RGB Spectrum Quadra User's Guide - Manual (Page 13)

I N T R O D U C T I O N
Quadra Control
350-7951 Quadra User’s Guide 5
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• Maximum number of lines that can be processed
These factors are all interrelated with the system’s refresh rate (also known as
“frame rate”). When configuring a channel’s output, please keep the following
rules of thumb in mind:
• Sample rate is directly proportional to the product of:
(# of pixels per line) x (# lines) x (refresh rate)
Therefore, if a higher refresh rate is desired, the sample rate must be
increased. For example:
~ A 1600 x 1200 output @ 60 Hz refresh rate requires a pixel
clock of 162 MHz — which is equal to Quadra’s maximum
pixel clock of 162 MHz.
~ A 1600 x 1200 output @ 65 Hz refresh rate requires a pixel
clock of 175 MHz — which is greater than the maximum of
162 MHz.
• A higher refresh rate can also be achieved by reducing either the # of
pixels per line or the # of lines per frame.
For example:
~ A 1600 x 1200 output @ 85 Hz refresh rate requires a pixel
clock of 229.5 MHz — which is greater than the maximum
pixel clock of 162 MHz.
~ A 1280 x 960 output @ 85 Hz refresh rate requires a pixel
clock of 148.5 MHz — which is less than the Quadra
maximum pixel clock of 162 MHz.
When configuring your system, the important factor to remember is the
interrelation between specifications:
• Yes — you can adjust your system’s output resolution up to 1600
pixels by 1200 lines.
• Yes — you can adjust the system’s output horizontal scan rate from 12
to 125 kHz.
• No — you can not configure resolution at 1600 x 1200 with a refresh
rate of 100 Hz — because of the inherent interrelation between factors.
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Q U A D R A C O N T R OL
Using a command line interface, system control is provided via the RS-232
serial port or the 10/100 BaseT Ethernet port. There are no controls on the
Quadra chassis.
Note The ratio of active pixels per line to the number of active
lines is the aspect ratio, typically 4:3 or 16:9.