LF3320 datasheet(11/24 Pages) LODEV

Teilenummer	LF3320

Bauteilbeschribung	Horizontal Digital Image Filter

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Hersteller	LODEV [LOGIC Devices Incorporated]

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DEVICES INCORPORATED

Video Imaging Products

2-11

LF3320

Horizontal Digital Image Filter

08/16/2000–LDS.3320-N

I/D Register Data Path Control

The three multiplexers in the I/D

Register data path control how data

is routed through the forward and

reverse data paths.

The forward data path contains the

I/D Registers in which data flows

from left to right in the block diagram

in Figure 1. The reverse data path

contains the I/D Registers in which

data flows from right to left.

BITS

FUNCTION

DESCRIPTION

0

ALU Mode Filter A

0 : A + B

1: B – A

1

Pass A Filter A

0 : ALU Input A = 0

1 : ALU Input A = Forward Register Path

2

Pass B Filter A

0 : ALU Input B = 0

1 : ALU Input B = Reverse Register Path

11-3

Reserved

Should be set to “0”

TABLE 2.

CONFIGURATION REGISTER 0 – ADDRESS 200H

BITS

FUNCTION

DESCRIPTION

0

Filter A Odd-Tap

0 : Odd-Tap Interleave Mode Disabled

Interleave Mode

1 : Odd-Tap Interleave Mode Enabled

4-1

Filter A I/D Register Length

0000 :

1 Register

0001 :

2 Registers

0010 :

3 Registers

0011 :

4 Registers

0100 :

5 Registers

0101 :

6 Registers

0110 :

7 Registers

0111 :

8 Registers

1000 :

9 Registers

1001 :

1 0 Registers

1010 :

1 1 Registers

1011 :

1 2 Registers

1100 :

1 3 Registers

1101 :

1 4 Registers

1110 :

1 5 Registers

1111 :

1 6 Registers

5

Filter A Tap Number

0 : Even Number of Taps

1 : Odd Number of Taps

6

Filter A Data Reversal

0 : Data Reversal Enabled

1 : Data Reversal Disabled

11-7

Reserved

Should be set to “0”

TABLE 3.

CONFIGURATION REGISTER 1 – ADDRESS 201H

In Single or Dual Filter Modes, data

is fed from the forward data path to

the reverse data path as follows.

When the filter is configured for an

even number of taps, data from the

last I/D Register in the forward data

path is fed into the first I/D Register

in the reverse data path (see Figure 13).

When the filter is configured for an

odd number of taps, the data which

will appear at the output of the last

I/D Register in the forward data

path on the next clock cycle is fed

into the first I/D Register in the

reverse data path. Bit 5 in Configu-

ration Register 1 and Configuration

Register 3 configures Filters A and B

respectively for an even or odd

number of taps.

When interleaved data is fed through

the device and an even tap filter is

desired, the filter should be configured

for an even number of taps and the I/D

Register length should match the

numberofdatasetsinterleavedtogether.

When interleaved data is fed through

the device and an odd tap filter is

desired, the filter should be set to

Odd-Tap Interleave Mode. Bit 0 of

Configuration Register 1 and Configura-

tion Register 3 configures Filters A and

BrespectivelyforOdd-TapInterleave

Mode. When the filter is configured for

Odd-TapInterleaveMode,datafromthe

next to last I/D Register in the forward

data path is fed into the first I/D

Register in the reverse data path.

When the filter is configured for an odd

number of taps (interleaved or

non-interleaved modes), the filter is

structured such that the center data

value is aligned simultaneously at the A

and B inputs of the last ALU in the

forward data path. In order to achieve

the correct result, the user must divide

the coefficient by two.

Data Reversal

Data reversal circuitry is placed after the

multiplexers which route data from the

forward data path to the reverse data

path (see Figure 14). When decimating,

the data stream must be reversed in

order for data to be properly aligned at

the inputs of the ALUs.

When data reversal is enabled, the

circuitry uses a pair of LIFOs to reverse

the order of the data sent to the reverse

data path. TXFRA and TXFRB control

the LIFOs in Filters A and B respectively.

When TXFRA/TXFRB goes LOW, the

LIFO sending data to the reverse data

path becomes the LIFO receiving data

from the forward data path,andtheLIFO

receivingdatafrom the forward data

path becomes the LIFO sending data to

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