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參數(shù)資料
| 型號： | SAA7138 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | The Digital Video Decoder/Encoder Modules(數(shù)字視頻譯碼器/編碼器模塊) |
| 中文描述： | 數(shù)字視頻解碼器/編碼器模塊（數(shù)字視頻譯碼器/編碼器模塊） |
| 文件頁數(shù)： | 29/53頁 |
| 文件大?。?/td> | 456K |
| 代理商： | SAA7138 |
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Module System: 7128MOD2
Philips Semiconductors
29
Application Note
AN 97085
Line Select for Clo-
sed Caption or exten-
ded data
6FH
This parameter selects one out of 32 possible position for Closed Caption
encoding; usually it is line 21 for NTSC corresponding to 11h.
Start / End RCV2
70H - 72H
These registers define start and end of a pulse repeating at line frequency:
Note that if ’Start’ is greater than ’End’, the pulse will be inverted.
Every high-state of the signal at pin TTXRQ - depending on the chosen
Text format - initiates the transfer of a new Teletext bit stream bit; as this
bit stream must match to the internal pixel counter, the start of the first
request pulse is programmable by TTXHD to accomodate to indiviual lat-
encies of the bit stream source.
TTXHS is an internally needed parameter and should be taken as given in
the datasheet.
In master mode (RCV1 and RCV2 as outputs), sometimes the phase of
the horizontal pulse on RCV2 must be shifted against the phase of the ver-
tical sync pulse on RCV1 in steps of 27 MHz clock cycles. This can be
accomblished with this parameter in 3 steps.
In order to compensate for shorter propagation of RGB signals through a
TV SCART input, the alternative CSYNC signal on the (usually) CVBS
DAC can be advanced up to 31 LLC clock cycles.
For the odd and even field, the lines to carry Teletext information can be
determined individually.
Note that it is possible to nearly use the complete inactive and the com-
plete active fields for Teletext insertion instead of video.
These parameters define the Vertical Blanking Interval if bit SBLBN = low.
Main purpose is to widen the range for active video input, as the input data
are ignored during the lines that are dedicated to belong to the Vertical
Blanking Interval. E.g., Time code could be inserted through the video
input port when FAL is programmed to start before the normal first active
line.
TTXO set to low enables the universal TTX protocol: At every rising edge
of TTXRQ a single TTX bit is requested.
TTXO set to high enables the older TTX protocol for compatability rea-
sons: The encoder provides a high state window of TTXRQ, and the length
of the window depends on the chosen Text standard.
Depending on the selected field frequency (Bit FISE), the Teletext stan-
dard is being selected through TTX60
Always program with 00H in order to avoid unexpected effects
Starting with line line 8, ending with line 23 inclusive, each of these lines
can be disabled for Teletext insertion (the respective bit set to high),
although enabled by the global window definitions for Teletext. This can
be useful in order to allow e.g. other information entering through the video
input to be inserted between lines containing Teletext.
Start / DelayTTXRQ 73H - 74H
VSYNC shift
75H
CSYNC advanced
75H
TTX odd / even
request VS/VE
76H-79H,
7CH
First / Last
Active Line
7AH - 7CH
TTX mode
7CH
NULL
7DH
Disable TTX Line
7EH - 7FH
Function
SubAdr
Description
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| SAA7140B | High Performance Scaler HPS |
| SAA7146AHZ | Circular Connector; No. of Contacts:66; Series:MS27472; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:18; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:18-35 RoHS Compliant: No |
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