SAB9079 datasheet(21/48 Pages) PHILIPS

21 / 48 page

2000 Jan 13

Philips Semiconductors

Preliminary speciﬁcation

Multistandard Picture-In-Picture (PIP)

controller

SAB9079HS

Table 12 PIP numbering

ROW

COLUMN 0

COLUMN 1

COLUMN 2

COLUMN 3

PIPG0,0

PIPG0,1

PIPG0,2

PIPG0,3

PIPG1,0

PIPG1,1

PIPG1,2

PIPG1,3

PIPG2,0

PIPG2,1

PIPG2,2

PIPG2,3

PIPG3,0

PIPG3,1

PIPG3,2

PIPG3,3

ACQUISITION CONTROL

Acquisition control sets the reduction factors, the

acquisition fine positioning and the channel selection bits

are given in Table 13.

SHRed, SVRed, MHRed and MVRed

The reduction factors can be set in accordance with

Table 14.

SAHfp and SAVfp

The SAHfp and SAVfp bits control the horizontal

(2 pixels/step) and vertical (1 line/field/step) sub

acquisition positioning (upper left corner). When SAHfp is

set to logic 0, the sub channel will enter the freeze mode.

MAHfp and MAVfp

The MAHfp and MAVfp bits control the horizontal

(2 pixels/step) and vertical (1 line/field/step) main

acquisition positioning (upper left corner). When MAHfp is

set to logic 0, the main channel will enter the freeze mode.

SLSel and MLSel

Bits SLSel and MLSel select which PIP is updated.

A maximum of 16 PIPs can be displayed for the sub

channel. The number counting is done from the left to right

and from top to bottom.

If all PIPs are on (see Table 12) 16 PIPs are displayed.

If PIPs are put off the maximum number is limited to the

number of PIPs displayed. In the PIP mode where the

main and sub channel have the same reduction factors the

main channel can write in sub VDRAM address spaces

according to the same numbering. In all other cases MLSel

is inoperative and should be set to 0H. For replay and

other trick modes more PIPs can be stored and addressed

via the higher numbers (17 to 60). The numbers

61, 62 and 63 are not valid.

Table 13 Acquisition and channel selection bits

SUB

ADDRESS

DATA BYTES

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

18H

−

SVRed(2 : 0)

−

SHRed(2 : 0)

19H

−

MVRed(2 : 0)

−

MHRed(2 : 0)

1AH

SAHfp(7 : 0)

1BH

SAVfp(7 : 0)

1CH

MAHfp(7 : 0)

1DH

MAVfp(7 : 0)

1EH

−−

SLSel(5 : 0)

1FH

−−

MLSel(5 : 0)

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