K4N56163QF Datasheet, PDF (54/73 Pages) Samsung semiconductor – 256Mbit gDDR2 SDRAM

K4N56163QF-GC
Example 1: Burst Read Operation with Auto Precharge:
RL = 4, AL = 1, CL = 3, BL = 8, t_RTP <= 2 clocks
T0
T1
T2
T3
T4
T5
CK/CK
256M gDDR2 SDRAM
T6
T7
T8
CMD
Post CAS
READ A
Autoprecharge
DQS
NOP
NOP
AL + BL/2 clks
NOP
DQ’s
AL = 1
CL = 3
RL =4
first 4-bit prefetch
second 4-bit prefetch
NOP
NOP
NOP
NOP
> = t_RP
Bank A
Activate
DOUT A₀ DOUT A₁ DOUT A₂ DOUT A₃ DOUT A₄ DOUT A₅ DOUT A₆ DOUT A₈
> = t_RTP
t_RTP
Precharge begins here
Example 2: Burst Read Operation with Auto Precharge:
RL = 4, AL = 1, CL = 3, BL = 4, t_RTP > 2 clocks
T0
T1
T2
T3
T4
T5
T6
T7
T8
CK/CK
CMD ^{Post CAS}
READ A
Autoprecharge
NOP
NOP
> = AL + tRTP + tRP
DQS
NOP
DQ’s
AL = 1
CL = 3
RL =4
NOP
NOP
NOP
Bank A
Activate
NOP
DOUT A₀ DOUT A₁ DOUT A₂ DOUT A₃
4-bit prefetch
t_RTP
Precharge begins here
t_RP
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Rev 1.6 (Apr. 2005)