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參數(shù)資料
| 型號： | TPU3035 |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 英文描述： | CONNECTOR ACCESSORY |
| 中文描述： | 連接器附件 |
| 文件頁數(shù)： | 7/73頁 |
| 文件大?。?/td> | 1183K |
| 代理商： | TPU3035 |
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TPU 3035, TPU 3040
PRELIMINARY DATA SHEET
MICRONAS INTERMETALL
7
Fig. 2–1:
Functional block diagram of TPU 3040
TPU 3040
MUX
Clamping
AGC
ADC
Slicer
DRAM
Interface
I
2
C-Bus
Interface
RGB &
PRIO
Interface
65C02
Program
ROM
Program
RAM
WST
Layer
OSD
Layer
DMA
Interface
Character
ROM
Sync
Interface
Clock
Generator
42
44
43
1
22 23 24
19
20
21
2
29
27
28
25
26
40
41
34
35
31
33
36
37
38
39
7–18
3
4
5
6
30
32
Timer
Interrupt
Watchdog
Skew
Delay
2.2. Teletext Acquisition
The only task of the slicer circuit is to extract teletext lines
from the incoming composite video signal and to store
them into the acquisition scratch buffer of the external
DRAM. No page selection is done at this hardware level.
Two analog sources can be connected, thus it is pos-
sible to receive text from one channel while watching
another on the screen. After clamping and AGC amplifi-
er the analog video signal is converted into binary data.
Sync separation is done by a sync slicer and a horizontal
PLL, which generate the horizontal and vertical timing.
By these means no external sync signals are needed
and any available signal source can be used for teletext
reception.
The teletext information itself is acquired using adaptive
slicers on bit and byte level with soft error detection to
decrease the bit error rate under bad reception condi-
tions. The slicer can be programmed to different bit rates
for reception of PAL, NTSC or MAC world system tele-
text as well as VPS,WSS or CAPTION signals.
2.3. Teletext Page Management
As a state-of-the-art teletext decoder the TPU 3040 is
able to store and manage a sufficient number of teletext
pages to absorb the annoying transmission cycle times.
The number of available pages is only limited by the
memory size. With an intelligent software and a 16 Mbit
DRAM it is possible to store and to control more than
2000 teletext pages.
The management of such a data base is a typical soft-
ware task and is therefore performed by the 65C02. Us-
ing a fixed length page table with one entry for every pos-
sible page, the software distributes the content of the
acquisition scratch buffer among the page memory. The
page size is fixed to 1 KByte, only ghost rows are
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