Grass Valley 8990ARC v.3.0 - Manual (Page 25)

8990ARC Instruction Manual 25
Configuration
Modified Wide Screen Signaling
Support for the Modified WSS is based on a modified version of the Stan-
dard WSS described in
Standard Wide Screen Signaling on page 24 . The
changes (described in the L23 specification) redefine the Group 1 bits to
match the AID bits of the Modified Video Index Coding specification. The
Group 2 bits have been redefined to match the ARD of the Modified Video
Index Coding. Both of these (AID/ARD) are described in
Modified Video
Index Coding on page 21 .
The operation of the module when the WSS control is enabled is the same
as when the Video Index Coding is enabled except the control information
is taken from a different part of the video and it is formatted differently.
Custom Wide Screen Signaling
Custom Wide Screen Signaling allows selection of the conversion mode
and tilt desired for each of the eight states of the least three significant bits
of the first octet with the web page controls. When the Custom mode is
selected, the LSB (Least Significant Bit) can be selected along with the
desired output mode.
For WSS the output selections are the same as those listed for the Video
Index Coding on
page 23 .
GPI Control
GPI control of four GPI registers can be enabled or disabled. Each register
can be saved and recalled with local or remote controls. Once a register is
saved, it can also be recalled with a GPI trigger from an external device. See
General Purpose Interface (GPI) Connections on page 10 .