eorex
EM488M3244LBA
Extended Mode Register Set ( EMRS )
The Extended mode register is written by asserting low on /CS, /RAS, /CAS, /WE and high on BA1 ( The
SDRAM should be in all bank precharge with CKE already prior to writing into the extended mode register. )
The state of address pins A0-A10 and BA1 in the same cycle as /CS, /RAS, /CAS, and /WE going low is
written in the extended mode register. The mode register contents can be changed using the same
command and clock cycle requirements during operation as long as all banks are in the idle state.
BA1 BA0 A11/A10
A9
0
A8
0
A7
0
A6
0
A5
A4
0
A3
0
A2
A1
A0
1
0
0
DS
0
Driver Strength
1/2 Strength
1/4 Strength
A5
0
1
BA1
MRS
0
1
Normal
EMRS
Output Drive Strength
The normal drive strength got all outputs is specified to be LV-CMOS. By setting EMRS specific parameter
on only A5 , driving capability of data output drivers is selected. It’s different with other mobile SDRAM DS
setting( other mobile use A6/A5 ).
Jul. 2006
www.eorex.com
12/19
EOREX [ EOREX CORPORATION ]
