LF3370 datasheet(9/24 Pages) LODEV

Nome de Peças	LF3370

Descrição Electrónicos	High-Definition Video Format Converter

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Fabricante Electrônico	LODEV [LOGIC Devices Incorporated]

Página de início	http://www.logicdevices.com

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Video Imaging Products

9

LF3370

High-Definition Video Format Converter

03/13/2001–LDS.3370-F

DEVICES INCORPORATED

used to clear HF0 and HF1 during normal

operation (see HBLANK discussion).

HBLANK

HBLANK is used to replace portions of the

input data with user-defined blanking

levels. When HBLANK is LOW, blanking

level words are injected into the data

stream immediately after the Input LUT

section regardless of this section being

used or not. While HBLANK is LOW,

blanking level words are continually

injected into the datapath with user-

defined blanking words. Blanking words

are injected on the next rising clock edge

when HBLANK is LOW. In addition,

HBLANK clears flags HF0 and HF1 and

resetsa20-bitincrementingcounter(0-

1,048,575). If a HIGH to LOW transition

on HBLANK is detected on a rising edge of

clock, HF0 and HF1 are cleared and the

counter is reset on the following rising

edgeofclock(seeFigure10). KeyChannel

blankingmaybeindependentlyenabled

or disabled using Congifuration Register 1

(seeTable6).

HF0/HF1 and Counter

HF0 and HF1 are two independent flags

thataresetwhenthepre-programmed

HF0 or HF1 count value is equal to the 20-

bitincrementingcountervalue. Foreach

flag,oneuser-defined20-bitcountvalue

can be programmed. When HF0 or HF1

count value is equal to the counter value,

HF0 or HF1 is set on the next rising edge

of clock. Once the flags are set, they must

be reset if they are needed again. The

counter will increment by one at the rate

of CLK and can be reset by HBLANK.

The counter will continue to loop if not

FIGURE 11.

MATRIX MULTIPLIER AND KEY SCALER

A’

D

13

26

28

26

20(MSB)

L

RS

13

B’

20(MSB)

L

RS

13

C’

20(MSB)

L

RS

13

D’

20(MSB)

L

RS

13

26

13

26

13

26

13

26

13

26

13

26

13

26

13

26

Coef Bank 4

Coef Bank 0

13

Coef Bank 1

Coef Bank 2

Coef Bank 5

Coef Bank 6

Coef Bank 7

Coef Bank 8

26

28

26

28

13

26

13

A

13

Coef Bank 3

13

Coef Bank 9

26

B

C

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