ns2 project in Illinois
ns2 project in Illinois the Host interface is implemented with four tasks: inport,
outport, inmsg and outmsg. Inport receives packets
from the host. If the packet is a control packet, it is sent
to inmsg. If it is an ACK or a NAK, it is sent to ns2 project in Illinois outmsg.
Outport receives packets from outmsg and inmsg and sends
them to the host. Inmsg receives control ns2 project in Illinois packets from inport.
If the packet is not valid, it sends NAK to the host
through outport. If it is valid, it sends ACK to the host
through outport and the new interval to the ns2 project in Illinois motor task.
Outmsg receives speeds from the motor tasks and ACKs
and NAKs from inport. All of them are sent to the host.
The host has three tasks. phost is the main ns2 project in Illinois task and
phostin and phostout are input and output tasks for communication
with their corresponding tasks in the RSS host
interface. The embedded system was implemented in a
PARSYS SN9500 machine, a distributed memory parallel
machine based on Transputers with 8 ns2 project in Illinois processors. In this
machine the task communications are established through a
virtual channel network. RSS tasks were implemented over
4 processors. For simplicity in the case study, host tasks
were also implemented in the same ns2 project in Illinois machine using an extra
processor. According to the methodology, the relevant actionreaction
event couples which demand system responsemust
first be identified. The action events are the periodic
requests for speed-reading from the ns2 project in Illinois motor tasks to the
tacometer task. The reaction events are the arrivals at
outmsg task of ACKs coming from the host in response
to the emission of packets with speed data. A total of 16
kinds of events, one per motor, are considered. The transactions
or sequences of activities to be executed as system
responses to these events include all the ns2 project in Illinois activities executed
from the speed-reading request to the ACK reception from
the host. All 16 transactions considered ns2 project in Illinois in the analysis have
the same structure, as shown in Figure 9, corresponding to
the PDES behavioural model. he real-time constraints of each transaction in the case
study depend on the speed of the corresponding motor. The
deadline of each transaction has the same ns2 project in Illinois value as its period
of execution, as shown in Table 5, where Tra refers to the
transaction index and time is given in milliseconds. At this point, parameters and metrics considered in the
methodology are examined in order to check the temporal
behaviour of the system, give a diagnosis and proceed to
possible design improvements. Load ns2 project in Illinois parameters correspond to the periods of transactions.
Table 6 resumes the rest of the parameters: parameters of
the structural model, parameters of the behavioural model
and parameters of connection between the models. It shows
the mapping of tasks in processors, ns2 project in Illinois the mapping of activities
in the tasks and the number of blocks giving support to
the activities (Nb). Index i refers to transactions and activities
[i,1] are the only ones supported ns2 project in Illinois in various independent
blocks and tasks.