For the RTL design of an AHB-APB bridge, you typically need to create modules that interface between the AHB (Advanced High-Performance Bus) and APB (Advanced Peripheral Bus) protocols. Here's a simplified RTL architecture outline:
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AHB Interface Module:
- Implement an AHB interface module that receives AHB transactions from the AHB bus and converts them into APB transactions.
- Translate AHB address, data, and control signals into corresponding APB signals.
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APB Interface Module:
- Implement an APB interface module that interfaces with the APB bus.
- Translate APB transactions into AHB transactions to access the AHB bus.
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Bridge Logic:
- The core of the bridge that manages the conversion of transactions between AHB and APB.
- Ensure proper protocol adherence for both AHB and APB buses.
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Clock Domain Crossing Logic:
- If AHB and APB buses operate in different clock domains, implement clock domain crossing logic to safely transfer data between the domains.
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Test Points:
- Insert test points or registers for monitoring and debugging during verification.
The UVM testbench is responsible for verifying the AHB-APB bridge RTL design. Here's a simplified UVM testbench architecture outline:
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Test Sequence:
- Develop test sequences that describe different test scenarios for the AHB-APB bridge.
- Sequences may include read and write transactions, burst transfers, error scenarios, etc.
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Test Scenario Configuration:
- Create configurations for different test scenarios, allowing flexibility in test parameterization.
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Agent Architecture:
- Implement UVM agents for the AHB and APB interfaces.
- Agents are responsible for driving transactions onto the AHB and APB buses and monitoring the responses.
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Scoreboard:
- Develop a scoreboard to check that the AHB and APB transactions match and that there are no protocol violations.
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Monitor:
- Create monitors for both the AHB and APB interfaces to collect data and protocol information during simulation.
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Drivers and Sequencers:
- Develop drivers to drive transactions onto the AHB and APB buses.
- Implement sequencers to generate sequences of transactions.
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Test Environment:
- Instantiate the AHB-APB bridge RTL design within the testbench environment.
- Connect the UVM agents to the RTL interfaces.
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Testbench Configuration:
- Configure the testbench parameters, such as simulation runtime, verbosity, and coverage options.
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Test Execution:
- Create a test program that orchestrates the execution of test sequences and scenarios.
- Randomize and run the test sequences.
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Reporting and Analysis:
- Collect and analyze the results of the simulation.
- Generate detailed reports and coverage reports.
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Assertions:
- Incorporate assertions to check protocol compliance and detect errors.
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Functional Coverage:
- Develop functional coverage models to ensure that various protocol scenarios are exercised.
Please note that this is a high-level outline, and creating a comprehensive UVM testbench and RTL design for an AHB-APB bridge verification project is a significant undertaking that requires a deep understanding of both the AHB and APB protocols, as well as the UVM methodology. Additionally, you may need to adapt this outline to meet your specific project's requirements and constraints.