SAA7146AH-V4.557 datasheet(89/139 Pages) PHILIPS

Part #	SAA7146AH-V4.557

Description	Multimedia bridge, high performance Scaler and PCI circuit

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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89 / 139 page

2004 Aug 25

89

Philips Semiconductors

Product speciﬁcation

Multimedia bridge, high performance

Scaler and PCI circuit (SPCI)

SAA7146A

Table 85 Chrominance saturation control

7.12.8

CHROMA KEY

Table 86 Chroma key range

D7

D6

D5

D4

D3

D2

D1

D0

GAIN

01111111

1.999 (max. saturation)

010000001 (CCIR level)

000000000 (colour off)

OFFSET

(HEX)

NAME

BIT

TYPE

DESCRIPTION

74

VL

31 to 24

RW

set lower limit V for chroma keying (8-bit; twos complement):

1000 0000: as maximum negative value =

−128 signal level

0000 0000: limit = 0

0111 1111: as maximum positive value = +127 signal level

VU

23 to 16

RW

set upper limit V for chroma keying (8-bit; twos complement):

1000 0000: as maximum negative value =

−128 signal level

0000 0000: limit = 0

0111 1111: as maximum positive value = +127 signal level

UL

15 to 8

RW

set lower limit U for chroma keying (8-bit; twos complement):

1000 0000: as maximum negative value =

−128 signal level

0000 0000: limit = 0

0111 1111: as maximum positive value = +127 signal level

UU

7 to 0

RW

set upper limit U for chroma-keying (8-bit; twos complement):

1000 0000: as maximum negative value =

−128 signal level

0000 0000: limit = 0

0111 1111: as maximum positive value = +127 signal level

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