Philips Semiconductors
Preliminary specification
PAL/NTSC/SECAM video decoder with adaptive PAL/NTSC
comb filter, VBI-data slicer and high performance scaler
SAA7114H
8.2
Decoder output formatter
For each LCR value from 2 to 23 the data type can be
programmed individually. LCR2 to LCR23 refer to line
numbers. The selection in LCR24 values is valid for the
rest of the corresponding field. The upper nibble contains
the value for field 1 (odd), the lower nibble for field 2
(even). The relationship between LCR values and line
numbers can be adjusted via VOFF8 to VOFF0, located in
subaddresses 5BH (bit 4) and 5AH (bits 7 to 0) and FOFF
subaddress 5BH (bit D7). The recommended values are
VOFF[8:0] = 03H for 50 Hz sources (with FOFF = 0) and
VOFF[8:0] = 06H for 60 Hz sources (with FOFF = 1), to
accommodate line number conventions as used for PAL,
SECAM and NTSC standards; see Tables 4 to 7.
The output interface block of the decoder part contains the
ITU 656 formatter for the expansion port data output
XPD7 to XPD0 (for a detailed description see
Section 9.4.1) and the control circuit for the signals
needed for the internal paths to the scaler and data slicer
part. It also controls the selection of the reference signals
for the RT port (RTCO, RTS0 and RTS1) and the
expansion port (XRH, XRV and XDQ).
The generation of the decoder data type control signals
SET_RAW and SET VBI is also done within this block.
These signals are decoded from the requested data type
for the scaler input and/or the data slicer, selectable by the
control registers LCR2 to LCR24 (see also Chapter 15
“I2C-bus description”, subaddresses 41H to 57H).
Table 3 Data formats at decoder output
DATA TYPE NUMBER
DATA TYPE
teletext EuroWST, CCST
DECODER OUTPUT DATA FORMAT
0
1
raw
raw
raw
raw
raw
raw
European closed caption
Video Programming Service (VPS)
Wide screen signalling bits
US teletext (WST)
2
3
4
5
US closed caption (line 21)
6
video component signal, VBI region
CVBS data
YUV 4 : 2 : 2
7
raw
raw
8
teletext
9
VITC/EBU time codes (Europe)
VITC/SMPTE time codes (USA)
reserved
raw
10
11
12
13
14
15
raw
raw
US NABTS
raw
MOJI (Japanese)
raw
Japanese format switch (L20/22)
video component signal, active video region
raw
YUV 4 : 2 : 2
2000 Mar 15
32
NXP [ NXP ]
