HY5DU28422ET Datasheet, PDF (22/35 Pages) Hynix Semiconductor – 128Mb DDR SDRAM

HY5DU28422ET
HY5DU28822ET
HY5DU281622ET
EXTENDED MODE REGISTER SET (EMRS)
The Extended Mode Register controls functions beyond those controlled by the Mode Register; these additional func-
tions include DLL enable/disable, output driver strength selection(optional). These functions are controlled via the bits
shown below. The Extended Mode Register is programmed via the Mode Register Set command (BA0=1 and BA1=0)
and will retain the stored information until it is programmed again or the device loses power.
The Extended Mode Register must be loaded when all banks are idle and no bursts are in progress, and the controller
must wait the specified time before initiating any subsequent operation. Violating either of these requirements will
result in unspecified operation.
BA1 BA0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
0
1
Operating Mode
0* DS DLL
BA0 MRS Type
0
MRS
1
EMRS
A0 DLL enable
0
Enable
1
Disable
A1
Output Driver
Impedance Control
0 Full Strength Driver
1 Half Strength Driver
An~A3
0
_
A2~A0
Valid
_
Operating Mode
Normal Operation
All other states reserved
* This part do not support/QFC function, A2 must be programmed to Zero.
Rev. 0.5 /Apr. 2006
22