TB1311AFG Toshiba, TB1311AFG Datasheet - Page 24
TB1311AFG
Manufacturer Part Number
TB1311AFG
Description
Manufacturer
Toshiba
Datasheet
1.TB1311AFG.pdf
(46 pages)
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)
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weakened signal strength.
No-input detection
This function detects whether there is input or not. It is useful for detecting no-input of 525i or 625i even if which is a
(1)0 (no-input) ! 1 (detected)
(2) 1 (detected) ! 0 (no-input)
Decide how to use no-input detection after making a thorough evaluation using a prototype TV set.
When Nmin
When N1
Where, Nmin: the number set by H COUNT MIN
Where, Nreset: the number set by SIG RESET N
Nmax: the number set by H COUNT MAX
Ndet: the number set by SIG DET N
N1: the number of the H-sync count in the counter during an internal window (approx. 2 ms)
N2: the number of conditions that “Nmin
N3: the number of conditions that “N1
Nmin, N1
N1
Nmax, and when N2
Nmax, and when N3
Fig. Block diagram for no-input detection
Preliminary
Ndet, SIG DET returns 1.
24
Nreset, SIG DET returns 0.
Nmin and N1
N1
Nmax” is detected
Nmax” is detected
TB1311AFG
2005-12-20
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