W949D6CB Datasheet, PDF (17/60 Pages) Winbond – 512Mb Mobile LPDDR

W949D6CB / W949D2CB
6.7.1 SRR Register (A[n:0] = 0)
X
16 15 13 12 11 10
87
43
512Mb Mobile LPDDR
0 Rising Edge of DQ Bus
Reserved(0)
Refresh
Density DT DW _Rate
Revision Manufacturer
Identification Identification
SRR Register 0
DQ15 DQ14 DQ13 Density
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
0
128
1
256
0
512
1
1024
0
2048
1 Reserved
0 Reserved
1
64
DQ3 DQ2 DQ1 DQ0 Manufacturer
1
00 0
Winbond
DQ12 Device Type
0 ^LPDDR
1 ^Reserved
DQ11
0
1
Device
Width
16 bits
32 bits
DQ10 DQ9 DQ8
1
1
1
1
1
0
1
0
1
1
0
0
0
1
1
0
1
0
0
0
x
Refresh Rate
Reserved
0.25
Reserved
1
Reserved
Reserved
Reserved
DQ7:4 ^{Revision ID}
(See Note 1)
Note 1 : The manufacture’s revision number
starts at ‘0000’ and increments by ‘0001’ each
time a change in the manufacturer’s
specification(AC timings, or feature set), IBIS
(pull up or pull down characteristics), or
process occurs.
Note 2 : The refresh rate mulitiplier is based on the menory’s temperature sensor.
Note 3 : Required average periodic refresh interval = tREFI * multiplier
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Publication Release Date: Sep, 21, 2011
Revision A01-007