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512Mb: 32 Meg x 16, 16 Meg x 32 Mobile SDRAM
Truth Tables
Read with auto precharge enabled : Starts with registration of a READ command
with auto precharge enabled and ends when t RP has been met. After t RP is met, the
bank will be in the idle state.
Write with auto precharge enabled : Starts with registration of a WRITE command
with auto precharge enabled and ends when t RP has been met. After t RP is met, the
bank will be in the idle state.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
AUTO REFRESH, SELF REFRESH, and LOAD MODE REGISTER commands can only be is-
sued when all banks are idle.
A BURST TERMINATE command cannot be issued to another bank; it applies to the bank
represented by the current state only.
All states and sequences not shown are illegal or reserved.
READs or WRITEs to bank m listed in the Command/Action column include READs or
WRITEs with auto precharge enabled and READs or WRITEs with auto precharge disa-
bled.
Concurrent auto precharge: Bank n will initiate the auto precharge command when its
burst has been interrupted by bank m burst.
The burst in bank n continues as initiated.
For a READ without auto precharge interrupted by a READ (with or without auto pre-
charge), the READ to bank m will interrupt the READ on bank n , CAS latency (CL) later.
For a READ without auto precharge interrupted by a WRITE (with or without auto pre-
charge), the WRITE to bank m will interrupt the READ on bank n when registered. DQM
should be used one clock prior to the WRITE command to prevent bus contention.
For a WRITE without auto precharge interrupted by a READ (with or without auto pre-
charge), the READ to bank m will interrupt the WRITE on bank n when registered, with
the data-out appearing CL later. The last valid WRITE to bank n will be data-in regis-
tered one clock prior to the READ to bank m .
For a WRITE without auto precharge interrupted by a WRITE (with or without auto pre-
charge), the WRITE to bank m will interrupt the WRITE on bank n when registered. The
last valid WRITE to bank n will be data-in registered one clock prior to the READ to bank
m .
For a READ with auto precharge interrupted by a READ (with or without auto pre-
charge), the READ to bank m will interrupt the READ on bank n , CL later. The PRE-
CHARGE to bank n will begin when the READ to bank m is registered.
For a READ with auto precharge interrupted by a WRITE (with or without auto pre-
charge), the WRITE to bank m will interrupt the READ on bank n when registered. DQM
should be used two clocks prior to the WRITE command to prevent bus contention. The
PRECHARGE to bank n will begin when the WRITE to bank m is registered.
For a WRITE with auto precharge interrupted by a READ (with or without auto pre-
charge), the READ to bank m will interrupt the WRITE on bank n when registered, with
the data-out appearing CL later. The PRECHARGE to bank n will begin after t WR is met,
where t WR begins when the READ to bank m is registered. The last valid WRITE bank n
will be data-in registered one clock prior to the READ to bank m .
For a WRITE with auto precharge interrupted by a WRITE (with or without auto pre-
charge), the WRITE to bank m will interrupt the WRITE on bank n when registered. The
PRECHARGE to bank n will begin after t WR is met, where t WR begins when the WRITE
to bank m is registered. The last valid WRITE to bank n will be data registered one clock
to the WRITE to bank m .
PDF: 09005aef8459c827
512mb_mobile_sdram_y67m_at.pdf – Rev. B 3/11 EN
36
Micron Technology, Inc. reserves the right to change products or specifications without notice.
? 2011 Micron Technology, Inc. All rights reserved.
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