MT47H32M16HR-25E AIT:G Micron, MT47H32M16HR-25E AIT:G Datasheet - Page 99

• Manufacturer Part Number: MT47H32M16HR-25E AIT:G
• Description: DRAM Chip DDR2 SDRAM 512M-Bit 32Mx16 1.8V 84-Pin FBGA
• Manufacturer: Micron

Figure 54: Data Output Timing –
WRITE
PDF: 09005aef8440dbbc
512mbddr2_ait_aat.pdf – Rev. C 7/11 EN
LDQS#/LDQS/UDQ#/UDQS 3
All DQs collectively 4
DQ (first data valid)
DQ (last data valid)
DQS#/DQS or
Notes:
CK#
CK
WRITE bursts are initiated with a WRITE command. DDR2 SDRAM uses WL equal to RL
minus one clock cycle (WL = RL - 1CK) (see READ (page 71)). The starting column and
bank addresses are provided with the WRITE command, and auto precharge is either
enabled or disabled for that access. If auto precharge is enabled, the row being accessed
is precharged at the completion of the burst.
Note:
For the WRITE commands used in the following illustrations, auto precharge is disa-
bled.
During WRITE bursts, the first valid data-in element will be registered on the first rising
edge of DQS following the WRITE command, and subsequent data elements will be reg-
istered on successive edges of DQS. The LOW state on DQS between the WRITE com-
mand and the first rising edge is known as the write preamble; the LOW state on DQS
following the last data-in element is known as the write postamble.
The time between the WRITE command and the first rising DQS edge is WL ±
Subsequent DQS positive rising edges are timed, relative to the associated clock edge, as
T0 1
5.
6. The data valid window is derived for each DQS transition and is
7. DQ8, DQ9, DQ10, D11, DQ12, DQ13, DQ14, or DQ15.
1. READ command with CL = 3, AL = 0 issued at T0.
2.
3. DQ transitioning after DQS transitions define
4. All DQ must transition by
5.
6.
7.
8. I/O balls, when entering or exiting High-Z, are not referenced to a specific voltage level,
t
t
DQS skew.
t
skew.
t
t
but to when the device begins to drive or no longer drives, respectively.
QH is derived from
DQSCK is the DQS output window relative to CK and is the long-term component of
AC is the DQ output window relative to CK and is the “long term” component of DQ
LZ (MIN) and
HZ (MAX) and
t
AC and
Micron Confidential and Proprietary
T1
t LZ (MIN)
t
AC (MIN) are the first valid signal transitions.
t
t
AC (MAX) are the latest valid signal transitions.
DQSCK
T2
t
HP:
t LZ (MIN)
t RPRE
t
QH =
99
t
DQSQ after DQS transitions, regardless of
512Mb: x8, x16 Automotive DDR2 SDRAM
T3
t DQSCK 2 (MIN)
t
HP -
T3
T3
T3
T3n
t
Micron Technology, Inc. reserves the right to change products or specifications without notice.
QHS.
t AC 5 (MIN)
T3n
T3n
T3n
T4
T4
T4
T4
t
DQSQ window.
T4n
T4n
T4n
t AC 5 (MAX)
T4n
T5
T5
t DQSCK 2 (MAX)
T5
T5
T5n
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T5n
T5n
T5n
t
QH -
T6
t HZ (MAX)
T6
T6
T6
t HZ (MAX)
t
AC.
t
T6n
DQSQ.
t RPST
T6n
T6n
T6n
T7
t
DQSS.
WRITE