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参数资料
| 型号： | MT46H16M32LFB5-6IT:C |
| 元件分类： | DRAM |
| 英文描述： | 16M X 32 DDR DRAM, PBGA90 |
| 封装： | 13 X 8 MM, GREEN, PLASTIC, VFBGA-90 |
| 文件页数： | 68/95页 |
| 文件大小： | 3228K |
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WRITE Operation
WRITE bursts are initiated with a WRITE command, as shown in Figure 11 (page 38).
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 ena-
bled, the row being accessed is precharged at the completion of the burst. For the
WRITE commands used in the following illustrations, auto precharge is disabled. Basic
data input timing is shown in Figure 32 (page 71) (this timing applies to all WRITE
operations).
Input data appearing on the data bus is written to the memory array subject to the state
of data mask (DM) inputs coincident with the data. If DM is registered LOW, the corre-
sponding data will be written; if DM is registered HIGH, the corresponding data will be
ignored, and the write will not be executed to that byte/column location. DM operation
is illustrated in Figure 33 (page 72).
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 of DQS between the WRITE com-
mand and the first rising edge is known as the write preamble; the LOW state of DQS
following the last data-in element is known as the write postamble. The WRITE burst is
complete when the write postamble and tWR or tWTR are satisfied.
The time between the WRITE command and the first corresponding rising edge of DQS
(tDQSS) is specified with a relatively wide range (75%–125% of one clock cycle). All
WRITE diagrams show the nominal case. Where the two extreme cases (that is, tDQSS
completion of a burst, assuming no other commands have been initiated, the DQ will
remain High-Z and any additional input data will be ignored.
Data for any WRITE burst can be concatenated with or truncated by a subsequent
WRITE command. In either case, a continuous flow of input data can be maintained.
The new WRITE command can be issued on any positive edge of clock following the
previous WRITE command. The first data element from the new burst is applied after
either the last element of a completed burst or the last desired data element of a longer
burst that is being truncated. The new WRITE command should be issued x cycles after
the first WRITE command, where x equals the number of desired data element pairs
(pairs are required by the 2n-prefetch architecture).
Figure 35 (page 74) shows concatenated bursts of 4. An example of nonconsecutive
WRITEs is shown in Figure 36 (page 74). Full-speed random write accesses within a
page or pages can be performed, as shown in Figure 37 (page 75).
Data for any WRITE burst can be followed by a subsequent READ command. To follow
Data for any WRITE burst can be truncated by a subsequent READ command, as shown
in Figure 39 (page 77). Note that only the data-in pairs that are registered prior to the
tWTR period are written to the internal array, and any subsequent data-in should be
masked with DM, as shown in Figure 40 (page 78).
Data for any WRITE burst can be followed by a subsequent PRECHARGE command. To
follow a WRITE without truncating the WRITE burst, tWR should be met, as shown in
Micron Confidential and Proprietary
Advance
512Mb: x16, x32 Mobile LPDDR SDRAM
WRITE Operation
PDF: 09005aef83dd2b3e
t67m_512mb_mobile_lpddr.pdf - Rev. B 2/10 EN
70
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2009 Micron Technology, Inc. All rights reserved.
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