SAB9081H/N3 查看數據表（PDF） - Philips Electronics

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SAB9081H/N3

Multistandard Picture-In-Picture (PIP) controller

Philips Electronics 

Philips Semiconductors

Multistandard Picture-In-Picture (PIP)

controller

Preliminary specification

SAB9081

SDSEL (REPLAY MODE)

Bits SDSel<5:0> select which PIP is read from memory.

Valid numbers are dependent on the maximum value of

SLSel.

DPAL AND SPAL

In normal operation (DPal and SPal are logic 0), the

SAB9081 calculates from the number of incoming lines

whether the signal is NTSC (< 288 lines) or PAL

(≥ 288 lines).

If DPal is set to logic 1, the main window is sized to

276 lines. If DPal is set to logic 1 and the subchannel is still

NTSC, the subchannel picture will be smaller than the

main channel picture (difference of approximately

40 lines).

If SPal is set to logic 1, the subchannel is forced to PAL

mode and 276 lines are acquired instead of 228 in NTSC

mode.

DNTSC AND SNTSC

In normal operation (DNTSC and SNTSC are logic 0), the

SAB9081 calculates from the number of incoming lines

whether the signal is NTSC (< 288 lines) or PAL

(≥ 288 lines).

If DNTSC is set to logic 1, the main window is sized to

228 lines. If DNTSC is set to logic 1 and the subchannel is

still PAL, the subchannel picture will be larger than the

main channel picture (difference of approximately

40 lines).

If SNTSC is set to logic 1, the channel is forced to NTSC

mode and 228 lines are acquired instead of 276 in PAL

mode.

SFBLKPKOFF

Bits SFBlkPkOff<1:0> shift signals FBL and PKOFF with

respect to the YUV output, by half pixels, see Table 4.

Table 4 Shifts of FBL and PKOFF

SFBlkPkOff<1:0>

00

01

10

11

SHIFT OF FBL AND PKOFF

no shift

+0.5 pixel

−0.5 pixel

−1 pixel

I2CHOLD

Bit I2CHold controls the updating of the I2C-bus controlled

function towards the PIP. If set to logic 1, some updates

are on hold until the bit is set to logic 0. At the next main

Vsync, all settings are passed to the PIP functions.

The bits and bytes that are on hold when the I2CHold bit is

set to logic 1 are:

• MPIPON, SPIPON, DNonint and PipMode

• SHBlow and SVBlow

• SHRed and SVRed

• BGHfp and BGVfp

• SDHfp and SDVfp

• SHPic and SVPic

• BGOn, BOn and Prio

• BSel, SBBrt and SBCol

• SDSel

• MDHfp and MDVfp

• HBWidth and VBWidth.

SV1

Bit SV1 controls the internal horizontal offset of the

background. When set to logic 0, the offset is 0.86 µs;

when set to logic 1, the offset is 4.56 µs.

SV2

Bit SV2, when set to logic 0, limits the range of the MAHfp

and SAHfp parameters. Otherwise (bit SV2 set to logic 1),

the parameters have their maximum range (which is

recommended).

SV3

Bit SV3, when set to logic 0, can overrule bit AlgOff when

the main channel is NTSC and the subchannel is PAL. In

this particular case, bit AlgOff is always set to logic 0

internally. Otherwise (bit SV3 set to logic 1), bit AlgOff is

never overruled. It is recommended to set SV3 to logic 1.

1999 Nov 12

11

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