SAA7108AE Datasheet, PDF (79/208 Pages) NXP Semiconductors – HD-CODEC

NXP Semiconductors
SAA7108AE; SAA7109AE
HD-CODEC
The supported VBI data standards are shown in Table 28.
For lines 2 to 24 of a field, per VBI line, 1 of 16 standards can be selected (LCR24_[7:0] to
LCR2_[7:0] in 57h[7:0] to 41h[7:0]: 23 × 2 × 4 bit programming bits).
The definition for line 24 is valid for the rest of the corresponding field, normally no text
data (video data) should be selected there (LCR24_[7:0] = FFh) to stop the activity of the
VBI data slicer during active video.
To adjust the slicers processing to the input signal source, there are offsets in the
horizontal and vertical direction available: parameters HOFF[10:0] 5Bh[2:0] 59h[7:0],
VOFF[8:0] 5Bh[4] 5Ah[7:0] and FOFF[5Bh[7]].
Contrary to the scalers counting, the slicers offsets define the position of the
horizontal and vertical trigger events related to the processed video field. The trigger
events are the falling edge of HREF and the falling edge of V123 from the decoder
processing part.
The relationship of these programming values to the input signal and the recommended
values are given in Figure 31 and Figure 32.
Table 28. Data types supported by the data slicer block
DT[3:0] Standard type
62h[3:0]
Data rate Framing Code
(Mbit/s) (FC)
0000
teletext EuroWST, CCST 6.9375 27h
0001
European closed caption 0.500 001
0010
VPS
5
9951h
0011
wide screen signalling bits 5
1E 3C1Fh
0100
US teletext (WST)
5.7272 27h
0101
US closed caption (line 21) 0.503 001
0110
(video data selected)
5
none
0111
(raw data selected)
5
none
1000
teletext
6.9375 programmable
1001
VITC/EBU time codes
(Europe)
1.8125 programmable
1010
VITC/SMPTE time codes 1.7898 programmable
(USA)
1011
reserved
1100
US NABTS
5.7272 programmable
1101
MOJI (Japanese)
5.7272 programmable
(A7h)
1110
Japanese format switch 5
(L20/22)
programmable
1111
no sliced data transmitted 5
(video data selected)
none
FC window Hamming
check
WST625 always
CC625
VPS
WSS
WST525 always
CC525
disable
disable
general text optional
VITC625
VITC525
NABTS
Japtext
open
disable
optional
SAA7108AE_SAA7109AE_3
Product data sheet
Rev. 03 — 6 February 2007
© NXP B.V. 2007. All rights reserved.
79 of 208