64Mbit – Enhanced SDRAM
8Mx8, 4Mx16 ESDRAM
Preliminary Datasheet
Commands
Command Summary Table
Function
CKE
Previous
Cycle
Current
Cycle
CS#
RAS#
CAS#
WE#
DQM
BA1,
BA0
A10/
AP
A11,
A9
A8-A0*
Mode Register Set
Extended Mode Register Set
No Operation (NOP)
Bank Activate
Write with Auto-Precharge
Write
Read with Auto-Precharge
Read
Burst Termination
Single Bank Precharge
Precharge All Banks
Auto-Refresh (CBR)
Self Refresh Entry
Self Refresh Exit
Device Deselect (DESEL)
Clock Suspend Mode Entry
Clock Suspend Mode Exit
Power Down Mode Entry
Power Down Mode Exit
Data Write/Output Enable
Data Mask/ Output Disable
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
L
H
L
H
H
X
X
X
X
X
X
X
X
X
X
X
H
L
H
X
L
H
L
H
X
X
L
L
L
L
L
L
L
L
L
L
L
L
L
H
X
X
L
L
H
L
H
H
H
H
H
L
L
L
L
X
X
X
L
L
H
H
L
L
L
L
H
H
H
L
L
X
X
X
L
L
H
H
L
L
H
H
L
L
L
H
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Op Code (BA1=0, BA0=0)
Op Code (BA1=1, BA0=0)
X
BS
BS
BS
BS
BS
X
BS
X
X
X
X
X
X
X
X
X
X
X
H
L
H
L
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Column
Column
Column
Column
X
X
X
X
X
X
X
X
X
X
X
X
X
Row Address
NOP or DESEL
NOP or DESEL
NOP or DESEL
X
X
X
X
X
X
X
X
L
H
* The 4Mx16 does not use A8 for column addresses.
This is a product in sampling or pre-production phase of development. Charac-
teristic data and other specifications are subject to change without notice.
Enhanced Memory Systems Inc., 1850 Ramtron Dr., Colo Spgs, CO 80921
PHONE: (800) 545-DRAM; FAX: (719) 488-9095;
http://www.edram.com
Page 6 of 33
Revision 1.1
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
