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Appendix 1 Quad speed ADD-ON bus
The internal audio ADD-ON bus needed an upgrade for some applications.
We wanted more channels (32 per video stream seem possible in the near
future). And we want the bus to be bidirectional, so 32 channels in and 32
channels out at the same time.
The new interface needed to be compatible with all existing hardware
(frames) and in the implementation of the master card it sometimes needed
to be backward compatible with the original ADD-ON bus.
So the MASTER-CARD is now firmware enhanced to run 32 channels in either direction (64
channels total) instead of 16 channels in one direction
Some MASTER-CARD’s will have two modes and some MASTER-
CARD’s will only have the Quad Speed mode [where the logical ADD-ON
cards are only available in Quad Speed mode:
Dual mode MASTER-CARD’s have a menu item to select the appropriate
mode are. If a mode is selected all ADD-ON cards to that Master need to
be in the same mode.
The following features and rules will apply:
Up to 32 channels output from the master card with looping to up to 3
ADD-ON cards
The ADD-ON card just picks the channels it wants to process
Some ADD-ON cards will have the possibility to re-inject
processed audio onto the next ADD-ON card
Up to 32 channels input on the master card
If the master card can handle less than 32 channels, the lowest
channel numbers will be used, as the ADD-ON card will always
generate 32 channels (where some channels can be empty or
silent)
Channel shuffling is done in the ADD-ON card
The Master Card has only one setting to enable the quad speed