Table of Contents
Advertisement
Cougar Video
4.1 Introduction
General
The 32X32 Video Matrix Card working in conjunction with the 16X16 Cros-
spoint Cards provides wide bandwidth performance for conventional
NTSC/PAL analog video signals. The 32X32 Video Matrix Card can ac-
commodate video signal amplitude levels up to 2V peak-to-peak. All the
32X32 Video Matrix Card's inputs are terminated into 75 ohms.
4.2 32X32 Video Matrix Card
The 32X32 Video Matrix Card contains a 32X32 matrix consisting of sev-
eral main circuits. This discussion will be broken down to the main circuits
as they are found on the schematics in Section 6 (Schematics).
Control
The microprocessor controller (U97) is used to interface switch commands
from the PRCI control port (U166) to the switch matrix and return status
information to the controller. Communications to and from the system con-
troller are through U69, a RS485 receiver and transmitter. System timing
is provided to the microprocessor by U102, a 7.3728MHz oscillator. The
microprocessor divides the timing single from the oscillator by a factor of
four to form the system clock signal. Reset for the microprocessor is pro-
vided by U85.
U89, a power supply monitor, monitors the output of the 32X32 Video Ma-
trix Card's power circuits and reports power fault conditions to the micro-
processor. CR17 is utilized by power supply monitor circuit to provide a
visual indication of power supply fault conditions.
Matrix output, input, and level coding is read from the backplane through
U76, U82, and U87 respectively. U95, U98, and U99 provide address de-
coding for the 32X32 Video Matrix Card.
U104 and U110 comprise the nonvolatile RAM for the processor. C250
provides memory backup voltage for approximately seven days as long as
the matrix card is not removed from the Cougar Frame. CR6 is utilized by
the processor on the 32X32 Video Matrix Card to indicate a CPU fault
condition. An external alarm connection is provided by U165. The external
connection can be utilized to audibly indicate CPU fault conditions.
11/97
P/N 81905903420
Functional
Section 4
4
F UNCTIONAL
DESC RIPTI ON
page 4.1
Advertisement
Table of Contents
