Grass Valley LGK-3901 - Manual (Page 42)

GUIDE TO INSTALLATION AND OPERATION
36 | LGK-3901/DSK-3901
4.11 Graphics Co-Processors
The LGK-3901/DSK-3901 can be configured for use with the following Miranda Graphics Co-Processors:
• Miranda Imagestore Intuition+ Graphics Co-Processor
• Miranda VertigoXG Graphics Processor (Single channel)
The Co-Processor can generate complex output incorporating multiple objects (animations, clips, images and text) on
numerous virtual keying layers. These scenes are then composited into one signal that is fed into the card via Fill/Key
inputs and keyed as a ‘Load Live’ signal on any of the available keying layers. If this signal includes embedded audio
then this can provide voice-over input to the LGK-3901/DSK-3901 provided that the Audio option is enabled.
It is generally recommended that the Graphics Co-Processor be controlled from an independent Oxtel Protocol
Automation link. However, the LGK-3901/DSK-3901 can also be placed in a mode where it forwards commands to the
Co-Processor via a serial link. In this case only one Oxtel Protocol Automation control link is required.
Note: This does not apply to systems using Presmaster Protocol Automation control.
4.11.1 Command Forwarding to a Co-Processor
The keying layer parameter in the Oxtel Automation Protocol is always represented by a single zero-based ASCII
character in hexadecimal and so the character range is limited from 0x0 to 0xF. LGK-3901 has five keying layers and
DSK-3901 has two keying layers, and numbers for these keying layers are reserved. The higher numbers are then
used to address layers on the associated Graphics Co-Processor as per the following table:
LGK-3901 DSK-3901
Layer Number Co-Processor Layer Number Co-Processor
0x0 (DSK 1) 0x0 (DSK 1)
0x1 (DSK 2) 0x1 (DSK 2)
0x2 (DSK 3) 0x2 0x0
0x3 (DSK 4) 0x3 0x1
0x4 (DSK 5) 0x4 0x2
0x5 0x0 0x5 0x3
0x6 0x1 0x6 0x4
0x7 0x2 0x7 0x5
0x8 0x3 0x8 0x6
0x9 0x4 0x9 0x7
0xA 0x5 0xA 0x8
0xB 0x6 0xB 0x9
0xC 0x7 0xC 0xA
0xD 0x8 0xD 0xB
0xE 0x9 0xE 0xC
0xF 0xA 0xF 0xD