TB1328FG Toshiba, TB1328FG Datasheet - Page 23
TB1328FG
Manufacturer Part Number
TB1328FG
Description
Manufacturer
Toshiba
Datasheet
1.TB1328FG.pdf
(47 pages)
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)
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No input detection
This function detects if there is an input or not. It is useful for detecting no-input of 525i or 625i, including signals of
weakened strength.
(1)0 (no-input)
(2) 1 (detected)
Determine the use of no-input detection following sufficient evaluations using a prototype TV set.
When Nmin ≦ N1≦ Nmax, and when N2 ≧ Ndet, SIG DET returns 1.
When N1 ≦ Nmin, N1 ≧ Nmax, and when N3 ≧ Nreset, SIG DET returns 0.
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 H-sync into the counter during an internal window (approx. 2ms)
N2: the number of condition where “Nmin ≦ N1 ≦ Nmax” is detected
N3: the number of condition where “N1 ≦ Nmin and N1 ≧ Nmax” is detected
1 (detected)
0 (no-input)
Fig. block diagram of no-input detection
23
TB1328FG
2006-11-13
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