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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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W947D6HBHX6E-TR Fiches technique(PDF) 40 Page - Winbond |
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W947D6HBHX6E-TR Fiches technique(HTML) 40 Page - Winbond |
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40 / 60 page  W947D6HB / W947D2HB 128Mb Mobile LPDDR Publication Release Date:Jun,17, 2011 - 40 - Revision A01-003 7.7.1 Precharge Command = Don't Care (High) CK CK CKE CS RAS CAS WE Address BA=BANK Address (if A10 = L,otherwise Don't Care) BA BA0,BA1 A10 All Banks One Bank 7.8 Auto Precharge Auto Precharge is a feature which performs the same individual bank precharge function as described above, but without requiring an explicit command. This is accomplished by using A10 (A10 = High), to enable Auto Precharge in conjunction with a specific READ or WRITE command. A precharge of the bank / row that is addressed with the READ or WRITE command is automatically performed upon completion of the read or write burst. Auto Precharge is non persistent in that it is either enabled or disabled for each individual READ or WRITE command. Auto Precharge ensures that a precharge is initiated at the earliest valid stage within a burst. The user must not issue another command to the same bank until the precharing time (tRP) is completed. This is determined as if an explicit PRECHARGE command was issued at the earliest possible time, as described for each burst type in the Operation section of this specification. 7.9 Refresh Requirements LPDDR SDRAM devices require a refresh of all rows in any rolling 64ms interval. Each refresh is generated in one of two ways: by an explicit AUTO REFRESH command, or by an internally timed event in SELF REFRESH mode. Dividing the number of device rows into the rolling 64ms interval defines the average refresh interval (tREFI), which is a guideline to controllers for distributed refresh timing. 7.10 Auto Refresh AUTO REFRESH command is used during normal operation of the LPDDR SDRAM. This command is non persistent, so it must be issued each time a refresh is required. The refresh addressing is generated by the internal refresh controller. The LPDDR SDRAM requires AUTO REFRESH commands at an average periodic interval of tREFI. |
Numéro de pièce similaire - W947D6HBHX6E-TR |
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Description similaire - W947D6HBHX6E-TR |
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