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CLK14_6N 参数 Datasheet PDF下载

CLK14_6N图片预览
型号: CLK14_6N
PDF下载: 下载PDF文件 查看货源
内容描述: 的Cyclone III器件手册 [Cyclone III Device Handbook]
分类和应用:
文件页数/大小: 274 页 / 7302 K
品牌: ALTERA [ ALTERA CORPORATION ]
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Chapter 2: Logic Elements and Logic Array Blocks in the Cyclone III Device Family  
2–3  
LE Operating Modes  
In addition to the three general routing outputs, LEs in a LAB have register chain  
outputs, which allows registers in the same LAB to cascade together. The register  
chain output allows the LUTs to be used for combinational functions and the registers  
to be used for an unrelated shift register implementation. These resources speed up  
connections between LABs while saving local interconnect resources.  
LE Operating Modes  
Cyclone III device family LEs operate in the following modes:  
Normal mode  
Arithmetic mode  
LE operating modes use LE resources differently. In each mode, there are six available  
inputs to the LE. These inputs include the four data inputs from the LAB local  
interconnect, the LE carry-in from the previous LE carry-chain, and the register chain  
connection. Each input is directed to different destinations to implement the desired  
logic function. LAB-wide signals provide clock, asynchronous clear, synchronous  
clear, synchronous load, and clock enable control for the register. These LAB-wide  
signals are available in all LE modes.  
The Quartus® II software automatically chooses the appropriate mode for common  
functions, such as counters, adders, subtractors, and arithmetic functions, in  
conjunction with parameterized functions such as the library of parameterized  
modules (LPM) functions. You can also create special-purpose functions that specify  
which LE operating mode to use for optimal performance, if required.  
Normal Mode  
Normal mode is suitable for general logic applications and combinational functions.  
In normal mode, four data inputs from the LAB local interconnect are inputs to a  
four-input LUT (Figure 2–2). The Quartus II Compiler automatically selects the  
carry-in (cin) or the data3signal as one of the inputs to the LUT. LEs in normal mode  
support packed registers and register feedback.  
Figure 2–2 shows LEs in normal mode.  
Figure 2–2. Cyclone III Device Family LEs in Normal Mode  
Register Chain  
Connection  
sload  
sclear  
(LAB Wide) (LAB Wide)  
Packed Register Input  
Row, Column, and  
Direct Link Routing  
Q
D
data1  
data2  
Row, Column, and  
Direct Link Routing  
ENA  
data3  
cin (from cout  
of previous LE)  
CLRN  
Four-Input  
LUT  
clock (LAB Wide)  
ena (LAB Wide)  
aclr (LAB Wide)  
Local Routing  
data4  
Register  
Chain Output  
Register Bypass  
Register Feedback  
December 2011 Altera Corporation  
Cyclone III Device Handbook  
Volume 1  
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