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參數(shù)資料
| 型號： | MT48LC4M16A2P-75:G |
| 元件分類： | DRAM |
| 英文描述： | 4M X 16 SYNCHRONOUS DRAM, 5.4 ns, PDSO54 |
| 封裝： | 0.400 INCH, ROHS COMPLIANT, PLASTIC, TSOP2-54 |
| 文件頁數(shù)： | 19/72頁 |
| 文件大?。?/td> | 3455K |
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PDF: 09005aef80725c0b/Source: 09005aef806fc13c
Micron Technology, Inc., reserves the right to change products or specifications without notice.
64MSDRAM_2.fm - Rev. N 12/08 EN
26
2000 Micron Technology, Inc. All rights reserved.
64Mb: x4, x8, x16 SDRAM
Commands
Figure 13:
Random READ Accesses
Note:
Each READ command may be to any bank. DQM is LOW.
Data from any READ burst may be truncated with a subsequent WRITE command, and
data from a fixed-length READ burst may be immediately followed by data from a
WRITE command (subject to bus turnaround limitations). The WRITE burst may be
initiated on the clock edge immediately following the last (or last desired) data element
from the READ burst, provided that I/O contention can be avoided. In a given system
design, there may be a possibility that the device driving the input data will go Low-Z
before the SDRAM DQs go High-Z. In this case, at least a single-cycle delay should occur
between the last read data and the WRITE command.
The DQM input is used to avoid I/O contention, as shown in Figures 14 and 15 on
page 27. The DQM signal must be asserted (HIGH) at least two clocks prior to the WRITE
command (DQM latency is two clocks for output buffers) to suppress data-out from the
READ. Once the WRITE command is registered, the DQs will go High-Z (or remain
High-Z), regardless of the state of the DQM signal, provided the DQM was active on the
clock just prior to the WRITE command that truncated the READ command. If not, the
second WRITE will be an invalid WRITE. For example, if DQM was LOW during T4 in,
then the WRITEs at T5 and T7 would be valid, while the WRITE at T6 would be invalid.
CLK
DQ
T2
T1
T4
T3
T6
T5
T0
COMMAND
ADDRESS
READ
NOP
BANK,
COL n
DON’T CARE
DOUT
n
DOUT
a
DOUT
x
DOUT
m
READ
NOP
BANK,
COL a
BANK,
COL x
BANK,
COL m
CLK
DQ
DOUT
n
T2
T1
T4
T3
T5
T0
COMMAND
ADDRESS
READ
NOP
BANK,
COL n
DOUT
a
DOUT
x
DOUT
m
READ
NOP
BANK,
COL a
BANK,
COL x
BANK,
COL m
CAS Latency = 2
CAS Latency = 3
TRANSITIONING DATA
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT48LC4M16A2P75ITG | 制造商:Micron Technology Inc 功能描述: |
| MT48LC4M16A2P-75ITG | 制造商: 功能描述: |
| MT48LC4M16A2P-7E | 制造商:Micron Technology Inc 功能描述:SDRAM 64MBIT 133MHZ 54TSOP 制造商:Micron Technology Inc 功能描述:SDRAM, 64MBIT, 133MHZ, 54TSOP 制造商:Micron Technology Inc 功能描述:SDRAM, 64MBIT, 133MHZ, 54TSOP, Memory Type:DRAM - Synchronous, Memory Configurat |
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