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W949D6CB / W949D2CB
512Mb Mobile LPDDR
7.7.1 Precharge Command
CK
CK
CKE
(High)
CS
RAS
CAS
WE
Address
All Banks
A10
One Bank
BA0,BA1
BA
= Don't Care
BA=BANK Address
(if A10 = L,otherwise Don't Care)
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 (t RP ) 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 (t REFI ), 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 t REFI.
Publication Release Date: Sep, 21, 2011
- 40 -
Revision A01-007
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