SAA7182A Datasheet, PDF (27/45 Pages) NXP Semiconductors – Digital Video Encoder EURO-DENC2

Philips Semiconductors
Digital Video Encoder (EURO-DENC2)
Preliminary specification
SAA7182A; SAA7183A
Table 33 Subaddress 73 to 75
DATA BYTE
DESCRIPTION
TTXHS
start of signal on pin TTXRQ (standard for 50 Hz field rate = tbf)
values above 1715 (FISE = 1) or 1727 (FISE = 0) are not allowed
TTXHE
end of signal on pin TTXRQ (standard for 50 Hz field rate = TTXHS + 1402)
values above 1715 (FISE = 1) or 1727 (FISE = 0) are not allowed
Table 34 Subaddress 76, 77 and 7C
DATA BYTE
DESCRIPTION
TTXOVS
first line of occurrence of signal on pin TTXRQ in odd field = TTXOVS + 1 (50 Hz field rate)
TTXOVE
last line of occurrence of signal on pin TTXRQ in odd field = TTXOVE (50 Hz field rate)
Table 35 Subaddress 78, 79 and 7C
DATA BYTE
DESCRIPTION
TTXEVS
first line of occurrence of signal on pin TTXRQ in even field = TTXEVS + 1 (50 Hz field rate)
TTXEVE
last line of occurrence of signal on pin TTXRQ in even field = TTXEVE (50 Hz field rate)
Table 36 Subaddress 7A to 7C
DATA BYTE
DESCRIPTION
FAL
first active line = FAL + 4 for M-systems, = FAL + 1 for other systems, measured in lines
FAL = 0 coincides with the first field synchronization pulse
LAL
last active line = LAL + 3 for M-systems, = LAL for other system, measured in lines
LAL = 0 coincides with the first field synchronization pulse
Table 37 Subaddress 7A to 7C
DATA BYTE
DESCRIPTION
LINE
individual lines in both fields (PAL counting) can be disabled for insertion of teletext by the respective
bits, disabled line = LINExx (50 Hz field rate)
this bit mask is effective only, if the lines are enabled by TTXOVS/TTXOVE and TTXEVS/TTXEVE
SUBADDRESSES
In subaddresses 5B, 5C, 5D, 5E and 62 all IRE values are rounded up.
1996 Oct 02
27