
Philips Semiconductors
PNX8510/11
Analog Companion Chip
9397 750 08865
Koninklijke Philips Electronics N.V. Copyright 2001. All rights reserved.
Product data
Rev. 02 — 8 October 2001
41 of 84
Offset 0x77
TTXOVE
7:0
R/W
0x16
TTXOVE
Last line of occurrence of ttx data in odd field
line = (TTXOVS + 3) for M-systems
line = TTXOVE for other systems
PAL: TTXOVS = 0x16
NTSC: TTXOVS = 0x10
Offset 0x78
TTXEVS
7:0
R/W
0x4
TTXEVS
First line of occurrence of ttx data in even field
line = (TTXOVS + 4) for M-systems
line = (TTXOVE + 1) for other systems
PAL: TTXOVS = 0x04
NTSC: TTXOVS = 0x05
Offset 0x79
TTXEVE
7:0
R/W
0x16
TTXEVE
Last line of occurrence of ttx data in even field
line = (TTXOVS + 3) for M-systems
line = TTXOVE for other systems
PAL: TTXOVS = 0x16
NTSC: TTXOVS = 0x10
Offset 0x7A
FAL
7:0
R/W
0x24
FAL
First active line = FAL+4 for M-systems and = FAL+1 for other
systems. Measured in lines, FAL = 0 coincides with the first field
sync pulse.
Offset 0x7B
LAL
7:0
R/W
0x29
LAL
Last active line = LAL+3 for M-systems and = FAL for other
systems. Measured in lines, LAL = 0 coincides with the first field
sync pulse.
Offset 0x7C
TTXCTRL
7
R/W
0
TTX60
0 = Enables NABTS (FISE=1) or European TTX (FISE=0).
1 = Enables World Standard Teletext 60Hz (FISE=1).
6
R/W
1
LAL8
Bit 8 of LAL
5
R/W
0
TTXO
0 =New TTX protocol selected. At each rising edge of TTXRQ a
single TTX bit is requested.
1 = Old TTX protocol selected. The encoder provides a window of
TTXRQ. The length of the window depends on the chosen TTX
standard.
4
R/W
0
FAL8
Bit 8 of FAL
3
R/W
0
TTXEVE8
Bit 8 of TTXEVE
2
R/W
0
TTXOVE8
Bit 8 of TTXOVE
1
R/W
0
TTXEVS8
Bit 8 of TTXEVS
0
R/W
0
TTXOVS8
Bit 8 of TTXOVS
Offset 0x7D
Must be initialized to zero.
Offset 0x7E
DTTXL
7:0
R/W
0x00
DTTXL
Individual lines in both fields (PAL counting) can be disabled for
insertion of teletext by the respective bits.
Disabled line =LINExx(50Hz field rate).
Bit 7 = Line 12; Bit 0 = Line 5
The mask is only effective if the lines are enabled via TTXOVS/
TTXOVE and TTXEVS/TTXEVE.
Bits
Read/
Write
Reset
Value
Name
(Field or Function)
Description