LF3347 datasheet(1/10 Pages) LODEV

Part #	LF3347

Description	High-Speed Image Filter with Coefficient RAM

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Manufacturer	LODEV [LOGIC Devices Incorporated]

Direct Link	http://www.logicdevices.com

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DEVICES INCORPORATED

Video Imaging Products

LF3347

High-Speed Image Filter with Coefficient RAM

08/16/2000–LDS.3347-G

1

u

u 83 MHz Data Input and Compu-

tation Rate

u

u Four 12 x 12-bit Multipliers with

Individual Data and Coefficient

Inputs

u

u Four 256 x 12-bit Coefficient Banks

u

u 32-bit Accumulator

u

u Selectable 16-bit Data Output with

User-Defined Rounding and Limiting

u

u Two’s Complement Operands

u

u 3.3 Volt Power Supply

u

u 5 Volt Tolerant I/O

u

u 120-pin PQFP

FEATURES

DESCRIPTION

LF3347

High-Speed Image Filter with Coefficient RAM

DEVICES INCORPORATED

The LF3347 consists of an array of

four 12 x 12-bit registered multipliers

followed by two summers and a

32-bit accumulator. The LF3347

provides four 256 x 12-bit coefficient

banks which are capable of storing

256 different sets of filter coefficients

for the multiplier array. All multi-

plier data inputs are user accessible

and can be updated every clock cycle

with two’s complement data. The

pipelined architecture has fully

registered input and output ports and

an asynchronous three-state output

enable control to simplify the design

of complex systems.

A 32-bit accumulator allows cumula-

tive word growth which may be

internally rounded to 16-bits. Output

data is updated every clock cycle and

may be held under user control. The

data inputs/outputs and control

inputs are registered on the rising

edge of CLK. The Control/Coeffi-

cient Data Input, CC11-0, is registered

on the rising edge of CCCLK.

The LF3347 is ideal for performing

pixel interpolation in image manipu-

lation and filtering applications. The

LF3347 can perform a bilinear inter-

polation of an image (4-pixel kernels)

at real-time video rates when used

LF3347 BLOCK DIAGRAM

D111-0

12

ENB1

D211-0

12

ENB2

25

D311-0

12

ENB3

D411-0

12

ENB4

25

S15-0

ACC

OE

CLK

TO ALL REGISTERS

Coefficient

Bank 1

(256 x 12-bit)

Coefficient

Bank 2

(256 x 12-bit)

Coefficient

Bank 3

(256 x 12-bit)

Coefficient

Bank 4

(256 x 12-bit)

A7-0

8

ENBA

16

CC11-0

12

LD

Rounding

Selecting

Limiting

Circuit

Rounding/

Limiting

Registers

CCCLK

32

OCEN

466

NOTE: NUMBERS IN REGISTERS INDICATE

NUMBER OF PIPELINE DELAYS

3

2222

SHIFT4-0

LMTEN

SELLMT3-0

SELRND3-0

5

4

5

4

LF

INTERFACE

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