EtronTech

EM68932DVKB

Etron Confidential

25

Rev. 1.0

Aug. 2009

Figure 14. Read Burst Showing CAS Latency

CL = 2

Don’t Care

DO n

READ

NOP

NOP

NOP

NOP

NOP

BA, Col n

CL = 3

DO n

Command

Address

DQS

DQ

DQS

DQ

CK

CK

(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

CL = 2

Don’t Care

DO n

READ

NOP

READ

NOP

NOP

NOP

BA, Col n

BA, Col b

CL = 3

DO n

Command

Address

DQS

DQ

DQS

DQ

CK

CK

(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

DO b

DO b