MT48H32M32LFB5-6 IT:B Micron, MT48H32M32LFB5-6 IT:B Datasheet - Page 72

• Manufacturer Part Number: MT48H32M32LFB5-6 IT:B
• Manufacturer: Micron

AUTO REFRESH Operation
PDF: 09005aef8404b23d
y68m_mobile_lpsdr.pdf – Rev. D 1/11 EN
The AUTO REFRESH command is used during normal operation of the device to refresh
the contents of the array. This command is nonpersistent, so it must be issued each
time a refresh is required. All active banks must be precharged prior to issuing an AUTO
REFRESH command. The AUTO REFRESH command should not be issued until the
minimum
the internal refresh controller. This makes the address bits “Don’t Care” during an AU-
TO REFRESH command.
After the AUTO REFRESH command is initiated, it must not be interrupted by any exe-
cutable command until
NOP commands must be issued on each positive edge of the clock. The SDRAM re-
quires that every row be refreshed each
FRESH command—calculated by dividing the refresh period (
rows to be refreshed—meets the timing requirement and ensures that each row is re-
freshed. Alternatively, to satisfy the refresh requirement a burst refresh can be employed
after every
ber of rows to be refreshed at the minimum cycle rate (
t
t
RP is met following the PRECHARGE command. Addressing is generated by
REF period by issuing consecutive AUTO REFRESH commands for the num-
t
RFC has been met. During
72
Micron Technology, Inc. reserves the right to change products or specifications without notice.
t
REF period. Providing a distributed AUTO RE-
1Gb: x32 Mobile LPSDR SDRAM
t
RFC time, COMMAND INHIBIT or
AUTO REFRESH Operation
t
RFC).
t
© 2010 Micron Technology, Inc. All rights reserved.
REF) by the number of