Motorola MSF 5000 Instruction Manual page 45

MSF
5000
Instruction Manual
Chapter
1
Description
Control Tray Overview
SECURE
BOARD
TTRC
LOGIC BOARD
Oo
E
SECURE CAPABLE
STATION CONTROL BOARD
TTRC
AUDIO BOARD
INSIDE
VIEW OF CONTROL
TRAY
MSFI085
022494JNM
Figure
1-3
Control Tray Board Location
Many
of the functions of the control and logic circuitry
are
implemented
with
Application
Specific Integrated Circuits
(ASICs).
The SSCB and
TTRC
each use
two
ASICs;
a
standard mode
ASIC
and an
I/O
mode
ASIC.
Both are custom
designed for this product. The operating mode is dependent on the state of the
input.
The standard
mode
ASIC
serves
as
a
specialized microprocessor support chip
with additional I/O
and data communication features. Major functions include
control of the seven-segment Status display,
High
Speed
Ring (HSR)
data bus,
MUxXbus,
RAM
read/write
enable, memory addressing,
audio gate control, and
various transmit and receive control signals.
The I/O
mode
ASIC
serves as an addressable collection of input buffers and
output
latches.
Major functions include:
control of
PL/connect
and alert tones
Motorola Radio Telephone Interface
(MRTI)
control lines
data from
RF
Tray
EEPOT
control
o
monitoring various control lines throughout the station
oa
driving
front panel transmit
LEDs
68P81092E02
3/19/94
1-7