參數(shù)資料
型號: HYB18T512160AF-3
廠商: INFINEON TECHNOLOGIES AG
英文描述: 512-Mbit DDR2 SDRAM
中文描述: 512兆位DDR2 SDRAM的
文件頁數(shù): 65/117頁
文件大?。?/td> 2102K
代理商: HYB18T512160AF-3
Data Sheet
65
Rev. 1.3, 2005-01
09112003-SDM9-IQ3P
HYB18T512[40/80/16]0AF–[3/3S/3.7/5]
512-Mbit DDR2 SDRAM
Functional Description
3.23.2
Write with Auto-Precharge
If A10 is HIGH when a Write Command is issued, the
Write with Auto-Precharge function is engaged. The
DDR2 SDRAM automatically begins precharge
operation after the completion of the write burst plus the
write recovery time delay (WR), programmed in the
MRS register, as long as
t
RAS
is satisfied. The bank
undergoing Auto-Precharge from the completion of the
write burst may be reactivated if the following two
conditions are satisfied.
1. The last data-in to bank activate delay time (
t
DAL
=
WR +
t
RP
) has been satisfied.
2. The RAS cycle time (
t
RC
) from the previous bank
activation has been satisfied.
In DDR2 SDRAM’s the write recovery time delay (WR)
has to be programmed into the MRS mode register. As
long as the analog
t
WR
timing parameter is not violated,
WR can be programmed between 2 and 6 clock cycles.
Minimum Write to Activate command spacing to the
same bank = WL + BL/2 +
t
DAL
.
Figure 51
Write with Auto-Precharge Example 1 (
t
RC
Limit)
WL = 2,
t
DAL
= 6 (WR = 3,
t
RP
= 3), BL = 4
Figure 52
Write with Auto-Precharge Example 2 (WR +
t
RP
Limit)
WL = 4,
t
DAL
= 6 (WR = 3,
t
RP
= 3), BL = 4
NOP
NOP
NOP
NOP
NOP
Bank A
Activate
NOP
W RITE
w/AP
T0
T2
T1
T3
T4
T5
T6
T7
NOP
CMD
DQ
BW-AP223
A10 ="high"
tRP
Auto-Precharge Begins
DIN A0 DIN A1 DIN A2 DIN A3
WL = RL-1 = 2
WR
tRCmin.
>=tRASmin.
DQS,
DQS
Completion of the Burst Write
tDAL
CK, CK
NOP
NOP
NOP
NOP
NOP
Bank A
Activate
NOP
W RITE w/AP
Posted CAS
T0
T3
T4
T5
T6
T7
T12
NOP
CMD
DQ
BW-AP423
A10 ="high"
tRP
Auto-Precharge Begins
DIN A0 DIN A1 DIN A2 DIN A3
WL = RL-1 = 4
WR
>=tRC
T9
T8
Completion of the Burst Write
DQS,
DQS
tDAL
>=tRAS
CK, CK
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