參數(shù)資料
型號(hào): SAA5667HL/NNNN
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP100
封裝: 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-407-1, LQFP-100
文件頁(yè)數(shù): 68/112頁(yè)
文件大小: 537K
代理商: SAA5667HL/NNNN
2004 Sep 03
59
Philips Semiconductors
Product specication
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA56xx
22.1.6.4
Teletext memory organisation
The Teletext memory is divided into two banks of ten
blocks. Normally, when bit TXT1.EXT PKT OFF is logic 0,
each of blocks 0 to 8 contains a Teletext page arranged in
the same way as the basic page memory of the page
device (see Fig.19) and Block 9 contains extension
packets (applies to Bank 0 and Bank 1), see Fig.20.
When bit TXT1.EXT PKT OFF is logic 1, no extension
packets are captured and Block 9 of both Bank 0 and
Bank 1 of the memory are used to store two other pages.
The number of the memory block into which a page is
written corresponds to the page request number
(TXT2.REQ<3:0>) which resulted in the capture of the
page.
Packet 0, the page header, is split into two parts when it is
written into the text memory. The first eight bytes of the
header contain control and addressing information. They
are Hamming decoded and written into columns 0 to 7 of
row 25, which also contains the magazine number of the
acquired page and the PBLF flag. However, the last
14 bytes are unused and may be used by the software, if
necessary.
handbook, full pagewidth
Row 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
06
7
8
9
023
39
Packet X/0
Basic Page Blocks (0 to 9 Bank 0; 0 and 9 Bank 1)
OSD only
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(1)
GSA071
Control Data
VPS Data(2)
10(3)
Fig.19 Packet storage locations.
(1) If ‘X24 POSN’ bit = 1.
(2) VPS data only in block 9 of either bank 0 or bank 1.
(3) Byte 10 reserved.
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