TB1328FG Toshiba, TB1328FG Datasheet - Page 21

• Manufacturer Part Number: TB1328FG
• Manufacturer: Toshiba

Specifications of TB1328FG

• Function: Programmable audio/video switch and frequency detection
• Features: CVBS, S-Video or YcbrCr/RGB or D-connector, auto sync processor, pre-filter, dummy HD/VD output
• Operating Voltage: 9V,5V
• Package: QFP64 (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 internally-defined
ranges. Input detection results, which indicate whether there is an input or not, for H, V-SYNC or HD,VD, are returned to
H,V IN. HV-OUT FORMAT indicates the active mode.
according to these READ data. SYNC1-IN pin is also not used for detecting format.
Manual sync processing mode (A-SYNC=OFF)
and V syncs for HD and VD outputs. It is possible to detect some input’s 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 form one format to another.
In this mode, SYNC1-IN pin is used only for detecting the input format and SYNC2-IN pin is used only for separating H
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
Note also, in A-SYNC = OFF and H, V DMY = ON mode, dummy HD and VD are output according to HV FREQ2
setting when there is no input.
Standard format
Non-standard
format
No input
1. Input the signal from Yvi-OUT pin into 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 SYNC2-IN pin and set HV FREQ2 and so on for SYNC2-IN pin to the detected
5. Continue to monitor the obtained data for SYNC1-IN pin such as H, V FREQ DET and H, V FORMAT. When any
CONDITION
alterations are recognized, re-set HV FREQ2 and so on for SYNC2-IN pin.
mode.
Fig. The signal route when A-SYNC = ON
INPUT
2
CBUS data transmission in the course of prototype TV set evaluation.
The format as input
The status indicates not
the current
but the last detected
format.
The status indicates not
the current
but the last detected
format.
H, V FORMAT status
HV-OUT FORMAT,
condition
condition
The status indicates not
the current condition but
the last detected format.
H, V FM2 status
Unknown
21
Known:
Known
Fig. The 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
depends on the HV-OUT
FORMAT status
HD, VD outputs
TB1328FG
2006-11-13
the
frequency