MT42L256M32D4KP-3 IT:A【PDF 77/164 页】IC LPDDR2 SDRAM 8GBIT 168FBGA

2Gb: x16, x32 Mobile LPDDR2 SDRAM S4

REFRESH Command

Figure 53: Regular Distributed Refresh Pattern

t REFI

0ms

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

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