AT40K40-2DQC datasheet(10/67 Pages) ATMEL

Part #	AT40K40-2DQC

Description	5K - 50K Gates Coprocessor FPGA with FreeRAM

Download	67 Pages

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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10 / 67 page

10

AT40K/AT40KLV Series FPGA

0896C–FPGA–04/02

Figure 6. Some Single Cell Modes

DQ

Q

Q (Registered)

DQ

Synthesis Mode. This mode is particularly important for

the use of VHDL/Verilog design. VHDL/Verilog 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 AT40K/AT40KLV 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.

DSP/Multiplier Mode. This mode is used to efficiently

implement array multipliers. An array multiplier is an array

of bitwise multipliers, each implemented as a full adder

with an upstream AND gate. Using this AND gate and the

diagonal interconnects between cells, the array multiplier

structure fits very well into the AT40K/AT40KLV

architecture.

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

telecommunications applications, where data needs to be

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.

A

B

C

D

A

B

C

A

B

C

D

A

B

C

EN

Q

SUM (Registered)

SUM

and/or

PRODUCT

or

CARRY

PRODUCT (Registered)

CARRY

CARRY IN

and/or

or

and/or

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AT40K40-2DQC Datasheet(PDF) 10 Page - ATMEL Corporation

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