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LFX1200B-3F900C датащи(PDF) 7 Page - Lattice Semiconductor

номер детали LFX1200B-3F900C
подробное описание детали  The ispXPGA architecture
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производитель  LATTICE [Lattice Semiconductor]
домашняя страница  http://www.latticesemi.com
Logo LATTICE - Lattice Semiconductor

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Lattice Semiconductor
ispXPGA Family Data Sheet
7
Figure 4. LUT in Shift Register Mode
Carry Chain Generator
The Carry Chain Generator is useful for implementing high-speed arithmetic functions. The CCG consists of a two-
input XOR gate whose carryout can be cascaded with the input of the adjacent CCG. As shown in Figure 5, the
carryin signal feeds CLE3 of the PFU and is propagated through CLE2 and CLE1 before reaching CLE0. The sum
output of the CCG can be fed to the CSE through the WLG. The carryout must propagate to CLE0 for use outside
the PFU. The carryout from the PFU can feed the W0 input of CSE0. The CCG also helps to effectively implement
wider functions by using its logic elements to expand the capabilities of the LUT-4.
Figure 5. Carry Chain Generator
Wide Logic Generator
The WLG contains the logic necessary to implement wide gate functions. This is made up of a set of multiplexers
that are located between the CLE and the CSE. The WLG helps in enhancing the wide gating capability of the PFU.
The outputs of each CLE can be cascaded in the WLG to build wide gating functions. Wide multiplexing functions
are also possible with a similar use of the WLG. Figure 6 illustrates the WLG.
LUT-4
PFUCLK0
SHIFTOUT (4A)
SEL (SHIFTIN)
CEB0
A
B
CIN
COUT
SUM
CLE3
CLE1
CLE2
CLE0
SUM3
COUT(r,c)
COUT to
CSE0
CIN from
Routing
COUT(r+1,c)
SUM2
SUM1
SUM0


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