Open this model in VisualSim from the following location:

File->Open File  $VS/doc/Training_Material/Tutorial/WebHelp/Tutorial/Architecture_Exploration/Event_Based_Traffic_Generator/Event_TG_Model.xml

The construction steps of the model are described below:

Step 1

1. Open a new Block Diagram by selecting File > New > Block Diagram.
2. Instantiate the Digital block from Model > Simulator > Digital. Double-click the block and set the "StopTime" parameter as Sim_Time.  The remaining values should be unchanged. (Sim_Time is the name of Model Parameter.)
3. To set up the model parameter in the model, click select Model > Parameter >  Parameter=.
4. Double-click the Parameter=. Enter the parameter name Sim_Time and click OK. Similarly, set the model parameters for the model as shown in figure 1.

 

Figure 1. Event Based Traffic Generator Step 1

Step 2

1. Instantiate the Virtual Machine block from Script_Programming > Script > Virtual_Machine.
2. To add the Block Parameter, double-click the block and add the block parameters such as Start_Time, Mean_Time, Data_Structure, Name_of_Event, Source, Destination, and Size_of_Data_Transferred.
3. To define the script, right-click the block and select Open Block.

Figure 2. Parameters for VM_Traffic

The VM Scripting for the event-based traffic generator is explained below.

Token can be generated

Token                      =   newToken (Data_Structure)

Assign the model parameter to a variable

Mean_Time_            =   Mean_Time

Name_of_Event_      =   Name_of_Event

Hold the traffic source until it reaches Start Time

WAIT (Start_Time)

Token field values are set

Token.ID                  = 1

Token.TIME              = TNow

Token.A_Task_Flag   = true

Token.A_Source        = Source

Token.A_Destination  = Destination

Token.Event_Name    = Name_of_Event_

Token.A_Bytes_Sent  = Bus_Width_Bytes

Token.A_Instruction    = newToken("{100:\"INT\"}")

Token.A_Command     = "Write"

Token.A_Bytes           = Size_of_Data_Transferred

Token.A_Bytes_Remaining = Token.A_Bytes - Bus_Width_Bytes

Send the token to an output port

SEND (output,Token)

Loop the process using while loop

while (true)

Queue all the tokens and triggered out after an user-defined mean time

TIMEQ (Name_of_Event_)

TIMEQ ("Traffic", Token, 0, Mean_Time_)

Token field values are set again after a Mean_Time

(Token.ID).incr()

Token.TIME             = TNow

Token.A_Command  = "Write"

Token.A_Bytes        = Size_of_Data_Transferred

Token.A_Bytes_Remaining = Token.A_Bytes - Bus_Width_Bytes

Send the token to an output port

SEND (output,Token)

Figure 3. Event Based Traffic Generator Step 2

Step 3

1. Instantiate an AXI Bus from Hardware_Modeling > Emerging_Bus_Standard > AMBA_AXI > AXI_Bus.
2. Setup the parameters such as Bus_Name, AXI_Speed_Mhz, AXI_Cycle_Time, Device_Attached_to_Slave_by_Port and Slave_Throttle_Enable. The remaining values should be unchanged. The output port of the Traffic Block is connected to one of the AXI Bus input ports.

Figure 4. Event Based Traffic Generator Step 3

Figure 5. Parameters for AXI_Bus

Step 4

1. Instantiate the DRAM block from Hardware_Modeling > Core_Architecture > DRAM.
2. Set up the parameters for Memory_Name and Memory_Speed_Mhz.  The remaining values should be unchanged. First connect the DRAM output port to one of the output port sof AXI Bus and then connect the AXI to the DRAM input port.

Figure 6. Event Based Traffic Generator Step 4

Figure 7. Parameters for DRAM

Step 5

1. Instantiate the Bridge from Hardware_Modeling > Bus_Switch_Ctrl > Bridge.
2. Set up the parameter such as Bridge_Name and Bridge_Speed_in_Mhz. The remaining values should be unchanged.

 Figure 8. Event Based Traffic Generator Step 5

Figure 9. Parameters for Bridge

Step 6

Instantiate the AXI Bus and DRAM and make a similar set up on block parameters.

1. Instantiate the AXI Bus from Hardware_Modeling > Emerging_Bus_Standard > AMBA_AXI > AXI_Bus.
2. Set up the parameters such as Bus_Name, AXI_Speed_Mhz, AXI_Cycle_Time, Device_Attached_to_Slave_by_Port, and Slave_Throttle_Enable. The remaining values should be unchanged. The output port of the Traffic Block is connected to one of the AXI Bus input ports.
3. Instantiate the DRAM from Hardware_Modeling > Core_Architecture > DRAM.

 

Figure 8. Event Based Traffic Generator Step 6