W989D6DB Datasheet, PDF (25/64 Pages) Winbond – Standard Self Refresh Mode

W989D6DB / W989D2DB
8.6 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"
BA1 "1"
Extended
Mode
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: Mar. 19, 2014
Revision: A01-001