參數(shù)資料
型號(hào): EPF8452A
廠商: Altera Corporation
英文描述: PROGRAMMABLE LOGIC DEVICES FAMILY
中文描述: 系列可編程邏輯元件
文件頁數(shù): 9/61頁
文件大?。?/td> 979K
代理商: EPF8452A
Altera Corporation
9
FLEX 8000 Programmable Logic Device Family Data Sheet
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
LE
Register
a2
b2
Carry Chain
s2
LE
Register
Carry Chain
sn
LE
Register
an
bn
Carry Chain
Carry-Out
LEn + 1
Register
Carry-In
LUT
LUT
LUT
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