參數(shù)資料
型號(hào)： 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(yè)數(shù)： 26/37頁(yè)
文件大?。?/td> 1019K
代理商： TPU2735
TPU 2735
26
R-DC6 Display Control Register 6
address 0/24/29, 1-byte register
DS
HDA
HDA
HDA
D7
D6
D5
D4
D3
D2
D1
D0
DLS
HDA
HDA
HDA
DS:
DS = 1 doubles the display frequencies. When DS = 1
and DSEN = 0, the RGB horizontal period is 567.5 main
clock periods for PAL and 515 main clock periods for
NTSC.
double-scan mode
DLS:
DLS = 0 selects 24 display lines. DLS = 1 selects 25 dis-
play lines. DLS = 1 is only valid in PAL, D2MAC modes.
Row flag RRO is used to control line 25, (see section
8.5.). DLS also effects the number of lines cleared with
the CDS (Clear Display Sector) command (see section
7.8.).
Display lines
HDA:
A 6-bit binary number can be loaded into HDA to shift the
Teletext picture from the left towards the right edge of the
screen. The additional RGB delay generated by HDA is
in steps of 1/4 character.
horizontal display adjustment
= 12.2
μ
s for PAL/D2MAC and 10.8
= 15.6
μ
s for PAL/D2MAC and 14.6
é
é
é
Pin 31
ééééé
ééééé
Page Width
Pin 11
RGB Out
= minimum delay of the horizontal RGB start
from DSD at pin 31 (DSEN = 1)
= minimum delay of the horizontal RGB start
from horizontal blanking at pin 11 (DSEN = 0)
μ
s for NTSC
μ
s for NTSC
Fig. 7–3:
Horizontal display start in normal scan
mode
t
D1
t
D1
t
D0
t
D0
t
D1
t
D0
t
HDA
t
D1
t
D0
é
é
t
D1
t
D0
ééé
ééé
éé
éé
Defl. Skew
é
é
t
D1
éééé
Page Width
Pin 11
Pins 6 to 8
= minimum delay of the horizontal RGB start
from DSD at pin 31 (DSEN = 1)
= minimum delay of the horizontal RGB start
from horizontal blanking at pin 11 (DSEN = 0)
= 10.4
μ
s for PAL and 10.8
μ
s for NTSC
= 6.9
μ
s for PAL and 6.4
μ
s for NTSC
Fig. 7–4:
Horizontal display start in double-scan
mode
t
D1
t
D0
t
HDA
t
HDA
Main Clock
Period T
Double
Scan
Double Width
Pixel Width
(
Page Width
μ
s)
56.4/49.4 ns
56.4/49.4 ns
56.4/49.4 ns
56.4/49.4 ns
In NTSC mode the Teletext page is about 18% smaller than in PAL mode.
Display Timing
69.8 ns
69.8 ns
69.8 ns
69.8 ns
PAL/D2MAC
PAL/D2MAC
PAL/D2MAC
PAL/D2MAC
NTSC
NTSC
NTSC
NTSC
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
169.2 ns = 3
84.6 ns = 1.5
338.3 ns = 6
169.2 ns = 3
139.7 ns = 2
69.8 ns = 1
279.4 ns = 4
139.7 ns = 2
40.6
20.3
–
–
33.5
16.7
–
–
T
T
T
T
T
T
T
T
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