PreLIMINArY INforMAtIoN L9D125G80BG4
2.5 Gb, DDR - SDRAM Integrated Module (IMOD)
REGISTER DEFINITION
Ac t iv e
no oP e r a t io n (noP)
The ACTIVE command is used to open (or activate) a row in a particular
bank for a subsequent access. The value on the BA0, BA1 inputs selects
the bank and the address provided on inputs A0-A12, selects the row. This
row remains active (or opens) for accesses until a PRECHARGE command
is issued to that bank. A PRECHARGE command must be issued before
opening a different row in the same bank.
The NO OPERATION command is used to perform a NOP to the selected
DDR Silicon within the IMOD (CSx\=LOW). This prevents unwanted com-
mands from being registered during idle or wait states. Operations already
in progress are not affected.
Lo a D mo D e re g is t e r
The MODE REGISTER is loaded via inputs A0-A12. The LOAD MODE REG-
ISTER command can only be issued when all banks idle and a subsequent
t
executable command cannot be issued until MRD is met.
ac t iv a t in g a sP e c iF ic ro w in a sP e c iF ic Ba n k
CK#
CK
CKE HIGH
CS#
RAS#
CA S#
WE#
Address
Row
Bank
BA0, BA1
Don’t Care
LOGIC Devices Incorporated
www.logicdevices.com
High Performance, Integrated Memory Module Product
13
Feb 2, 2009 LDS-L9D125G80BG4-C
LOGIC [ LOGIC DEVICES INCORPORATED ]
