AS4C64M8D2 datasheet(39/59 Pages) ALSC

39 / 59 page

AS4C64M8D2

Confidential

Rev. 1.0

Feb. /2014

Figure 19. Burst read operation: RL=5 (AL=2, CL=3, BL=4)

CK#

DQs

CMD

DQS

Posted CAS#

READ A

NOP

=< tDQSCK

Dout A0 Dout A1 Dout A2 Dout A3

AL=2

CL=3

RL=5

DQS#

Figure 20. Burst read operation: RL=3 (AL=0, CL=3, BL=8)

CK#

DQs

CMD

DQS

READ A

NOP

Dout A0 Dout A1 Dout A2 Dout A3

CL=3

RL=3

DQS#

=< tDQSCK

Dout A4 Dout A5 Dout A6 Dout A7

Figure 21. Burst read followed by burst write: RL=5, WL= (RL-1) =4, BL=4

CK#

DQs

CMD

DQS

Tn-1

Tn+1

Tn+2

Tn+3

Tn+4

Tn+5

Post CAS#

READ A

NOP

Post CAS#

WRITE A

NOP

Dout A0

RL=5

DQS#

tRTW (Read to Write turn around time)

WL = RL-1 = 4

Dout A1

Dout A2

Dout A3

Din A0

Din A1

Din A2

Din A3

NOTE : The minimum time from the burst read command to the burst write command is defined by a read-to-write-

turn-around-time, which is 4 clocks in case of BL = 4 operation, 6 clocks in case of BL = 8 operation.

AS4C64M8D2 데이터시트(PDF) 39 Page - Alliance Semiconductor Corporation

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