E F Johnson Company 2422001-1 Benutzerhandbuch

6-28

August 2000
Part No. 001-2001-200

6.9.1  INTRODUCTION

The Main Processor Card (MPC) connects to the 

computer with repeater software to program the 
repeater parameters, sets and reads the alarms, handles 
communication between repeaters, maintains the 
audio gating for the MAC, handles initialization 
requests from cards and contains the repeater RF data 
for the Receiver, Exciter and CWID.

Control functions for each repeater are performed 

by the Main Processor in the MPC installed in each 
repeater.  The MPC contains the main software and 
control over the repeater via microprocessor U27 (see 
Figure 6-17).

Information is exchanged between repeaters via a 

High-Speed Data Bus (HSDB) that interconnects all 
the MPCs.  This control technique is called distribu-
tive processing and it eliminates the need for a sepa-
rate system controller at each site.  The HSDB proces-
sor (U13) on the MPC provides these control 
functions.  The MPC also contains:

PROGRAMMABLE

DMA

CONTROLLER

SERIAL

COMMUNICATION

INTERFACE

GENERATOR

BAUD RATE

PROGRAMMABLE

INTERRUPT

CONTROLLER

CLOCK

TIME BASE CONTROLLER

PORT

PORT WITH

COMPARATOR

P2-0

P2-1

P2-2

P2-3

P2-4

P2-5

TxD0

RxD0

P1-6

CTS0

TxD1

RxD1

CTS1

P1-0

P1-1

P1-2

P1-3

P1-4

X1

X2

16-BIT TIMER

P1-5

REFRQ

P0-7

P0

P1

P2

PT0-PT7

V

TH

LC

etc.

PSW

PC

ALU

TA

TB

TC

INT RAM

256 BYTES

GR

MACRO
SERVICE
CHANNEL

INSTRUCTION DECODER

MICRO SEQUENCER

MICRO ROM

QUEUE

INT ROM

P1-4

EA

IOSTB

R/W

MREQ

MSTB

P1-7

P2-7

P2-6

RESET

B

U

S C

ONT

R

O

L

 L

O

GI

D7-D0

INC

PFP

STAGING

LATCH

STAGING

LATCH

ADM

A19-A0

16K BYTES