SAA7109 PHILIPS [NXP Semiconductors], SAA7109 Datasheet - Page 194

• Manufacturer Part Number: SAA7109
• Description: PC-CODEC
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
19.4
Table 242 shows some examples for the scaler
programming where:
The ratio is defined as:
In the following settings the VBI data slicer is inactive.
To activate the VBI data slicer, VITX[1:0] 86H[7:6] has to
be set to ‘11’. Depending on the VBI data slicer settings,
the sliced VBI data is inserted after the end of the scaled
video lines, if the regions of the VBI data slicer and scaler
overlap.
To compensate for the running-in of the vertical scaler, the
vertical input window lengths are extended by
2 to 290 lines, respectively 242 lines for XS, but the scaler
increment calculations are done with 288, respectively
240 lines.
19.4.3
Table 242 Example of configurations
2004 Mar 16
EXAMPLE
NUMBER
prsc = prescale ratio
fisc = fine scale ratio
vsc = vertical scale ratio.
PC-CODEC
1
2
3
4
Scaler and interfaces
E
XAMPLES
analog input to 8-bit I port output, with SAV/EAV codes, 8-bit
serial byte stream decoder output at X port; acquisition trigger
at falling edge vertical and rising edge horizontal reference
signal; H and V gates on IGPH and IGPV, IGP0 = VBI sliced
data flag, IGP1 = FIFO almost full, level 24, IDQ qualifier
logic 1 active
analog input to 16-bit output, without SAV/EAV codes, Y on
I port, C
acquisition trigger at falling edge vertical and rising edge
horizontal reference signal; H and V pulses on IGPH and IGPV,
output FID on IGP0, IGP1 fixed to logic 1, IDQ qualifier logic 0
active
X port input 8 bit with SAV/EAV codes, no reference signals on
XRH and XRV, XCLK as gated clock; field detection and
acquisition trigger on different events; acquisition triggers at
rising edge vertical and rising edge horizontal; I port output
8-bit with SAV/EAV codes like example number 1;
see Table 243
X port and H port for 16-bit Y-C
output selected); XRH and XRV as references; field detection
and acquisition trigger at falling edge of vertical and rising edge
of horizontal; I port output 8-bit with SAV/EAV codes, but Y only
output
SCALER SOURCE AND REFERENCE EVENTS
B
-C
---------------------------------------------------------- -
number of output pixel
number of input pixel
R
on H port and decoder output at X port;
B
-C
R
4 : 2 : 2 input (if no 16-bit
194
19.4.1
For trigger condition STRC[1:0] 90H[1:0] not equal ‘00’.
If the value of (YO + YS) is 262 (NTSC), and 312 (PAL)
the output field rate is reduced to 30 Hz and 25 Hz
respectively.
Horizontal and vertical offsets (XO and YO) have to be
used to adjust the displayed video in the display window.
As this adjustment is application dependent, the listed
values are only dummy values.
19.4.2
The maximum zoom factor is dependent on the back-end
data rate and is therefore back-end clock and data format
dependent (8 or 16-bit output). The maximum horizontal
zoom is limited to approximately 3.5, due to internal data
path restrictions.
T
M
RIGGER CONDITION
AXIMUM ZOOM FACTOR
720
704
720
720
WINDOW
INPUT
SAA7108E; SAA7109E
240 720
288 768
240 352
288 200
WINDOW
OUTPUT
240 prsc = 1;
288 prsc = 1;
288 prsc = 2;
80
Product specification
fisc = 1;
vsc = 1
fisc = 0.91667;
vsc = 1
fisc = 1.022;
vsc = 0.8333
prsc = 2;
fisc = 1.8;
vsc = 3.6
RATIOS
SCALE