LF3320 查看數據表（PDF） - LOGIC Devices Incorporated

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LF3320

Horizontal Digital Image Filter

LOGIC Devices Incorporated 

DEVICES INCORPORATED

DEVICES INCORPORATED

LF3320

LF3320 Horizontal Digital Image Filter

Horizontal Digital Image Filter

FEATURES

DESCRIPTION

❑ 83 MHz Data Rate

❑ 12-bit Data or Coefficients (Expand-

able to 24-bit)

❑ 32-Tap FIR Filter, Cascadable for

More Filter Taps

❑ Over 49 K-bits of on-board Memory

❑ LF InterfaceTM Allows All 256

Coefficient Sets to be Updated

Within Vertical Blanking

❑ Various Operating Modes: Dual

Filter, Single Filter, Double Wide

Data or Coefficient, Matrix Multipli-

cation, and Accumulator Access.

❑ Selectable 16-bit Data Output with

User-Defined Rounding and Limiting

❑ Supports Interleaved Data Streams

❑ Supports Decimation up to 16:1 for

Increasing Number of Filter Taps

❑ 3.3 Volt Supply

❑ 144 Lead PQFP

The LF3320 filters digital images in the

horizontal dimension at real-time

video rates. The input and coefficient

data are both 12 bits and in two’s

complement format. The output is also

in two’s complement format and may

be rounded to 16 bits.

The LF3320 is designed to take

advantage of symmetric coefficient

sets. When symmetric coefficient sets

are used, the device can be configured

as a single 32-tap FIR filter or as two

separate 16-tap FIR filters.

When asymmetric coefficient sets are

used, the device can be configured as a

single 16-tap FIR filter or as two

separate 8-tap FIR filters. Multiple

LF3320s can be cascaded to create

larger filters.

Interleave/Decimation Registers (I/D

Registers) allow interleaved data to be

fed directly into the device and filtered

without separating the data into

individual data streams.

The LF3320 can handle a maximum of

sixteen data sets interleaved together.

The I/D Registers and on-chip accu-

mulators facilitate using decimation to

increase the number of filter taps.

Decimation of up to 16:1 is supported.

The LF3320 contains enough on-board

memory to store 256 coefficient sets.

Two separate LF InterfacesTM allow all

256 coefficient sets to be updated within

vertical blanking.

LF3320 BLOCK DIAGRAM

12

ROUT11-0

12

DIN11-0

8

CAA7-0

CENA

12

CFA11-0

PAUSEA

LDA

INTERLEAVE / DECIMATION

REGISTERS

256

COEFFICIENT

SET

STORAGE

16-TAP

FILTER A

16-TAP

FILTER B

256

COEFFICIENT

SET

STORAGE

12

RIN11-0

12

COUT11-0

8

CAB7-0

CENB

12

CFB11-0

PAUSEB

LDB

ROUND

SELECT

LIMIT

CIRCUITRY

CLK

OED

16

DOUT15-0

Video Imaging Products

2-1

08/16/2000–LDS.3320-N

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