HW-SPAR3E-SK-US-G Xilinx Inc, HW-SPAR3E-SK-US-G Datasheet - Page 26
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HW-SPAR3E-SK-US-G
Manufacturer Part Number
HW-SPAR3E-SK-US-G
Description
KIT STARTER SPARTAN-3E
Manufacturer
Xilinx Inc
Specifications of HW-SPAR3E-SK-US-G
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
122-1507
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Functional Description
ing LUTs or by using the wide function multiplexers that are
described later.
The output of the LUT can connect to the wide multiplexer
logic, the carry and arithmetic logic, or directly to a CLB out-
put or to the CLB storage element. See
Depending on the slice, FiMUX takes on the name F6MUX,
F7MUX, or F8MUX. The designation indicates the number
of inputs possible without restriction on the function. For
example, an F7MUX can generate any function of seven
inputs.
each position in the Spartan-3E CLB. The figure also
includes the direct connections within the CLB, along with
the F7MUX connection to the CLB below.
Each mux can create logic functions of more inputs than
indicated by its name. The F5MUX, for example, can gener-
26
G[4:1]
F[4:1]
Figure 20
4
4
Figure 18: LUT Resources in a Slice
A[4:1]
A[4:1]
shows the names of the multiplexers in
G-LUT
F-LUT
FXINA
FXINB
F[4:1]
G[4:1]
D
D
BY
BX
Figure 19: Dedicated Multiplexers in Spartan-3E CLB
LUT
LUT
Figure
FFY
FFX
DS312-2_33_111105
FiMUX
F5MUX
18.
1
0
1
0
www.xilinx.com
YQ
XQ
Y
X
D Q
D Q
Wide Multiplexers
For additional information, refer to the “Using Dedicated
Multiplexers” chapter in UG331.
Wide-function multiplexers effectively combine LUTs in
order to permit more complex logic operations. Each slice
has two of these multiplexers with F5MUX in the bottom por-
tion of the slice and FiMUX in the top portion. The F5MUX
multiplexes the two LUTs in a slice. The FiMUX multiplexes
two CLB inputs which connect directly to the F5MUX and
FiMUX results from the same slice or from other slices. See
Figure
ate any function of five inputs, with four inputs duplicated to
two LUTs and the fifth input controlling the mux. Because
each LUT can implement independent 2:1 muxes, the
F5MUX can combine them to create a 4:1 mux, which is a
six-input function. If the two LUTs have completely indepen-
dent sets of inputs, some functions of all nine inputs can be
implemented.
tiplexer and the number of inputs possible for different types
of functions.
19.
FX (Local Feedback to FXIN)
Y (General Interconnect)
YQ
F5 (Local Feedback to FXIN)
X (General Interconnect)
XQ
Table 11
shows the connections for each mul-
x312-2_34_021205
DS312-2 (v3.8) August 26, 2009
Product Specification
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