Motorola MSF 5000 Instruction Manual page 46

Chapter 1
Description
MSF
5000
Instruction Manual
Control Tray Overview
1-8
(PA
FULL,
PA ON,
Tx LOCK, PA KEY,
and
Tx CD)
0
interfacing
with
front panel switches
(PL Dis/Xmit, Acc Dis/Reset,
and Select
Set)
Microprocessor Core
The
microprocessor core runs the software that controls the station operation.
Most of
the core
functions
are
carried out using integrated circuits.
Data
Communications Circuitry
The SSCB logic circuitry communicates with various modules of
the station
through
three
primary
channels: the Inter-Processor Communications Bus
(IPCB),
the MUxXbus,
and the
HSR
data bus.
The IPCB is
a
low
speed serial
link
shared among
all Control Tray
boards and
optional expansion modules. Status and control signals
are routed through this
bus.
The MUXbus is
a
time-multiplexed address and data bus capable of carrying
64
bits of control and status information between modules. The
TTRC
acts as a
MUxXbus
slave,
while
the
SSCB
acts as the master.
The
HSR
bus is
a
unique multiprocessor communication mechanism.
A
40
bit
packet is circulated between
the
TTRC,
SSCB,
and the Secure board. Sixteen bits
are
written
to
by
the
TTRC,
16
bits are reserved for writes
by
the SSCB,
and
8
bits
are reserved for writes
by
the Secure board. The SSCB
acts as the
HSR
master
by
driving
the
clock and sync signals.
General Input/Output
The logic
control circuitry contains extensive input/output
(I/O)
capabilities
needed to control the station functions and monitor station status. The
I/O
circuitry allows
a local user
to
change the station configuration, as
well
as observe
status conditions.
This
is accomplished
by using MIC PTT, Xmit,
Acc/Dis, PL
Dis,
Select
/Set,
and
Display
change
via
the front panel of
the
Control
Tray.
Tone
Processing,
(SSCB
only)
Two
encoders
driven by
the
I/O
ASIC
provide
tone processing. The
tone
decoding capabilities
are
complementary to the encoding function. In
a
conventional coded squelch station, incoming
PL
tones or
DPL
codewords
are
detected.
In
a
trunked station, connect
tones are detected. These tones
and/or
codewords
are
part of
the receiver modulation.
Reset Circuitry
The power-up
reset
circuitry triggers
the
delayed
reset generator
during
self-diagnostic, over-voltage/low-voltage conditions, or
a
hard reset from the
front panel. The delayed reset generator outputs
a
DELAYED RESET
signal.
This
68P81092E02 3/19/94
Chapter 1
Description
MSF
5000
Instruction Manual
Control Tray Overview
1-8
(PA
FULL,
PA ON,
Tx LOCK, PA KEY,
and
Tx CD)
0
interfacing
with
front panel switches
(PL Dis/Xmit, Acc Dis/Reset,
and Select
Set)
Microprocessor Core
The
microprocessor core runs the software that controls the station operation.
Most of
the core
functions
are
carried out using integrated circuits.
Data
Communications Circuitry
The SSCB logic circuitry communicates with various modules of
the station
through
three
primary
channels: the Inter-Processor Communications Bus
(IPCB),
the MUxXbus,
and the
HSR
data bus.
The IPCB is
a
low
speed serial
link
shared among
all Control Tray
boards and
optional expansion modules. Status and control signals
are routed through this
bus.
The MUXbus is
a
time-multiplexed address and data bus capable of carrying
64
bits of control and status information between modules. The
TTRC
acts as a
MUxXbus
slave,
while
the
SSCB
acts as the master.
The
HSR
bus is
a
unique multiprocessor communication mechanism.
A
40
bit
packet is circulated between
the
TTRC,
SSCB,
and the Secure board. Sixteen bits
are
written
to
by
the
TTRC,
16
bits are reserved for writes
by
the SSCB,
and
8
bits
are reserved for writes
by
the Secure board. The SSCB
acts as the
HSR
master
by
driving
the
clock and sync signals.
General Input/Output
The logic
control circuitry contains extensive input/output
(I/O)
capabilities
needed to control the station functions and monitor station status. The
I/O
circuitry allows
a local user
to
change the station configuration, as
well
as observe
status conditions.
This
is accomplished
by using MIC PTT, Xmit,
Acc/Dis, PL
Dis,
Select
/Set,
and
Display
change
via
the front panel of
the
Control
Tray.
Tone
Processing,
(SSCB
only)
Two
encoders
driven by
the
I/O
ASIC
provide
tone processing. The
tone
decoding capabilities
are
complementary to the encoding function. In
a
conventional coded squelch station, incoming
PL
tones or
DPL
codewords
are
detected.
In
a
trunked station, connect
tones are detected. These tones
and/or
codewords
are
part of
the receiver modulation.
Reset Circuitry
The power-up
reset
circuitry triggers
the
delayed
reset generator
during
self-diagnostic, over-voltage/low-voltage conditions, or
a
hard reset from the
front panel. The delayed reset generator outputs
a
DELAYED RESET
signal.
This
68P81092E02 3/19/94