sab9083 NXP Semiconductors, sab9083 Datasheet - Page 10

• Manufacturer Part Number: sab9083
• Description: Multistandard Picture-in-picture Pip Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
MPIPON (
Bit MPIPON is used to switch the main channel PIP on
(logic 1) or off (logic 0).
SPIPON
Bit SPIPON is used to switch the subchannel PIPs on
(logic 1) or off (logic 0).
P
The priority bit decides whether the main channel PIP (Prio
set to logic 0) or the subchannel PIP (Prio set to logic 1)
will be on top when both PIPs overlap.
S1FLD
If S1FLD is set to logic 0, two fields are used for the live
PIP. When a 50/60 Hz or a 60/50 Hz mode is detected, the
SAB9083 automatically switches to the 1-Field mode
(1-Field resolution vertically).
If S1FLD is set to logic 1, only one field is used. This
causes joint line errors but saves memory. This bit should
not be set in normal modes.
SF
With SFreeze set to logic 1, the current live subchannel
PIP will be frozen. If set to logic 0, it is unfrozen.
A
In double window mode, precautions are taken to prevent
a joint line error. Under some conditions, this feature
should be switched off. This can be realized by setting this
bit to logic 1. Normally, bit AlgOff should be set to logic 0.
Bit SV3, when set to logic 0, can overrule the AlgOff bit.
It is recommended to set SV3 to logic 1.
DN
In normal mode (this bit is logic 0), the SAB9083 calculates
whether a signal is non-interlaced and reacts accordingly.
With bit DNonint set to logic 1, the display channel is
forced into the non-interlaced mode. In the non-interlaced
mode, only one field is used during the processing of the
PIPs.
P
The PIP modes for the SAB9083 are shown in Table 2.
1999 Nov 12
RIO
LG
IP
Multistandard Picture-In-Picture (PIP)
controller
REEZE
ONINT
M
O
ODE
FF
DOUBLE WINDOW
)
10
Table 2 PIP modes
SHR
Bits SHRed<5:0> and SVRed<6:0> determine the
reduction factor in the double window mode.
The horizontal reduction is equal to SHRed/96; the vertical
reduction is equal to SVRed/96. SHRed should lie in the
range from 0 to 48; if set to logic 0, the PIP is off. SVRed
should lie in the range from 0 to 96; if set to logic 0, the PIP
is off.
When the horizontal reduction factor is 48/96,
704 samples are processed. The horizontal reduction
factor is linear; therefore, when it is 24/96, 352 samples
are processed. The same holds for the vertical reduction
factor but then with the number of lines. For NTSC, the
number of processed lines can be calculated from
SVRed/96
lines.
SHR
In replay mode, the range of SHRed and SVRed is limited
as follows: SHRed = 12; SVRed = 24, 16 or 12. This leads
to a fixed horizontal reduction factor of
vertical reduction factor of
Note that the resulting replay PIP can be expanded by
using SHBlow and/or SVBlow.
SHP
Bytes SHPic and SVPic control the picture size in the
multistandard PIP modes. The horizontal range
is 256 steps of four 28 MHz clock periods. The vertical
range is 256 steps of 1 line/field.
In the double window and replay PIP modes, the picture
size is determined by the reduction factors (SHRed and
SVRed) and bits HBlow and VBlow.
IC AND
ED AND
ED AND
PipMode<2:0>
SVP
SVR
SVR
000
001
010
011
100
111
228 lines; for PAL, this is SVRed/96
IC
ED
ED
(
MULTISTANDARD
(
(
DOUBLE WINDOW
REPLAY
1
)
4
,
1
multistandard PIP 6 split
6
double window mode
or
Preliminary specification
multistandard PIP 3
multistandard PIP 6
PIP
1
)
8
1
.
replay PIP
reserved
8
MODES
MODE
; and to a variable
SAB9083
)
276