EM68932DVKB
EtronTech
Figure 14. Read Burst Showing CAS Latency
CK
CK
READ
NOP
NOP
NOP
NOP
NOP
Command
Address
BA, Col n
CL = 2
CL = 3
DQS
DQ
DO n
DQS
DQ
DO n
Don’t Care
(1) DO n = Data Out from column n
(2) BA, Col n = Bank A, Column n
(3) Burst Length = 4; 3 subsequent elements of Data Out appear in the programmed order following DO n
(4) Shown with nominal tAC, tDQSCK and tDQSQ
Figure 15. Consecutive Read Bursts
CK
CK
READ
NOP
READ
NOP
NOP
NOP
Command
Address
BA, Col n
BA, Col b
CL = 2
CL = 3
DQS
DQ
DO n
DO b
DQS
DQ
DO n
DO b
Don’t Care
(1) DO n (or b) = Data Out from column n (or column b)
(2) Burst Length = 4 or 8 (if 4, the bursts are concatenated; if 8 , the second burst interrupts the first)
(3) Read bursts are to an active row in any bank
(4) Shown with nominal tAC, tDQSCK and tDQSQ
Etron Confidential
25
Rev. 1.0
Aug. 2009
ETRON [ ETRON TECHNOLOGY, INC. ]
