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2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
REFRESH Command
Figure 55: Nonsupported Transition from Repetitive REFRESH Burst
t REFI
t REFI
0ms
32ms
t REFW
64ms
= 32ms 2
96ms
Insufficient REFRESH commands
in this refresh window!
t REFBW
t REFBW
Notes:
1. Shown with subsequent REFRESH pause to regular distributed refresh pattern.
2. There are only ≈ 2048 REFRESH commands in the indicated t REFW window. This does not
provide the required minimum number of REFRESH commands (R).
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
79
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2010 Micron Technology, Inc. All rights reserved.
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