K4C561638C-TCD4000 Datasheet, PDF (42/42 Pages) Samsung semiconductor – 256Mb Network-DRAM

K4C5608/1638C
256Mb Network-DRAM
Functional Description (Continued)
Extended Mode Register Fields
(E-1) DLL Switch field (A0)
This bit is used to enable DLL. When the A0 bit is set "0", DLL is enabled.
(E-2) Output Driver Impedance Control field (A1/A0)
This field is used to choose Output Driver Strength. Four types of Driver Strength are supported.
A6
A1
Output Driver Impedance Control
0
0
Normal Output Driver
0
1
Strong Output Driver
1
0
Weaker Output Driver
1
1
Weakest Output Driver
(E-3) Reserved field (A2 to A5, A7 to A14)
These bits are reserved for future operations and must be set to "0" for normal operation.
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REV. 0.7 Aug. 2003