied zero. A valid command may be issued only after tXSR is satisfied.
CA is considered part of the command code. Most significant, the supply voltage is reduced from 2. This specification was created using aspects of the following specifications: For behavior of the tolerance limits if temperature or voltage changes after calibration, see following section on voltage and temperature sensitivity.
Programming of bits in the reserved registers has no effect on the device operation. Allowable commands to the other banks are determined by its current state and Table 2, and according to Table 3.
NOTE 3 Terminated bursts are not allowed.