TB1311AFG Toshiba, TB1311AFG Datasheet - Page 22

• Manufacturer Part Number: TB1311AFG
• Manufacturer: Toshiba

Specifications of TB1311AFG

• Function: Programmable audio/video switching and frequency detection
• Features: CVBS, S-Video, YCbCr/RGB, SCART or D-pin, auto sync processor, pre-filter, dummy HD/VD output
• Operating Voltage: 9V, 5V
• Package: QFP80 (lead-free)

Automatic sync processing mode (A-SYNC)
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.
according to these READ data. Then, the SYNC1-IN pin is not used for format detection.
Manual sync processing mode (A-SYNC = OFF)
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.
Counted horizontal and vertical frequency data to input signal are returned to READ BUS functions, H, V FREQ DET.
In automatic sync processing mode (when A-SYNC = ON), this device operates as indicated in the following table
Note 3: Dummy HD and VD may become unstable while the mode is changing from one format to another.
In this mode, the SYNC1-IN pin is used only for detecting the input format and the SYNC2-IN pin is used only for
The following is an example of how to detect H/V frequency when A-SYNC = OFF.
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
FREQ2 setting when there is no input.
Input Condition
Standard format
Nonstandard
format
No input
By the way, in A-SYNC = OFF and H, V DMY = ON mode, dummy HD and VD are output according to the HV
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
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.
detected mode.
Fig. Signal route when A-SYNC = ON
2
CBUS data transmission in the course of prototype TV set evaluation.
The status indicates not
the current condition
but the last detected
format.
The status indicates not
the current condition
but the last detected
format.
The format as input
H, V FORMAT Status
HV-OUT FORMAT,
The status indicates not
the current condition but
the last detected format.
Preliminary
H, V FM2 Status
Unknown
22
Known:
Known
Fig. Signal route when A-SYNC = OFF
H, V IN Status
No input
Signal
Signal
The separated sync as
input
The separated sync as
input
Dummy HD and VD, of
which the frequency
depends on the HV-OUT
FORMAT status
TB1311AFG
HD, VD Outputs
2005-12-20