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AX2000 Datasheet(PDF) 70 Page - Microsemi Corporation

No. de pieza AX2000
Descripción Electrónicos  Axcelerator Family FPGAs
PDF  262 Pages
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Fabricante Electrónico  MICROSEMI [Microsemi Corporation]
Página de inicio  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

AX2000 Datasheet(HTML) 70 Page - Microsemi Corporation

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Detailed Specifications
2- 56
R e v i sio n 1 8
Carry-Chain Logic
The Axcelerator dedicated carry-chain logic offers a very compact solution for implementing arithmetic
functions without sacrificing performance.
To implement the carry-chain logic, two C-cells in a Cluster are connected together so the FCO (i.e. carry
out) for the two bits is generated in a carry look-ahead scheme to achieve minimum propagation delay
from the FCI (i.e. carry in) into the two-bit Cluster. The two-bit carry logic is shown in Figure 2-29.
The FCI of one C-cell pair is driven by the FCO of the C-cell pair immediately above it. Similarly, the FCO
of one C-cell pair, drives the FCI input of the C-cell pair immediately below it (Figure 1-4 on page 1-3 and
Figure 2-30 on page 2-57).
The carry-chain logic is selected via the CFN input. When carry logic is not required, this signal is
deasserted to save power. Again, this configuration is handled automatically for the user through
Microsemi's macro library.
The signal propagation delay between two C-cells in the carry-chain sequence is 0.1 ns.
Figure 2-29 • Axcelerator’s Two-Bit Carry Logic
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