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W949D6CB / W949D2CB
512Mb Mobile LPDDR
6.7.1 SRR Register (A[n:0] = 0)
X
16 15
13 12 11 10
8
7
4
3
0
Rising Edge of DQ Bus
Reserved(0)
Density DT DW
Refresh
Rate
Revision Manufacturer
Identification Identification
SRR Register 0
DQ15 DQ14 DQ13
Density
DQ3
DQ2
DQ1
DQ0
Manufacturer
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
128
256
512
1024
2048
Reserved
Reserved
64
1
0
0
0
Winbond
DQ12 Device Type
0
1
LPDDR
Reserved
DQ10
DQ9
DQ8
Refresh Rate
DQ7:4 Revision ID
DQ11
0
1
Device
Width
16 bits
32 bits
1
1
1
1
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
x
Reserved
0.25
Reserved
1
Reserved
Reserved
Reserved
(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
Publication Release Date: Sep, 21, 2011
- 17 -
Revision A01-007
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