Sierra Video 507109-00 - Manual (Page 3)

Composite to 270Mbps Video Converter User’s Guide 3
Rear Panel Control
The settings stored in the module can be entered and recalled via the two switches on the rear of the
module. This section describes the use of these switches. Note that a ‘nibble’ is a number from 0 to 15.
SWA - Switch A is used to select the parameter to be adjusted by switch B. These are the parameters and
their corresponding switch positions:
Table 1: SWA Positions and Their Functions
Sw. Function
Pos. Selected
0
Set 4 LSB’s of vertical blanking (0 for least blanking)
1 Set 4 MSB’s of vertical blanking (0 for least blanking)
2 Set 4 LSB’s of left edge blanking adjustment (in 74nsec. steps)
3 Set 4 MSB’s of left edge blanking adjustment (in 1.2usec. steps)
4 Set 4 LSB’s of right edge blanking adjustment (in 74nsec. steps)
5 Set 4 MSB’s of right edge blanking adjustment (in 1.2usec. steps)
6 Unused
7 Select ‘no source’ default video standard (0=U.S. NTSC, 1=Jap. NTSC, 2=std. PAL,
3=PAL-M)
8 Set 4 LSB’s of video ADC gain
9 Set 4 MSB’s of video ADC gain
A Set 4 LSB’s of setup
B Set 4 MSB’s of setup
C-D Unused.
E Set EEPROM reg. in which to save parameters.
F Recall parameters from EEPROM register.
SWB - Switch B expresses the numeric value of the parameter pointed to by Switch A. If Switch A enters
and leaves any mode without Switch B being changed, the parameter value stored in RAM for that mode
will not be influenced by the switch value. If Switch B is changed, the parameter pointed at by Switch A
will take on the value of Switch B until Switch A is changed to another setting. Here is an example of how
to set the video DAC gain to zero when Switch B is initially set to ‘0’:
1) set switch A to position 9,
2) change switch B to any value other than zero,
3) set switch B to zero,
4) set switch A to position 8,
5) change switch B to any value other than zero,
6) set switch B to zero.
In other words, to tell the module you want to change a value you must change switch B.
During numeric nibble entries, Switch B’s value expresses a hexadecimal number. This means switch
position A indicates a value of 10, position B, a value of 11, position C, a value of 12, position D, a value of