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參數(shù)資料
| 型號： | μPD4564323 |
| 廠商： | NEC Corp. |
| 英文描述： | 64M-bit Synchronous DRAM(64M 同步動態(tài)RAM) |
| 中文描述： | 6400位同步DRAM（6400同步動態(tài)RAM）的 |
| 文件頁數(shù)： | 19/82頁 |
| 文件大?。?/td> | 659K |
| 代理商： | ΜPD4564323 |
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19
μ
PD4564323
Preliminary Data Sheet
6. Programming the Mode Register
The mode register is programmed by the Mode register set command using address bits A10 through A0, BA0 and
BA1 as data inputs. The register retains data until it is reprogrammed or the device loses power.
The mode register has four fields;
Options
/CAS latency : A6 through A4
Wrap type
: A3
Burst length
: A2 through A0
: A10 through A7, BA0, BA1
Following mode register programming, no command can be issued before at least 2 CLK have elapsed.
/CAS Latency
/CAS latency is the most critical of the parameters being set. It tells the device how many clocks must elapse
before the data will be available.
The value is determined by the frequency of the clock and the speed grade of the device.
13.3 Relationship
between Frequency and Latency
shows the relationship of /CAS latency to the clock period and the speed grade of
the device.
Burst Length
Burst Length is the number of words that will be output or input in a read or write cycle. After a read burst is
completed, the output bus will become Hi-Z.
The burst length is programmable as 1, 2, 4, 8 or full page.
Wrap Type (Burst Sequence)
The wrap type specifies the order in which the burst data will be addressed. This order is programmable as either
“Sequential” or “Interleave”. The method chosen will depend on the type of CPU in the system.
Some microprocessor cache systems are optimized for sequential addressing and others for interleaved
addressing.
7.1 Burst Length and Sequence
shows the addressing sequence for each burst length using them.
Both sequences support bursts of 1, 2, 4 and 8. Additionally, sequence supports the full page length.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PD-45A | 功能描述:線性和開關(guān)式電源 40W 5V/3.2A 12V/2A RoHS:否 制造商:TDK-Lambda 產(chǎn)品:Switching Supplies 開放式框架/封閉式:Enclosed 輸出功率額定值:800 W 輸入電壓:85 VAC to 265 VAC 輸出端數(shù)量:1 輸出電壓（通道 1）:20 V 輸出電流（通道 1）:40 A 商用/醫(yī)用: 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:Rack 長度: 寬度: 高度: |
| PD-45B | 功能描述:線性和開關(guān)式電源 44.8W 5V/3.2A 24V/1.2A RoHS:否 制造商:TDK-Lambda 產(chǎn)品:Switching Supplies 開放式框架/封閉式:Enclosed 輸出功率額定值:800 W 輸入電壓:85 VAC to 265 VAC 輸出端數(shù)量:1 輸出電壓（通道 1）:20 V 輸出電流（通道 1）:40 A 商用/醫(yī)用: 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風(fēng)格:Rack 長度: 寬度: 高度: |
| PD45VN6C100 | 制造商:Banner Engineering 功能描述:SENSOR, PHOTOELECTRIC, PICODOT, CONVERGENT LASER, FOCAL POINT, 1 |
| PD45VN6C100Q | 制造商:Banner Engineering 功能描述:Sensor, PicoDot, Convergent Laser, Focal Point: 102mm, Input 10-30VDC, Cable 2m |
| PD45VN6C200 | 制造商:Banner Engineering 功能描述:PicoDot: Convergent Laser, Focal Point: 203 mm, Input: 10-30V dc, Outputs: Compl |
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