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512Mb: 32 Meg x 16, 16 Meg x 32 Mobile SDRAM
Commands
COMMAND INHIBIT
The COMMAND INHIBIT function prevents new commands from being executed by
the device, regardless of whether the CLK signal is enabled. The device is effectively de-
selected. Operations already in progress are not affected.
NO OPERATION (NOP)
The NO OPERATION (NOP) command is used to perform a NOP to the selected device
(CS# is LOW). This prevents unwanted commands from being registered during idle or
wait states. Operations already in progress are not affected.
LOAD MODE REGISTER (LMR)
The mode registers are loaded via inputs A[ n:0] (where A n is the most significant ad-
dress term), BA0, and BA1(see Mode Register (page 40)). The LOAD MODE REGISTER
command can only be issued when all banks are idle and a subsequent executable com-
mand cannot be issued until t MRD is met.
ACTIVE
The ACTIVE command is used to activate a row in a particular bank for a subsequent
access. The value on the BA0, BA1 inputs selects the bank, and the address provided se-
lects the row. This row remains active for accesses until a PRECHARGE command is is-
sued to that bank. A PRECHARGE command must be issued before opening a different
row in the same bank.
Figure 8: ACTIVE Command
CLK
CKE
CS#
RAS#
CAS#
WE#
Address
BA0, BA1
HIGH
Row address
Bank address
Don’t Care
PDF: 09005aef8459c827
512mb_mobile_sdram_y67m_at.pdf – Rev. B 3/11 EN
28
Micron Technology, Inc. reserves the right to change products or specifications without notice.
? 2011 Micron Technology, Inc. All rights reserved.
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