Ziatech Corporation zPM10-2, Руководство по оборудованию, Страница: 17 / 94

Getting Started
4
SYSTEM RECOMMENDATIONS
The following topics discuss connecting to the analog video interface and the optional Feature
connector.
Analog Video Interface
The zPM11 must be used with an analog monitor. If your monitor is capable of both digital and
analog modes, be sure it is set to analog.
Discussion of monitor timing specifications for supporting various display modes is provided in
Appendix B.
The zPM11 can be used in a wide variety of video applications. There are several considerations,
however, that you must take into account when setting up a video system to ensure the best quality
display. Such factors as environment, noise from surrounding equipment, video mode, distance from
video source, and cabling all come into play.
The analog video signals are comprised of a horizontal and vertical sync and three color signals (red,
green, and blue). The signals are driven by a RAMDAC which is used to convert the digital video data
to analog signals. The RAMDAC's analog outputs have an impedance of 75
Ω
. Ideally, the connection
to this output should use high quality 75
Ω
shielded cable. See Chapter 3, "Output Connectors" for
more information
Feature Connector
The zPM11 has an optional connector location for a Feature connector that can be used for video
overlay applications or to drive flat panel displays that use a Feature connector interface (i.e., Planar
EL640.480-A). The Feature connector uses a 26-pin, double row, 0.100 inch spaced header. The
connector is located at the edge of the zPM11 near the video BIOS socket.
The Feature connector signals come directly from the VGA controller and consist of the same signals
that are fed to the RAMDAC for producing the analog display. This data is fed at the pixel clock rate
of the VGA controller. Depending on the graphics mode used, this can range from 12 to 28 MHz for
standard VGA modes. The Feature connector's useable upper limit is approximately 40 MHz, which
corresponds to a maximum resolution of 800 x 600. Because the Feature data can be at such a high
clock rate, you must be careful when cabling to the connector. As with any high speed data cable,
pay careful attention to noise reduction. Standard 28 gauge unshielded flat cable will work fine for
short distances but at longer lengths noise will begin to degrade the system and cause pixel
streaking. Shielded cable can be used for applications that require longer distances.
HARDWARE INSTALLATION
The zPM11 is designed to plug into a 150-pin CompactPCI mezzanine connector and a 16-pin video
output connector. Steps for installing the zPM11 onto a CPU board are as follows:
WARNING!
Installation of the zPM11 must be done at a static-free workstation to avoid damage to the CPU
board and the zPM11.
1. Turn off the power and remove the CPU board from the card cage.
2. Remove the screw from the open end of the nylon standoff on the zPM11.
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