5962-0325001QYC View Datasheet(PDF) - Atmel Corporation
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Description
MFG CO.
5962-0325001QYC Datasheet PDF : 42 Pages
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Figure 6. Some Single Cell Modes
A
B
C
DQ
D
A
DQ
B
C
Q (Registered)
and/or
Q
SUM
or
SUM (Registered)
and/or
CARRY
Synthesis Mode. This mode is particularly important for
the use of VHDL design. VHDL Synthesis tools generally
will produce as their output large amounts of random logic
functions. Having a 4-input LUT structure gives efficient
random logic optimization without the delays associated
with larger LUT structures. The output of any cell may be
registered, tri-stated and/or fed back into a core cell.
Arithmetic Mode is frequently used in many designs.
As can be seen in the figure, the AT40KEL040 core cell
can implement a 1-bit full adder (2-input adder with both
Carry In and Carry Out) in one core cell. Note that the
sum output in this diagram is registered. This output could
then be tri-stated and/or fed back into the cell.
A
B
C
D
CARRY IN
DSP/Multiplier Mode. This mode is used to efficiently
DQ
PRODUCT (Registered) implement array multipliers. An array multiplier is an array
or
of bitwise multipliers, each implemented as a full adder
PRODUCT
with an upstream AND gate. Using this AND gate and the
and/or
diagonal interconnects between cells, the array multiplier
structure fits very well into the AT40K architecture.
CARRY
DQ
Q
and/or
CARRY
Counter Mode. Counters are fundamental to almost all
digital designs. They are the basis of state machines,
timing chains and clock dividers. A counter is essentially
an increment by one function (i.e., an adder), with the
input being an output (or a decode of an output) from the
previous stage. A 1-bit counter can be implemented in one
core cell. Again, the output can be registered, tri-stated
and/or fed back.
Tri-state/Mux Mode. This mode is used in many
A
telecommunications applications, where data needs to be
B
C
Q
routed through more than one possible path. The output of
the core cell is very often tri-statable for many inputs to
many outputs data switching.
EN
10 AT40KEL040
4155I–AERO–06/06
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