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| 型号： | TB1311AFG |
| 元件分类： | 信号分离 |
| 英文描述： | SYNC SEPARATOR IC, PQFP80 |
| 封装： | 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 15/46页 |
| 文件大小： | 948K |
| 代理商： | TB1311AFG |
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TB1311AFG
2006-05-29
22
Automatic sync processing mode (A-SYNC)
Counted horizontal and vertical frequency data to input signal are returned to READ BUS functions, H, V FREQ DET.
Also, the detected format is returned to H, V FORMAT and H, V FM2 when the H/V frequencies are in internal defined
ranges. Input detection results for H, V-SYNC or HD,VD, which indicate whether or not input exists, are returned to H,V
IN. HV-OUT FORMAT indicates the active mode.
In automatic sync processing mode (when A-SYNC = ON), this device operates as indicated in the following table
according to these READ data. Then, the SYNC1-IN pin is not used for format detection.
Input Condition
HV-OUT FORMAT,
H, V FORMAT Status
H, V FM2 Status
H, V IN Status
HD, VD Outputs
Standard format
The format as input
Known
Signal
The separated sync as
input
Nonstandard
format
The status indicates not
the current condition
but the last detected
format.
Unknown
Signal
The separated sync as
input
No input
The status indicates not
the current condition
but the last detected
format.
Known:
The status indicates not
the current condition but
the last detected format.
No input
Dummy HD and VD, of
which the frequency
depends on the HV-OUT
FORMAT status
Note 3: Dummy HD and VD may become unstable while the mode is changing from one format to another.
Manual sync processing mode (A-SYNC = OFF)
In this mode, the SYNC1-IN pin is used only for detecting the input format and the SYNC2-IN pin is used only for
separating H and V syncs for HD and VD outputs. It is possible to detect some input formats by means of time-sharing
while separating syncs to another input.
The following is an example of how to detect H/V frequency when A-SYNC = OFF.
1. Input the signal from Yvi-OUT pin into the SYNC1-IN pin.
2. Read data such as H, V FREQ DET and H, V FORMAT.
3. Detect the H/V frequency by microprocessor or similar means, depending on the data obtained.
4. Input the detected signal into the SYNC2-IN pin and set HV FREQ2 and so on for the SYNC2-IN pin to the
detected mode.
5. Continue to monitor the obtained data for the SYNC1-IN pin, such as H, V FREQ DET and H, V FORMAT. When
any alterations are recognized, re-set HV FREQ2 and so on for the SYNC2-IN pin.
Decision algorithms (for detection range, detection times and so on) for H/V frequency detection should be determined
taking into account the above-mentioned errors in measuring H/V frequencies and other factors such as signal
conditions and I
2CBUS data transmission in the course of prototype TV set evaluation.
By the way, in A-SYNC = OFF and H, V DMY = ON mode, dummy HD and VD are output according to the HV
FREQ2 setting when there is no input.
I2
C
B
U
S
I2
C
B
U
S
Fig. Signal route when A-SYNC = ON
Fig. Signal route when A-SYNC = OFF
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