SAA5290A Philips Semiconductors, SAA5290A Datasheet - Page 34

• Manufacturer Part Number: SAA5290A
• Description: Economy teletext and TV microcontrollers
• Manufacturer: Philips Semiconductors

Philips Semiconductors
8.8
Teletext packets each contain 40 bytes of data and one packet is stored in each row of the text memory, the row used
being dependent on the packet number.
Packet 0, the page header, is split into 2 parts when it is written into the text memory. The first 8 bytes of the header
contain control and addressing information. They are Hamming decoded and written into columns 0 to 7 of row 25.
1997 Jul 07
handbook, full pagewidth
Economy teletext and TV microcontrollers
(1) If X24 Position bit = 1.
(2) If X24 Position bit = 0.
Memory Organisation of SAA5290, SAA5291, SAA5291A and SAA5491
Basic Page Block
Row 0
Extension Packet Memory
Row 0
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
1
2
3
4
5
6
7
8
9
1
2
0
0
OSD only
Control Data
6 7 8
Fig.10 Packet storage locations.
aw/ag
9
VPS Data
Packet X/0
Packet X/1
Packet X/2
Packet X/3
Packet X/4
Packet X/5
Packet X/6
Packet X/7
Packet X/8
Packet X/9
Packet X/10
Packet X/11
Packet X/12
Packet X/13
Packet X/14
Packet X/15
Packet X/16
Packet X/17
Packet X/18
Packet X/19
Packet X/20
Packet X/21
Packet X/22
Packet X/23
Packet X/24
Packet X/24
Packet X/27/0
Packet 8/30
34
(1)
23
(2)
MGK467
39
SAA5x9x family
Preliminary specification