W988D6FB_13 Datasheet, PDF (31/66 Pages) Winbond – 256Mb Mobile LPSDR

W988D6FB / W988D2FB
256Mb Mobile LPSDR
9.6 Extended Mode Register Description
The Extended Mode Register designates the operation condition while SDRAM is in Self Refresh Mode and selects
the output driver strength as full, 1/2, 1/4, or 1/8 strength. The register is divided into two fields; (1) Partial Array Self
Refresh field selects how much banks or which part of a bank need to be refreshed during Self Refresh. (2) Driver
Strength selected bit to control the size of output buffer. The initial value of the Extended Mode Register after power-
up is Full Driver Strength, and all banks are refreshed during Self Refresh Mode.
A0
A1
Partial Array
Self Refresh
A2
A3 "0"
A4 ^"0"
Reserved
A5
Output Driver
A6
A7 "0"
A8 "0"
A9 "0"
A10 "0"
Reserved
A11 "0"
A12 "0"
BA0 _"0" Extended
Mode
BA1 "1" Register Set
A2 A1 A0
000
001
010
011
100
101
110
111
Self-Refresh coverage
All banks
Banks 0 and 1 (BA1=0)
Bank 0 (BA1=BA0=0)
Reserved
Reserved
Reserved
Reserved
Reserved
A6 A5
00
01
10
11
Driver Strength
Full strength
1/2 strength
1/4 strength
1/8 strength
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Publication Release Date : August 15, 2013
Revision A01-004