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参数资料
| 型号： | HY5PS1G821LM-E3 |
| 厂商： | HYNIX SEMICONDUCTOR INC |
| 元件分类： | DRAM |
| 英文描述： | 1Gb DDR2 SDRAM(DDP) |
| 中文描述： | 128M X 8 DDR DRAM, 0.6 ns, PBGA63 |
| 封装： | FBGA-63 |
| 文件页数： | 33/79页 |
| 文件大小： | 1109K |
| 代理商： | HY5PS1G821LM-E3 |
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Rev. 0.2 / Oct. 2005
33
1
HY5PS12421(L)M
HY5PS12821(L)M
2.5.4 Burst Write Operation
The Burst Write command is initiated by having CS, CAS and WE low while holding RAS high at the rising
edge of the clock. The address inputs determine the starting column address. Write latency (WL) is defined
by a read latency (RL) minus one and is equal to (AL + CL -1). A data strobe signal (DQS) should be driven
low (preamble) one clock prior to the WL. The first data bit of the burst cycle must be applied to the DQ pins
at the first rising edge of the DQS following the preamble. The tDQSS specification must be satisfied for write
cycles. The subsequent burst bit data are issued on successive edges of the DQS until the burst length is
completed, which is 4 or 8 bit burst. When the burst has finished, any additional data supplied to the DQ pins
will be ignored. The DQ Signal is ignored after the burst write operation is complete. The time from the com-
pletion of the burst write to bank precharge is the write recovery time (WR).
DDR2 SDRAM pin timings are specified for either single ended mode or differential mode depending on the
setting of the EMRS “Enable DQS” mode bit; timing advantages of differential mode are realized in system
design. The method by which the DDR2 SDRAM pin timings are measured is mode dependent. In single
ended mode, timing relationships are measured relative to the rising or falling edges of DQS crossing at V
REF
.
In differential mode, these timing relationships are measured relative to the crosspoint of DQS and its com-
plement, DQS. This distinction in timing methods is guaranteed by design and characterization. Note that
when differential data strobe mode is disabled via the EMRS, the complementary pin, DQS, must be tied
externally to VSS through a 20 ohm to 10 Kohm resistor to insure proper operation.
Burst Write Operation: RL = 5, WL = 4, tWR = 3 (AL=2, CL=3), BL = 4
t
DS
t
DS
t
DH
t
WPRE
t
WPST
t
DQSH
t
DQSL
DQS
DQS
D
DMin
DQS/
DQS
DQ
DM
t
DH
Data input (write) timing
DMin
DMin
DMin
D
D
D
CMD
NOP
NOP
NOP
NOP
NOP
NOP
DQs
NOP
CK/CK
T0
T2
T1
T3
T4
T5
T6
T7
Tn
WRITE A
Posted CAS
WL = RL - 1 = 4
DQS/DQS
< = t
DQSS
> = WR
DIN A
0
DIN A
1
DIN A
2
DIN A
3
Precharge
Completion of
the Burst Write
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相关代理商/技术参数 |
参数描述 |
|---|---|
| HY5PS1G821M | 制造商:HYNIX 制造商全称:Hynix Semiconductor 功能描述:1Gb DDR2 SDRAM(DDP) |
| HY5PS1G821M-C4 | 制造商:HYNIX 制造商全称:Hynix Semiconductor 功能描述:1Gb DDR2 SDRAM(DDP) |
| HY5PS1G821M-E3 | 制造商:HYNIX 制造商全称:Hynix Semiconductor 功能描述:1Gb DDR2 SDRAM(DDP) |
| HY5PS1G831AFP | 制造商:HYNIX 制造商全称:Hynix Semiconductor 功能描述:1Gb DDR2 SDRAM |
| HY5PS1G831AFP-C4 | 制造商:HYNIX 制造商全称:Hynix Semiconductor 功能描述:1Gb DDR2 SDRAM |
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