HY5PS1G421LM HYNIX [Hynix Semiconductor], HY5PS1G421LM Datasheet - Page 39

• Manufacturer Part Number: HY5PS1G421LM
• Description: 1Gb DDR2 SDRAM(DDP)
• Manufacturer: HYNIX [Hynix Semiconductor]

Rev. 0.2 / Oct. 2005
Example 1: Burst Read Operation Followed by Precharge:
RL = 4, AL = 1, CL = 3, BL = 4, t
Example 2: Burst Read Operation Followed by Precharge:
RL = 4, AL = 1, CL = 3, BL = 8, t
CK/CK
CMD
DQS/DQS
DQ’s
CK/CK
CMD
DQS/DQS
DQ’s
Post CAS
Post CAS
first 4-bit prefetch
READ A
READ A
T0
T0
AL = 1
AL = 1
T1
T1
NOP
AL + BL/2 clks
NOP
AL + BL/2 clks
second 4-bit prefetch
T2
T2
RL =4
RL =4
NOP
> = t
NOP
> = t
RTP
RAS
CL = 3
CL = 3
RTP
RTP
Precharge
T3
T3
NOP
<= 2 clocks
<= 2 clocks
T4
T4
NOP
NOP
> = t
DOUT A
DOUT A
RTP
0
0
DOUT A
DOUT A
Precharge A
> = t
CL =3
1
1
T5
T5
NOP
RP
DOUT A
DOUT A
2
2
DOUT A
DOUT A
3
3
T6
T6
NOP
NOP
DOUT A
1HY5PS12421(L)M
4
HY5PS12821(L)M
DOUT A
Bank A
Active
5
T7
T7
NOP
DOUT A
6
DOUT A
7
T 8
T 8
NOP
NOP
39