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2. VCT 49xyI-F1
The VCT 49xyI-F1 is targeted to solve field and functional problems of the earlier VCT-I versions. For that purpose
some new registers were implemented. In addition workarounds used for VCT-I versions prior to F1 may not be
compatible.
The VCT 49xyI-F1 is pin-compatible to VCT 49xyI-D5.
Functional problems 50, 56, 57 and 58, 62, 64, 65, 66, 68, 69, 70, 71 have been solved. Problem 55 has been
solved but requires software initialisation. Field problems FP01, FP02 and FP03 have been solved, FP06 and FP07
are still under inverstigation. New features F19 and F20 have been successfully implemented.
Table 2–1: New features of VCT 49xyI-F1:.
No.
Feature
F19
Vertical Peaking
F20
Fastblank Output
Table 2–2: Field problems of VCT 49xyI-F1:
No.
Problem
FP06 VSP-AGC performance Poor performance with some non
FP07 Sync/H-PLL perfor-
mance
Table 2–3: Functional problems of VCT 49xyI-F1:
No.
Problem
73
FM Radio not working
74
ITU656 Biterror
CIRCUIT DESCRIPTIONS
Description
Additional mode for vertical peaking in 4H-combfilter allows switching
between 2H and 1H peaking filter. See new register VPM in section
2.1.2.
The fastblank signal of the TVT display generator is availbale as output
signal for LCD-Scaler applications. It can be programmed to the pin
PWMV, P11 and P21.
Description
standard signals
Poor performance with some VCR
tapes
Description
root causes:
a) fast carrier recovery is automati-
cally always ON, but should be
OFF for FM-Radio mode
b) When switching to FM-Radio
mode the output frequency some-
times will not be set correctly
Bit errors on ITU656 output data
produce noisy and unstable picture.
Comment
hardware redesign in F2
hardware redesign in F2
Comment
firmware redesign F2
workaround: s. 2.1.1.4. W3 & W4
metal fix F1
no workaround available
Ok
F1
F1
Ok
Ok
F2
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