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參數(shù)資料
| 型號： | TPU2735 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Teletext Processor |
| 中文描述： | 圖文處理器 |
| 文件頁數(shù)： | 5/37頁 |
| 文件大?。?/td> | 1019K |
| 代理商： | TPU2735 |
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TPU 2735
5
2. Functional Description
The TPU 2735 whose block diagram is shown in Fig.
2–1, operates according to a rigid timing determined by
the vertical cycle of the TV receiver. The data acquisition
period starts at line 7 with PAL or line 10 with NTSC and
ends at line 22 with PAL or line 21 with NTSC. During this
period, the input data is processed by a ghost filter which
is able to compensate reflections with short delay time
of 0 to 0.8
μ
s for PAL or 0 to 1
μ
s for NTSC. In the D2MAC
mode the acquisition is active from line 1 to 22 and line
313 to 334.
In the Data Acquisition Unit the Teletext information is
synchronized and identified. A comparator preselects
the pages with page numbers that are requested by the
CCU 2000 or CCU 3000 Central Control Unit and loads
them into the RAM. To eliminate speed problems of the
external Dynamic RAM, the data is buffered in an inter-
nal RAM buffer (Fig. 2–1). The comparator contained in
the data acquisition unit decides into which sector of the
DRAM the data is stored.
The display period starts at line 48 with PAL or line 50
with NTSC and ends at line 286 with PAL or line 242 with
NTSC. The display control unit selects one of the stored
eight pages for display. The 8-bit character words are
transformed into a 6 x 10 dot matrix with PAL or 6 x 8 dot
matrix with NTSC by a character generator (ROM) of 96
programmed characters and are displayed in 24 rows of
40 characters each. Optionally, 25 rows can be dis-
played in PAL/D2MAC. Different character sets are
available for eight languages under CCU or transmitter
control, the required character set being selected auto-
matically by the control bits C
12
Teletext page displayed. Every tenth line with PAL or
every eighth line with NTSC a new Teletext row is loaded
from the DRAM into the RAM buffer. When the RAM is
not accessed by the TPU 2735, the memory control re-
freshes the memory and handles CCU requests for RAM
access.
to C
14
of row 0 of the
Via the IM bus the CCU can access all RAM locations
and controls the TPU 2735 by loading the appropriate
registers in the RAM, so that the TPU 2735 can be used
to display text from other sources. The TPU 2735 can
display a list of contents of the stored eight pages
(menu) all by itself.The TPU 2735 can use either one 64
Kx1 bit Dynamic RAM or one 256 Kx1 bit Dynamic RAM.
So, RAM capacity is flexible to store up to 32 pages. The
DRAMs can be standard types (see section 3.).
TPU 2735
RAM Buffer
Memory
Data Bus 1
Data Bus 2
Start Address Bus
Data
Acquisition
Unit
Ghost
Compensation
Control
Unit
Display Control
Unit and
Character Gen.
Central
Timing and
Control
IM Bus
Interface
Data
27
28
29
30
35
16
15
14
31
36
13
12
11
9
8
7
6
32
33
34
5
4
3
2
1
40
39
10
17
18
19
21
22
23
24
25
26
A0
A7
A8
R
G
B
Bl.
H
V Res.
DSD
IM Bus
FM
8
8
8
8
6
V1
V6
GND
Bl.
R
G
B
38
D2–
DATA
Fig. 2–1:
Block diagram of the TPU 2735
RAS
CAS
R/W
V
SUP
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