參數(shù)資料
型號: MT48H8M16LFB4-8IT:JTR
元件分類: DRAM
英文描述: 8M X 16 SYNCHRONOUS DRAM, 6 ns, PBGA54
封裝: 8 X 8 MM, LEAD FREE, VFBGA-54
文件頁數(shù): 19/61頁
文件大?。?/td> 2469K
PDF: 09005aef8237e877/Source: 09005aef8237e8d8
Micron Technology, Inc., reserves the right to change products or specifications without notice.
128Mb_x16 Mobile SDRAM_Y25M_2.fm - Rev. A 6/06 EN
26
2006 Micron Technology, Inc. All rights reserved.
128Mb: x16 Mobile SDRAM
READs
Preliminary
WRITE command. Full-speed random write accesses within a page can be performed to
the same bank, as shown in Figure 19, or each subsequent WRITE may be performed to a
different bank.
Figure 17:
WRITE Burst
Notes:
1. BL = 2. DQM is LOW.
Figure 18:
WRITE-To-WRITE
Notes:
1. DQM is LOW. Each WRITE command may be to any bank.
Data for any WRITE burst may be truncated with a subsequent READ command, and
data for a fixed-length WRITE burst may be immediately followed by a READ command.
Once the READ command is registered, the data inputs will be ignored, and WRITEs will
not be executed. An example is shown in Figure 20 on page 27. Data n + 1 is either the
last of a burst of two or the last desired of a longer burst.
Data for a fixed-length WRITE burst may be followed by, or truncated with, a
PRECHARGE command to the same bank (provided that auto precharge was not acti-
vated). The PRECHARGE command should be issued tWR after the clock edge at which
the last desired input data element is registered. The auto precharge mode requires a
tWR of at least one clock plus time, regardless of frequency.
In addition, when truncating a WRITE burst, the DQM signal must be used to mask
input data for the clock edge prior to, and the clock edge coincident with, the
PRECHARGE command. An example is shown in Figure 21 on page 28. Data n + 1 is
either the last of a burst of two or the last desired of a longer burst. Following the
PRECHARGE command, a subsequent command to the same bank cannot be issued
until tRP is met.
CLK
DQ
DIN
n
T2
T1
T3
T0
COMMAND
ADDRESS
NOP
DON’T CARE
WRITE
DIN
n + 1
NOP
BANK,
COL n
TRANSITIONING DATA
CLK
DQ
T2
T1
T0
COMMAND
ADDRESS
NOP
WRITE
BANK,
COL n
BANK,
COL b
DIN
n
DIN
n + 1
DIN
b
DON’T CARE
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相關代理商/技術參數(shù)
參數(shù)描述
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