5
Q2:
Is Orchid basically the same as Scarlet, but without embedded SDRAM ?
The major difference is in fact the SDRAM which is limited to 2 MB (16 Mbit) in the Scarlet
device. For all applications which require more than 2 MB, the Orchid can be used. In this
case up to 32MB of SDRAM and FCRAM can be connected. Another difference is the analog
video output. The Orchid only has digital RGB and no DAC (Scarlet has both).
Q3:
Is Scarlet&Orchid Software-compatible to Cremson ?
Yes. All the register areas and display list formats of the common functions are identical. The
added functions like video input and geometry processors are separated. Software which was
developed using the Cremson evaluation-board MB86290EB-01 can also be used with
Scarlet. The only change that has to be made is to the memory mode register (MMR) - see the
demos provided for details.
Also special care has to be taken in terms of the limited frame memory size.
Q4:
Video Capture Unit of Scarlet&Orchid :
How can analog video signals be input to the interface ?
Scarlet&Orchid feature an ITU RBT656 (YUV 4:2:2) digital video interface. An external
decoder such as Phillips UAA711x is required to convert the analog video signals to this digital
format. The data stream will be read in from the Scarlet by the VI port and then written to
graphics memory.
Analog processing, upsampling filters etc. are part of the external decoder. For details, see the
application note about the video input unit of Scarlet !
Q5:
Video Capture Unit of Scarlet&Orchid :
Can different video input and display frame rates be used ?
Yes, this is possible. The video input unit can asynchronously write to the
frame grabber memory buffer and the circular buffer management will automatically
duplicate or leave out frames in order to adjust to the display frame rate.
Can different video input and display resolutions be used ?
Yes, the part to be grabbed from the video stream can be selected using the registers
CIHSTR, CIVSTR, CIHEND and CIVEND. The total size to be put in the frame memory is
determined by CHP und CVP. The size and position of the picture to be finally displayed can
be set by the register values of the W-layer which is dedicated for the video input module.
For details, see the application note about the video input unit of Scarlet !
