
FUJISTU LIMITED PRELIMINARY AN D CONFIDENTIAL
MB86295S<Coral-LP>
66
Specification Manual Rev1.1
different from the display frame rate, frame s are skipped or the same frame is continuously displayed
automatically to match the two frame rates.
When the expected control code in input video stream is not detected, an error is generated. The error
status is returned in an register. When control code is not detected, pictures are taken in continuously
by predicting the timing by code input previously.
6.2.3 Non-interlace Transformation
Captured video graphics can be displayed in non-interlaced format. Two modes (BOB and WEAVE)
can be selected at non-interlace transformation.
- BOB Mode
In odd fields, the even -field rasters generated by average interpolation are added to produce one
frame. In even fields, the odd-field rasters generated by average interpolation are added to produce
one frame.
- WEAVE Mode
Odd and even fields are merged in the video capture buffer to produce one frame. Vertical resolutions
in the WEAVE mode are higher than those in the BOB mode but raster dislocation appears at moving
places.
When the VI bit of the video capture mode register (VCM) is “0”, data in the same field is used to
interpolate the interlace screen vertically. The interlace screen is doubled in the vertical direction.
When the VI bit is “1”, the interlace screen is not interpolated vertically.
6.2.4 Area Allocation
Allocate an area of about 2.2 frames to the video capture buffer. The size of this area is equivalent to
the size that considers the margin equivalent to the double buffer of the frame.
Set the starting
address and upper-limit address of the area in the CBOA/CBLA registers. Here, specify the raster
start position as the upper-limit address.
To allocate n rasters as the video capture buffer, set the upper-limit value as follows:
CBLA = CBOA + 64n X CBS
If CBLA does not match the head of a raster, video capture data is written beyond the upper limit by
only 1 raster (max.). Note that if other meaningful data is held in the area, the user-intended operation
is hindered by overwriting.
For reduced display, allocate the buffer area of the reduced frame size.