SAA7108AE Datasheet, PDF (58/208 Pages) NXP Semiconductors – HD-CODEC

NXP Semiconductors
SAA7108AE; SAA7109AE
HD-CODEC
9.2 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 10.4.1)
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 Section 11.2.4.2 “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 7). 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 Figure 31 and Figure 32.
Table 20. Data formats at decoder output
Data type number Data type
Decoder output data format
0
teletext EuroWST, CCST
raw
1
European closed caption
raw
2
Video Programming Service (VPS)
raw
3
wide screen signalling bits
raw
4
US teletext (WST)
raw
5
US closed caption (line 21)
raw
6
video component signal, VBI region
Y-C_B-C_R 4 : 2 : 2
7
CVBS data
raw
8
teletext
raw
9
VITC/EBU time codes (Europe)
raw
10
VITC/SMPTE time codes (USA)
raw
11
reserved
raw
12
US NABTS
raw
13
MOJI (Japanese)
raw
14
Japanese format switch (L20/22)
raw
15
video component signal, active video region Y-C_B-C_R 4 : 2 : 2
SAA7108AE_SAA7109AE_3
Product data sheet
Rev. 03 — 6 February 2007
© NXP B.V. 2007. All rights reserved.
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