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參數(shù)資料
| 型號(hào)： | FM3808 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | DRAM |
| 英文描述： | 4Kb FRAM Serial 3V Memory |
| 中文描述： | 4Kb的鐵電串行3V的記憶 |
| 文件頁(yè)數(shù)： | 17/28頁(yè) |
| 文件大?。?/td> | 191K |
| 代理商： | FM3808 |
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FM3808
Rev 1.1
May 2003
Page 17 of 28
FRAM Design Considerations
SRAM and FRAM alike begin each read/write cycle
with a new address being driven prior to the chip
enable transition low. The falling edge of chip enable
latches the address and a memory access starts. For
subsequent memory accesses, SRAMs allow /CE to
remain low while the address bus changes. FRAM
devices do not allow this signalling. Every FRAM
access requires a falling edge of /CE, therefore users
cannot ground this pin as you might with SRAM.
Users who are modifying existing designs to use
FRAM should examine the memory controller for
timing compatibility of address and control pins.
Each memory access must be qualified with a low
transition of /CE. In many cases, this is the only
change required. An example of the signal
relationships is shown in Figure 8 below. Also shown
is a common SRAM signal relationship that will not
work for the FRAM devices.
The reason for /CE to strobe for each address is two-
fold: it latches the new address and creates the
necessary precharge period while /CE is high.
Address 1
Address 2
Data 1
Data 2
Valid Memory Signaling Relationship
CE
Address
Data
FRAM
signaling
Address 2
Data 1
CE
Address
Data
SRAM
signaling
Invalid Memory Signaling Relationship
Address 1
Data 2
Figure 8. Memory Address and /CE Relationships
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FM3808-70-T | 4Kb FRAM Serial 3V Memory |
| FM3808DK | 4Kb FRAM Serial 3V Memory |
| FMA10A | General Purpose(Dual Digital Transistor)(通用(雙數(shù)字晶體管)) |
| FMA11A | Emitter Common (Dual Digital Transistors)(公共發(fā)射級(jí)(雙數(shù)字晶體管)) |
| FMA1 | General purpose (dual digital transistors) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FM3808_06 | 制造商:RAMTRON 制造商全稱:RAMTRON 功能描述:256Kb Bytewide FRAM w/ Real-Time Clock |
| FM3808-70-T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:256Kb Bytewide FRAM w/ Real-Time Clock |
| FM3808DK | 制造商:RAMTRON 制造商全稱:RAMTRON 功能描述:256Kb Bytewide FRAM w/ Real-Time Clock |
| FM3808-S | 制造商:Ramtron International Corporation 功能描述:FRAM RTC 256K SMD 3808 TSOP32 |
| FM3808-SG | 制造商:Ramtron International Corporation 功能描述:FRAM RTC 256K SMD 3808 TSOP32 |
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