ep1c6t144i8es Altera Corporation, ep1c6t144i8es Datasheet - Page 15
ep1c6t144i8es
Manufacturer Part Number
ep1c6t144i8es
Description
Cyclone Fpga Family
Manufacturer
Altera Corporation
Datasheet
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Preliminary Information
Altera Corporation
Figure 8
One portion of the LUT generates the sum of two bits using the input
signals and the appropriate carry-in bit; the sum is routed to the output of
the LE. The register can be bypassed for simple adders or used for
accumulator functions. Another portion of the LUT generates carry-out
bits. An LAB-wide carry-in bit selects which chain is used for the addition
of given inputs. The carry-in signal for each chain, carry-in0 or
carry-in1, selects the carry-out to carry forward to the carry-in signal of
the next-higher-order bit. The final carry-out signal is routed to an LE,
where it is fed to local, row, or column interconnects.
shows the carry-select circuitry in an LAB for a 10-bit full adder.
Cyclone FPGA Family Data Sheet
15
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