Transaction based verification of discrete wavelet transform IP core using wishbone transactor
Verification is major concern in product development life cycle. The number of human hours required writing a test bench and choice of verification approach is the major contributor in the Non Recurring Engineering (NRE) cost. There are too many techniques for verification. Register Transfer level (RTL) verification is too slow. Transaction based verification technique is used for faster verification of any Intellectual Property core. Transaction-based verification allows simulation and debug at the transaction level, in addition to signal or pin level. All possible transaction types between different modules in a system are created and systematically tested. It does not require detailed test benches with large vector. Device under test (DUT) operates at a binary stimulus level(e.g. Zeros and Ones). Test bench includes one model to define the transactions at a high level (e.g. READ) and another model to interpret transaction and translates them into the binary level. DUT is implemented in lower abstraction language like Verilog and test bench is created in higher abstraction language like C++. The Discrete Wavelet Transform’s (DWT) Intellectual Property (IP) core is used as a DUT. DWT is implemented by Lifting scheme based Daubechies 9/7 filter. Lifting scheme has an advantage over conventional convolution method like time complexity of operation. Wishbone transactor is designed for verification of IP core. Whole system is verified on ZeBu emulator. The same Wishbone transactor is used for verification of different Wishbone compatible IP core.
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