HYB18T512160AC-37 INFINEON [Infineon Technologies AG], HYB18T512160AC-37 Datasheet - Page 55

• Manufacturer Part Number: HYB18T512160AC-37
• Description: 512-Mbit Double-Data-Rate-Two SDRAM
• Manufacturer: INFINEON [Infineon Technologies AG]

2.8.2
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 (
MRS register, as long as
undergoing Auto-Precharge from the completion of the
write burst may be reactivated if the following two
conditions are satisfied.
Figure 50
Figure 51
Data Sheet
C M D
C K , C K
D Q
C M D
D Q S ,
D Q S
D Q S ,
D Q S
C K , C K
D Q
A10 ="high"
W R IT E w /A P
P o s te d C A S
A10 ="high"
T0
Write with Auto-Precharge
Write with Auto-Precharge Example 1 (
Write with Auto-Precharge Example 2 (WR +
T0
W R IT E
w /A P
WL = RL-1 = 4
WL = RL-1 = 2
T1
T3
N O P
N O P
t
RAS
t
WR
), programmed in the
is satisfied. The bank
DIN A0 DIN A1 DIN A2 DIN A3
DIN A0 DIN A1 DIN A2 DIN A3
T2
T4
N O P
N O P
T3
T5
N O P
N O P
Completion of the Burst Write
Completion of the Burst Write
t
55
RC
T6
T4
N O P
N O P
1. The last data-in to bank activate delay time (
2. The RAS cycle time (
In DDR2 SDRAM’s the write recovery time delay (
has to be programmed into the MRS mode register. As
long as the analog
WR can be programmed between 2 and 6 clock cycles.
Minimum Write to Activate command spacing to the
same bank = WL + BL/2 +
Limit): WL = 2,
t
512-Mbit Double-Data-Rate-Two SDRAM
RP
WR +
activation has been satisfied.
>=tRASmin.
HYB18T512[400/800/160]A[C/F]–[3.7/5]
Limit): WL = 4,
tRCmin.
T5
T7
N O P
t
>=tRAS
N O P
RP
>=tRC
) has been satisfied.
tDAL
WR
WR
A u to -P re ch a rg e B e g in s
t
DAL
tDAL
t
WR
T8
A u to -P re ch a rg e B e g in s
T6
N O P
= 6 (WR = 3,
N O P
t
timing parameter is not violated,
DAL
t
RC
= 6 (WR = 3,
t
DAL
) from the previous bank
Functional Description
T9
.
T7
N O P
09112003-SDM9-IQ3P
N O P
tRP
tRP
t
RP
Rev. 1.13, 2004-05
= 3), BL = 4
t
BW-AP423
RP
B a n k A
A ctiva te
BW-AP223
B a n k A
A ctiva te
T12
= 3), BL = 4
t
DAL
t
WR
=
)