參數(shù)資料
型號: EP1C6T240I8
廠商: Altera Corporation
英文描述: Cyclone FPGA Family
中文描述: 氣旋FPGA系列
文件頁數(shù): 16/94頁
文件大?。?/td> 1138K
代理商: EP1C6T240I8
16
Altera Corporation
Cyclone FPGA Family Data Sheet
Preliminary Information
Figure 8. Carry Select Chain
The Quartus II Compiler automatically creates carry chain logic during
design processing, or the designer can create it manually during design
entry. Parameterized functions such as LPM functions automatically take
advantage of carry chains for the appropriate functions.
The Quartus II Compiler creates carry chains longer than 10 LEs by
linking LABs together automatically. For enhanced fitting, a long carry
chain runs vertically allowing fast horizontal connections to M4K
memory blocks. A carry chain can continue as far as a full column.
LE4
LE3
LE2
LE1
A1
B1
A2
B2
A3
B3
A4
B4
Sum1
Sum2
Sum3
Sum4
LE10
LE9
LE8
LE7
A7
B7
A8
B8
A9
B9
A10
B10
Sum7
LE6
A6
B6
Sum6
LE5
A5
B5
Sum5
Sum8
Sum9
Sum10
0
1
0
1
LAB Carry-In
LAB Carry-Out
LUT
LUT
LUT
LUT
data1
data2
LAB Carry-In
Carry-In0
Carry-In1
Carry-Out0
Carry-Out1
Sum
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