HW-SPAR3E-SK-US-G Xilinx Inc, HW-SPAR3E-SK-US-G Datasheet - Page 28
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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
The wide multiplexers can be used by the automatic tools or
instantiated in a design using a component such as the
F5MUX. The symbol, signals, and function are described
below. The description is similar for the F6MUX, F7MUX,
and F8MUX. Each has versions with a general output, local
output, or both.
Table 12: F5MUX Inputs and Outputs
28
I0
I1
S
LO
O
Signal
Figure 21: F5MUX with Local and General Outputs
Input selected when S is Low
Input selected when S is High
Select input
Local Output that connects to the F5 or FX CLB
pins, which use local feedback to the FXIN
inputs to the FiMUX for cascading
General Output that connects to the
general-purpose combinatorial or registered
outputs of the CLB
I0
I1
S
0
1
DS312-2_35_021205
Function
LO
O
www.xilinx.com
Table 13: F5MUX Function
Carry and Arithmetic Logic
For additional information, refer to the “Using Carry and
Arithmetic Logic” chapter in UG331.
The carry chain, together with various dedicated arithmetic
logic gates, support fast and efficient implementations of
math operations. The carry logic is automatically used for
most arithmetic functions in a design. The gates and multi-
plexers of the carry and arithmetic logic can also be used for
general-purpose logic, including simple wide Boolean func-
tions.
The carry chain enters the slice as CIN and exits as COUT,
controlled by several multiplexers. The carry chain connects
directly from one CLB to the CLB above. The carry chain
can be initialized at any point from the BX (or BY) inputs.
The dedicated arithmetic logic includes the exclusive-OR
gates XORF and XORG (upper and lower portions of the
slice, respectively) as well as the AND gates GAND and
FAND (upper and lower portions, respectively). These gates
work in conjunction with the LUTs to implement efficient
arithmetic functions, including counters and multipliers, typ-
ically at two bits per slice. See
S
0
0
1
1
Inputs
I0
X
X
1
0
I1
X
X
1
0
DS312-2 (v3.8) August 26, 2009
Figure 22
O
1
0
1
0
Product Specification
Outputs
and
Table
LO
14.
1
0
1
0
R
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