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SystemVerilog API Overview
Waiting Events
Mentor Verification IP AE AMBA AXI4-Stream User Guide, V10.3
27
April 2014
Waiting Events
Each BFM API has tasks that block the test program code execution until an event has occurred.
The wait_on() task blocks the test program execution until an ACLK or ARESETn signal event
has occurred before proceeding.
The get_packet(), get_transfer() tasks block the test program code execution until a complete
stream packet, or transfer, has occurred.
wait_on()
Example 2-7 shows a BFM test program waiting for the positive edge of the ARESETn signal.
Example 2-7. Test Program Wait for Event
// Block test program execution until the positive edge of the
// ARESETn signal.
bfm.wait_on(AXI4STREAM_RESET_POSEDGE);
get_packet(), get_transfer()
Example 2-8 shows a slave BFM test program using the get_transfer() task to block until it has
received a data stream transfer.
Example 2-8. Slave Test Program get_transfer() Task
// Create a slave transaction.
trans = bfm.create_slave_transaction();
...
// Wait for a data stream transfer to occur.
bfm.get_transfer(trans, 0, last);
Access Transaction Record
Each BFM API has tasks that can access a complete or partially complete Transaction Record.
The set*() and get*() tasks are used in a test program to set and get information from the
transaction record.
Note
The set*() and get*() tasks are not explicitly detailed within each BFM API chapter. The
simple rule for the task name is set_ or get_ followed by the name of the transaction field
to be accessed. Refer to “Transaction Record Fields” on page 24 for transaction field
name details.
- AMBA AXI4-Stream User Guide 1
- Table of Contents 3
- List of Examples 10
- List of Figures 11
- List of Tables 12
- About This User Guide 13
- Supported Simulators 13
- Simulator GCC Requirements 14
- Chapter 1 17
- Mentor VIP Altera Edition 17
- What Is a Transaction? 18
- AXI4-Stream Transactions 19
- Chapter 2 21
- SystemVerilog API Overview 21
- Configuration 22
- Creating Transactions 22
- Transaction Record 23
- Executing Transactions 26
- Waiting Events 27
- Access Transaction Record 27
- Operation Mode 28
- Handshake Delay 29
- Transfer Done 30
- Transaction Done 30
- Chapter 3 31
- SystemVerilog Master BFM 31
- Master BFM Configuration 32
- Master Assertions 34
- SystemVerilog Master API 35
- Returns 36
- Arguments config_name 37
- Chapter 4 43
- SystemVerilog Slave BFM 43
- SystemVerilog Slave API 47
- Chapter 5 55
- SystemVerilog Monitor BFM 55
- SystemVerilog Monitor API 59
- Chapter 6 67
- SystemVerilog Tutorials 67
- Chapter 7 75
- VHDL API Overview 75
- Test Program VHDL 76
- Chapter 8 87
- VHDL Master BFM API 91
- April 2014 100
- Prototype 118
- Arguments 118
- VHDL Master BFM 122
- VHDL Slave BFM 123
- Chapter 9 123
- Slave BFM Configuration 124
- Slave Assertions 125
- VHDL Slave BFM API 126
- Chapter 10 157
- VHDL Monitor BFM 157
- Monitor BFM Configuration 158
- Monitor Assertions 159
- VHDL Monitor BFM API 161
- Chapter 11 181
- VHDL Tutorials 181
- Master BFM Test Program 182
- Verifying a Master DUT 185
- Chapter 12 189
- Running the Qsys Tool 193
- Running a Simulation 195
- ModelSim Simulation 196
- Editing the modelsim.ini File 199
- Questa Simulation 200
- Cadence IES Simulation 200
- Synopsys VCS Simulation 202
- Chapter 13 205
- Assertions 205
- Appendix A 209
- Programs 209
- Appendix B 213
- VHDL Slave BFM Code Example 216
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