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2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
REFRESH Command
Figure 53: Regular Distributed Refresh Pattern
t REFI
t REFI
0ms
t REFBW
t REFBW
32ms
64ms
96ms
Notes:
1. Compared to repetitive burst REFRESH with subsequent REFRESH pause.
2. As an example, in a 1Gb LPDDR2 device at T C ≤ 85?C, the distributed refresh pattern has
one REFRESH command per 7.8 μ s; the burst refresh pattern has one REFRESH command
per 0.52 μ s, followed by ≈ 30ms without any REFRESH command.
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
77
Micron Technology, Inc. reserves the right to change products or specifications without notice.
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