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⟦298798db3⟧ Wang Wps File
Length: 11124 (0x2b74)
Types: Wang Wps File
Notes: CPS/SDS/001 system design
Names: »0486A «
Derivation
└─⟦6f17b967f⟧ Bits:30006000 8" Wang WCS floppy, CR 0035A
└─ ⟦this⟧ »0486A «
WangText
…02…CPS/SDS/001
…02…BHJ/800115…02……02…
CAMPS SYSTEM DESIGN SPECIFICATION
…02……02…CAMPS
5.4 W̲A̲T̲C̲H̲D̲O̲G̲ ̲H̲W̲
5.4.1 S̲u̲m̲m̲a̲r̲y̲ ̲o̲f̲ ̲R̲e̲q̲u̲i̲r̲e̲m̲e̲n̲t̲s̲
5.4.1.1 S̲u̲b̲s̲y̲s̲t̲e̲m̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
5.4.1.1.1 G̲e̲n̲e̲r̲a̲l̲ ̲D̲e̲s̲c̲r̲i̲p̲t̲i̲o̲n̲
The main feature of the watchdog HW package is to enable
monitoring and controlling of correct configuration
in the CAMPS system:
- Receive error reports from the PU's
- Receive "keep alive" messages from the PU's
- Monitoring status of hardware
- Control physical device allocation e.g. isolate
a HW device
- Determine a switch-over in case of a PU failure
The WD consists of 4 major components:
- Watchdog CPU (WPU)
- Watchdog CPU adaptor (WCA)
- Watchdog panel controller (WPC)
- Crate configuration adaptor (CCA)
The WPU is a standard LTU which boots its program from
an EPROM located on the WCA. 4 x V24 ports ensure the
WD capability of interfacing e.g. 2 PU, 1 VDU and 1
LP.
The WPU communicates with the CCA's, BSM-X's and WPC
through a 16 p flat cable configuration bus, which
uses serial communication based on the single chip
PAM system.
The WCA also contains a failsafe circuit, which in
case of a failure in the WD CPU, will switch over to
the WPC, the system is hereby in manual mode.
The WPC consists of a single chip processor, the major
task of which is to scan the switches set on its front
panel and convey the settings to the CCAs and BSM-X's
via the configuration bus, using PAM serial communication.
Status is read back and displayed on the front panel
of the WPC. In CAMPS the WPC is not used. Thus, in
manual mode no monitoring or control is performed,
and isolation of a physical device has to be done in
the individual crates via manual switches.
The reason for not using the WPC facility is to avoid,
that in the case the engineer has forgotten to update
the switches on the front panel, we will have a wrong
configuration if the WD CPU fails.
The CCA contains 1 PAM circuit, 1 A/D converter and
a number of multiplexed latches. The PAM circuit is
an addressable asynchronous receiver and transmitter.
Via the configuration bus it receives two eleven-bit
words in a serial data stream. The first of the incoming
words contains the PAM address and if the address matches,
the PAM will receive the next eleven-bit data word.
This word is used as a pointer to the latch you want
to control or monitor. The PAM will after receipt of
the second word, retransmit status of the latch in
two eleven-bit words. Each of the transmitted words
contains eight data bits, even parity bit, start and
stop bit.
5.4.1.1.2 R̲e̲f̲e̲r̲e̲n̲c̲e̲ ̲t̲o̲ ̲o̲t̲h̲e̲r̲ ̲S̲u̲b̲s̲y̲s̲t̲e̲m̲s̲
CR80D
TDX
RACK
5.4.1.1.3 E̲x̲t̲e̲r̲n̲a̲l̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲s̲
None.
5.4.1.1.4 B̲l̲o̲c̲k̲ ̲D̲i̲a̲g̲r̲a̲m̲
A block diagram showing the interfaces of this package
is depicted on fig. 5.4.1.1.4 -1.
5.4.1.2 S̲u̲b̲s̲y̲s̲t̲e̲m̲ ̲F̲u̲n̲c̲t̲i̲o̲n̲s̲
This section describes how the WD via V24, CCAs and
BSM-X's controls and monitors the different types of
assemblies within the CAMPS system.
a) Processor Unit Assembly
b) Channel Unit Assembly
c) TDX Crate Assembly
5.4.1.2.1 P̲r̲o̲c̲e̲s̲s̲o̲r̲ ̲U̲n̲i̲t̲ ̲A̲s̲s̲e̲m̲b̲l̲y̲
The monitoring and control of the two PUs is done through.
- 2 x V24 interface
- Crate Configuration Bus
The PUs send status and "alive" messages to the watchdog
via the 2 x V24 lines.
The monitoring and control of switches and voltages
is done via the serial Configuration bus and the CCA.
ref. fig. 5.4.1.2.1.
The front panel of the MAP includes a PU disable switch
which controls the connect/disconnect state of the
MIA and the 2 TIAs. (Ref. fig. 5.4.1.2.1-1).
Fig. 5.4.1.1.4-1
Fig. 5.4.1.2.1-1…01…A,B,E, F's functions are described overleaf.
C̲C̲A̲ ̲F̲u̲n̲c̲t̲i̲o̲n̲s̲ ̲(̲P̲U̲)̲ ̲S̲u̲m̲m̲a̲r̲y̲
Referring to fig. 5.4.1.2.1-1.
…02……02……02…Analog Digital Digital
i̲n̲p̲u̲t̲s̲ i̲n̲p̲u̲t̲ o̲u̲t̲p̲u̲t̲
̲
A. Supervision of analog
voltages (+5, +/- 12V) 3 -
-
B. 1. Controlling the connect/
disconnect state of the
MIA + TIA's - -
1
2. Issue "Maintenance Mode"
to the MAP - -
1
3. Monitoring the state of
the auto/manual switch - 1
-
E. Individual self-test
results - -
-
F. Issue "Master Clear"
command to the MAP - -
1
5.4.1.2.2 C̲h̲a̲n̲n̲e̲l̲ ̲U̲n̲i̲t̲ ̲A̲s̲s̲e̲m̲b̲l̲y̲
The CCA control and monitoring path to the CU is, to
improve the WD control, given an extra set of lines,
i.e. 2 control and 2 monitor lines.
Via the 2 control lines the WD controls the "take ownership"
command as follows for all units together i.e.
a) Enable via I/O Bus A, enable via I/O Bus B
b) Disable via I/O Bus A, enable via I/O Bus B
c) Enable via I/O Bus A, disable via I/O Bus B
d) Disable via I/O Bus A, disable via I/O Bus B
In manual mode a three-position switch on the front
panel of each of the units (i.e. disk controller, floppy
disk controller, LTU) makes it possible to enable "TAKE
OWNERSHIP" from either I/O BUS A or I/O BUS B is issued.
This feature can be used during an integration or
maintenance phase, see fig. 5.4.1.2.2-1.
The use of the 2 extra monitor lines is:
- One indicating to the WD whether or not one or
more of the switches are out of auto.
- The other monitors the results of the built-in
tests.
C̲C̲A̲ ̲F̲u̲n̲c̲t̲i̲o̲n̲s̲ ̲(̲C̲U̲)̲ ̲S̲u̲m̲m̲a̲r̲y̲
Referring to fig. 5.4.1.2.2-1.
Analog Digital Digital
I̲n̲p̲u̲t̲s̲ i̲n̲p̲u̲t̲s̲ o̲u̲t̲p̲u̲t̲
̲
A. Monitor dualized supply
voltages (+5, +/- 12V) 6 -
-
B. Monitor (wired-or) state
of front panel switches
(Auto/non auto) - 1
-
C. Controlling "Take owner-
ship" - enable/disable - -
2
D. Monitors card self-test
results (wired-or) - 1
-
E. Individual self-test
results - -
-
Fig. 5.4.1.2.2-1…01…A,B,C,D's functions
5.4.1.2.3 T̲D̲X̲ ̲C̲r̲a̲t̲e̲ ̲A̲s̲s̲e̲m̲b̲l̲y̲
The control and monitoring of this crate is done via
a BSM-X module containing the CCA .
The BSM-X assigns either the TDX Bus #1, TDX Bus #2
or none to the internal crate TDX Bus. The assignment
is controlled by the WD or manually by two switches
on the front panel of the BTM-Y.
One of the switches is an auto/manual switch controlling
the assignment source. In auto the WD is in control
else the other switch connects TDX Bus #1, TDX Bus
#2 or none.
The WD monitors the auto/manuel switch for an auto/non
auto indication.
In addition to the above mentioned functions the WD
also monitors the power supply voltages in the different
crate assemblies.
C̲C̲A̲ ̲F̲u̲n̲c̲t̲i̲o̲n̲s̲ ̲(̲T̲D̲X̲)̲ ̲S̲u̲m̲m̲a̲r̲y̲
Referring to fig. 5.4.1.2.3-1.
…02……02……02… Analog Digital Digital
I̲n̲p̲u̲t̲s̲ I̲n̲p̲u̲t̲s̲ O̲u̲t̲p̲u̲t̲s̲
A. Monitor supply voltages
(+5, +/- 12V) 3 -
-
B. Monitor results (wired-
or) of individual self-
test routines - 1
-
C. 1. Controlling bus
assignment - -
2
2. Monitor state of auto/
manual switch - 1
-
D.* Monitor TDX-controller
status (RS, TS, FS,
CO1/2 - -
-
E. Result of individual self-
test if any - -
-
* In the two crates with the TDX-controllers a V
24/V28 monitoring point is implemented.
Fig. 5.4.1.2.3-1…01…A,B,C,D,E's functions
5.4.1.2.4 V̲D̲U̲ ̲&̲ ̲L̲P̲
The VDU, which includes a keyboard, and the LP are
connected to the WD via one V24 interface. By means
of these devices the system engineer is able to decide
and execute control of the system.
5.4.1.3 S̲u̲b̲s̲y̲s̲t̲e̲m̲ ̲C̲o̲n̲t̲r̲o̲l̲
5.4.1.3.1 S̲y̲n̲c̲h̲r̲o̲n̲i̲z̲a̲t̲i̲o̲n̲
N.A.
5.4.1.3.2 H̲a̲r̲d̲w̲a̲r̲e̲ ̲C̲o̲n̲t̲r̲o̲l̲
Configuration control can be operated in the following
ways.
- Automatically by the WD program
- Manually by the VDU + keyboard through the WD
- Manually via switches on each crate assembly indepent
of the WD
Built-in tests in the various modules may be activated
in the following ways by the WD.
- Manually by the VDU and keyboard through the WD
- Automatically by the WD program.
Fig. 5.4.1.2.5-1…01…Crate Configuration bus
5.4.1.3.3 E̲r̲r̲o̲r̲ ̲R̲e̲p̲o̲r̲t̲i̲n̲g̲
The WD receives:
- status information from the PUs
- "keep alive" messages from PUs
- status of built-in tests TBD
- status from the TDX controller via V24 TBD
Error detection in the WD is based upon communication
(V24/V28) between the WD and both PUs.
Upon detection of a failure, the WD program starts
an audible signal, generates a headline report on the
VDU and a detailed report on the LP if possible.
5.4.1.4 C̲h̲a̲r̲a̲c̲t̲e̲r̲i̲s̲t̲i̲c̲s̲
5.4.1.4.1 P̲e̲r̲f̲o̲r̲m̲a̲n̲c̲e̲
The watchdog transmission speed is:
- WD to PU 9.6 K baud
- WD to CCA 4.8 K baud ref. ED PAM SYSTEM
- WD to VDU 9.6 K baud
The watchdog is built around:
- a Z 80 microprocessor; 8 bit instruction set
- a 32 K RAM; the 32 K RAM is divided in
16 K costumized and 16 K general firmware
- a 16 K EPROM
- a Line interface; 4 x V24/V28 and 1 PAM I/F
Time for the watchdog to isolate a hardware device
is 1 second.
In order to avoid WD CPU failure to perform an unintentional
switching 3 transmissions from the WD via the serial
configuration bus to the CCAs are necessary to load
a control register, which in turn controls switching:
a) Transmit 2 x 11 bit word (pointer) and receive
status.
b) Transmit 2 x 11 bit word (data load) and receive
status.
c) Transmit 2 x 11 bit word (strobe through) receive
status.
Hardware availability. Refer R & M Program Plan CPS/PLN/004
sec. 4.1.6.
5.4.1.4.3 S̲e̲c̲u̲r̲i̲t̲y̲
E̲l̲e̲c̲t̲r̲i̲c̲a̲l̲ ̲S̲e̲c̲u̲r̲i̲t̲y̲
The power supplies in the WD and Channel Unit is dualized.
R̲a̲d̲i̲a̲t̲i̲o̲n̲
The watchdog and PU V24 lines are enclosed within a
tempest shield.
The VDU + keyboard and LP are tempest approved. V24/V28
lines to the VDU and LP are low level V28 signals.
5.4.2 E̲n̲v̲i̲r̲o̲n̲m̲e̲n̲t̲
5.4.2.1 S̲t̲a̲n̲d̲a̲r̲d̲ ̲H̲a̲r̲d̲w̲a̲r̲e̲,̲ ̲F̲i̲r̲m̲w̲a̲r̲e̲ ̲a̲n̲d̲ ̲S̲o̲f̲t̲w̲a̲r̲e̲
N.A.
5.4.2.2. E̲x̲t̲e̲r̲n̲a̲l̲ ̲I̲n̲t̲e̲r̲f̲a̲c̲e̲s̲
VDU and LP at the system engineer position.
