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SAA7118 Datasheet, PDF (42/169 Pages) NXP Semiconductors – Multistandard video decoder with adaptive comb filter and component video input
Philips Semiconductors
Multistandard video decoder with adaptive
comb filter and component video input
Preliminary specification
SAA7118
8.3 Decoder output formatter
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 9.5.1) 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;
subaddresses 41H to 57H).
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 5 to 8.
Table 4 Data formats at decoder output
DATA TYPE NUMBER
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DATA TYPE
teletext EuroWST, CCST
European closed caption
Video Programming Service (VPS)
wide screen signalling bits
US teletext (WST)
US closed caption (line 21)
video component signal, VBI region
CVBS data
teletext
VITC/EBU time codes (Europe)
VITC/SMPTE time codes (USA)
reserved
US NABTS
MOJI (Japanese)
Japanese format switch (L20/22)
video component signal, active video region
DECODER OUTPUT DATA FORMAT
raw
raw
raw
raw
raw
raw
Y-CB-CR 4 : 2 : 2
raw
raw
raw
raw
raw
raw
raw
raw
Y-CB-CR 4 : 2 : 2
2001 May 30
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