Tektronix Grass Valley 3000 - Manual (Page 211)

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Frame Store Operations (Option)
Video and Key
The Frame Store function can be assigned to either a video
channel or a key channel. Video and key channels may also be
selected simultaneously if video and key channels are mapped to
the same crosspoint.
Operations that can be independently set for video and key
channels are as follows:
■ Freeze
■ Grab
■ Field Modes
■ Mask
When VIDEO 1 and KEY 1 are delegated simultaneously, the key
channel settings are automatically aligned with the video channel
settings.
Mask Store
Use the mask store output as a source for the mask generators. It
may also be routed to the switcher crosspoint matrix for use as a
primary switcher input, and to an output module for use by
external devices. It can also used with a drawing tablet (Mask
Draw option) to allow an operator to draw masks and alter
existing video that has been frozen.