EM68B16DVAA
EtronTech
Figure 31. Interrupting Write to Precharge
CK
CK
WRITE
NOP
NOP
NOP
PRE
NOP
Command
Address
BA a
(or all)
BA, Col b
tWR
tDQSS max
*2
DQS
DQ
DI b
DM
*1
*1
*1
*1
Don’t Care
(1) DI b = Data In to column b.
(2) An interrupted burst of 4 or 8 is shown, 2 data elements are written.
(3) tWTR is referenced from the positive clock edge after the last desired Data in pair.
(4) A10 is LOW with the WRITE command (Auto Precharge is disabled)
(5) *1 = can be Don’t Care for programmed burst length of 4
(6) *2 = for programmed burst length of 4, DQS becomes Don’t Care at this point
Figure 32. Precharge Command
CK
CK
(High)
CKE
CS
RAS
CAS
WE
A0-A9
A11,A12
All Banks
A10
One Bank
BA
BA0,1
Don’t Care
BA = Bank Address
(if A10 = L, otherwise Don’t Care)
Etron Confidential
36
Rev. 1.0
Mar. 2009
ETRON [ ETRON TECHNOLOGY, INC. ]
