參數(shù)資料
型號(hào)： SAA5532
廠商： NXP Semiconductors N.V.
英文描述： Enhanced TV microcontrollers with On-Screen Display OSD
中文描述： 與微控制器在強(qiáng)化電視屏幕顯示OSD
文件頁(yè)數(shù)： 45/100頁(yè)
文件大?。?/td> 371K
代理商： SAA5532
2000 Feb 23
45
Philips Semiconductors
Preliminary specification
Enhanced TV microcontrollers with
On-Screen Display (OSD)
SAA55xx
18.1.1
CVBS S
WITCH
The CVBS switch is used to select the required analog
input depending on the value of TXT8.CVBS1/CVBS0.
18.1.2
A
NALOG
-
TO
-D
IGITAL
C
ONVERTER
The output of the CVBS switch is passed to a
Differential-to-Single-Ended Converter (DIVIS), although
in this device it is used in single-ended configuration with
a reference. The analog output of the DIVIS is converted
into a digital representation by a full-flash ADC with a
sampling rate of 12 MHz.
18.1.3
M
ULTI
-
RATE VIDEO INPUT PROCESSOR
The multi-rate video input processor is a Digital Signal
Processor designed to extract the data and recover the
clock from a digitized CVBS signal.
18.1.4
D
ATA STANDARDS
The data and clock standards that can be recovered are
shown in Table 13.
Table 13
Data Slicing standards
18.1.5
D
ATA
C
APTURE TIMING
The Data Capture timing section uses the synchronisation
information extracted from the CVBS signal to generate
the required horizontal and vertical reference timings.
The timing section automatically recognizes and selects
the appropriate timings for either 625 (50 Hz)
synchronisation or 525 (60 Hz) synchronisation.
A flag TXT12.VIDEO SIGNAL QUALITY is set when the
timing section is locked correctly to the incoming CVBS
signal. When TXT12.VIDEO SIGNAL QUALITY is set
another flag TXT12.525/625 SYNC can be used to identify
the standard.
18.1.6
A
CQUISITION
The acquisition sections extracts the relevant information
from the serial stream of data from the MulVIP and stores
it in memory.
18.1.6.1
Making a page request
A page is requested by writing a series of bytes into the
TXT3.PRD<4:0> SFRwhichcorrespondstothenumberof
the page required. The bytes written into TXT3 are stored
in a RAM with an auto-incrementing address. The start
address for the RAM is set using the TXT2.SC<2:0> to
define which part of the page request is being written, and
TXT2.REQ<3:0> is used to define which of the 10 page
requests is being modified. If TXT2.REQ<3:0> is greater
than 09H, then data being written to TXT3 is ignored.
Table 14 shows the contents of the page request RAM.
Up to 10 pages of teletext can be acquired on the 10 page
device, when TXT1.EXT PKT OFF is set to logic 1, and up
to 9 pages can be acquired when this bit is set to logic 0.
Fora20 pagedevicethe10 pageacquisitionchannelsare
banked, the bank being selected using TXT2.ACQ BANK.
If the ‘Do Care’ bit for part of the page number is set logic 0
then that part of the page number is ignored when the
teletext decoder is deciding whether a page being
received off air should be stored or not. For example, if the
Do Carebitsforthefoursubcodedigitsareallsettologic 0
then every subcode version of the page will be captured.
Table 14
The contents of the Page request RAM
DATA STANDARD
CLOCK RATE
625 WST
525 WST
VPS
WSS
Closed Caption
6.9375 MHz
5.7272 MHz
5.0 MHz
5.0 MHz
500 kHz
START
COLUMN
PRD4
PRD3
PRD2
PRD1
PRD0
0
DO CARE
Magazine
DO CARE
Page Tens
DO CARE
Page
Units
DO CARE
Hour Tens
DO CARE
Hours
Units
DO CARE
Minutes
Tens
DO CARE
Minutes
Units
X
HOLD MAG2 MAG1 MAG0
1
PT3
PT2
PT1
PT0
2
PU3
PU2
PU1
PU0
3
X
X
HT1
HT0
4
HU3
HU2
HU1
HU0
5
X
MT2
MT1
MT0
6
MU3
MU2
MU1
MU0
7
X
X
E1
E0
相關(guān)PDF資料
PDF描述
SAA5532PS Enhanced TV microcontrollers with On-Screen Display OSD
SAA5533 Enhanced TV microcontrollers with On-Screen Display OSD
SAA5533PS Enhanced TV microcontrollers with On-Screen Display OSD
SAA5561PS Enhanced TV microcontrollers with On-Screen Display (OSD)(帶全屏顯示的增強(qiáng)型TV控制器)
SAA5564PS Enhanced TV microcontrollers with On-Screen Display (OSD)(帶全屏顯示的增強(qiáng)型TV控制器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SAA5532PS 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display OSD
SAA5533 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display OSD
SAA5533PS 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Enhanced TV microcontrollers with On-Screen Display OSD
SAA5540PS/NNNN 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:TV microcontrollers with Closed Captioning (CC) and On-Screen Display (OSD)
SAA5541PS/NNNN 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:TV microcontrollers with Closed Captioning (CC) and On-Screen Display (OSD)
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