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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)： | 21/37頁 |
| 文件大?。?/td> | 1019K |
| 代理商： | TPU2735 |
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TPU 2735
21
7.4. The Display Selection Register, R-DS
R-DS controls the selection of a RAM sector for display.
The sector number of the displayed sector is either de-
termined by the TPU using R-PS or by the CCU.
R-DS Display Selection Register
address 0/24/20, 1-byte register
ERS
RPS
RPSV
LSB
D7
D6
D5
D4
D3
D2
D1
D0
Sector number of
displayed sector
SIC
NRS
MSB
*
*
*
*
*
*
ERS:
ERS = 1 means: the selected page has been received
with errors. ERS is for internal use of the TPU 2735.
error flag of the selected page
SIC:
The CCU has to set SIC = 1 when a new page number
is loaded into R-PS. SIC is reset by the TPU when RPS
is valid.
start internal comparison
NRS:
NRS = 1 means: the selected page has not yet been re-
ceived. NRS is only for internal use of the TPU.
new request flag of the selected page
RPS:
The TPU sets RPS to 1 if a page number of one of the
eight request registers is identical to the selected page
number of R-PS (see section 9., “Two Ways to Select a
Page for Display”). When RPS is set to one and Display
(R-DC3) and Acquisition Block (R-MC) are different, the
current magazine (in parallel magazine mode) is taken
from R-PS.
requested page is selected
RPSV:
Only if RPSV = 1 the value of RPS is valid. When R-PS
has been loaded with a new page number the TPU ac-
complishes a comparison within 20 ms. The result is
written into R-DS. When a comparison is accomplished
RPSV is set to 1. The CCU can reset RPSV after loading
R-PS and then check if RPSV is set to 1 again.
RPS flag valid
7.5. The Data Acquisition Control Register,
R-DAC
This register controls the slicer, the ghost compensation,
the acquisition of the page header and the skew data.
R-DAC Data Acquisition Control Register
address 0/24/21, 1-byte register
TBD
NRH
RGC
D7
D6
D5
D4
D3
D2
D1
D0
DSEN
RHA
NRT
NDA
NGC
*
TBD:
Set to 1 if the delay between horizontal and vertical
blanking pulse is more than 32 ms in field 1 of a TV
frame. TBD is used to adapt the TPU 2735 to different
sources of the blanking pulses required for synchroniza-
tion of the TPU (see Fig. 7–1). TBD must be set to 0 in
D2MAC mode.
vertical blanking delay
DSEN:
DSEN = 0: the horizontal display start is controlled by pin
11. DSEN = 1: the horizontal display start is controlled
by pin 31 (skew data).
deflection skew data enable
The TPU 2735 is able to adjust the horizontal phase of
the Teletext RGB signal under control of deflection skew
data (DSD) at pin 31. The phase can be adjusted by
steps of 1/16 of the main clock period, i. e. 3.5 ns for PAL
and 4.4 ns for NTSC. DSD provides a Teletext picture
without visible jitter even when there is no color burst in
the video signal and the DPU is not in the locked mode.
For more details refer to the description of the DPU 25..
Deflection Processor.
RHA:
NRT:
NRH:
rolling header always
no rolling time
no rolling header
Refer to
Table
Rolling
Header
Options
NDA:
Default value is NDA = 0. If NDA = 1, the Teletext data
acquisition is switched off.
no data acquisition;
NGC:
NGC = 1 switches off the ghost compensation
no ghost compensation
RGC:
Zero written to this bit resets the ghost compensation fil-
ter; returns automatically to 1 when the reset command
is executed.
reset ghost compensation;
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