SAA7127 PHILIPS [NXP Semiconductors], SAA7127 Datasheet - Page 22

• Manufacturer Part Number: SAA7127
• Description: Digital video encoder
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Table 40 Subaddress 75H
Table 41 Subaddresses 76H, 77H and 7CH
Table 42 Subaddresses 78H, 79H and 7CH
Table 43 Subaddress 7CH
Table 44 Subaddresses 7AH to 7CH
1999 May 31
VS_S
CSYNCA
TTXOVS
TTXOVE
TTXEVS
TTXEVE
TTXO
TTX60
FAL
LAL
DATA BYTE
DATA BYTE
DATA BYTE
DATA BYTE
DATA BYTE
Digital video encoder
vertical sync shift between RCV1 and RCV2 (switched to output); in master mode it is possible to shift
H-sync (RCV2; CBLF = 0) against V-sync (RCV1; SRCV1 = 00)
advanced composite sync against RGB output from 0LLC to 31LLC
first line of occurrence of signal on pin TTXRQ in odd field
last line of occurrence of signal on pin TTXRQ in odd field
first line of occurrence of signal on pin TTXRQ in even field
last line of occurrence of signal on pin TTXRQ in even field
first active line = FAL + 4 for M-systems, = FAL + 1 for other systems, measured in lines
last active line = LAL + 3 for M-systems, = LAL for other system, measured in lines
LOGIC
LEVEL
standard value: VS_S = 3
line = (TTXOVS + 4) for M-systems
line = (TTXOVS + 1) for other systems
line = (TTXOVE + 3) for M-systems
line = TTXOVE for other systems
line = (TTXEVS + 4) for M-systems
line = (TTXEVS + 1) for other systems
line = (TTXEVE + 3) for M-systems
line = TTXEVE for other systems
FAL = 0 coincides with the first field synchronization pulse
LAL = 0 coincides with the first field synchronization pulse
0
1
0
1
new TTX protocol selected: at each rising edge of TTXRQ a single TTX bit is requested
see Fig.14; default after reset
old TTX protocol selected: the encoder provides a window of TTXRQ going HIGH; the
length of the window depends on the chosen TTX standard see Fig.14
enables NABTS (FISE = 1) or European TTX (FISE = 0); default after reset
enables world standard teletext 60 Hz (FISE = 1)
DESCRIPTION
DESCRIPTION
22
DESCRIPTION
DESCRIPTION
DESCRIPTION
SAA7126H; SAA7127H
PAL: TTXOVS = 05H;
NTSC: TTXOVS = 06H
PAL: TTXOVE = 16H;
NTSC: TTXOVE = 10H
PAL: TTXEVS = 04H;
NTSC: TTXEVS = 05H
PAL: TTXEVS = 16H;
NTSC: TTXEVS = 10H
REMARKS
REMARKS
Product specification