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EPF8452A Datasheet(PDF) 9 Page - Altera Corporation

Part # EPF8452A
Description  Programmable Logic Device Family
Download  62 Pages
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Manufacturer  ALTERA [Altera Corporation]
Direct Link  http://www.altera.com
Logo ALTERA - Altera Corporation

EPF8452A Datasheet(HTML) 9 Page - Altera Corporation

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Altera Corporation
9
FLEX 8000 Programmable Logic Device Family Data Sheet
3
Figure 4. FLEX 8000 Carry Chain Operation
Cascade Chain
With the cascade chain, the FLEX 8000 architecture can implement
functions that have a very wide fan-in. Adjacent LUTs can be used to
compute portions of the function in parallel; the cascade chain serially
connects the intermediate values. The cascade chain can use a logical AND
or logical OR (via De Morgan’s inversion) to connect the outputs of
adjacent LEs. Each additional LE provides four more inputs to the
effective width of a function, with a delay as low as 0.6 ns per LE.
LU
a1
b1
Carry
s1
LE1
Register
a2
b2
Carry Chain
s2
LE2
Register
Carry Chain
s
n
LE
n
Register
a
n
b
n
Carry Chain
Carry-Out
LE
n + 1
Register
Carry-In
LUT
LUT
LUT


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