In reply to Pooja Pathak:
$onehot(expression) returns `true (bit 1’b1) if only one bit of the expression is high.
constraint transaction:: req_order {$onehot(req_valid)};
Ben Cohen
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- SVA Handbook 4th Edition, 2016 ISBN 978-1518681448
- Real Chip Design and Verification Using Verilog and VHDL, 2002 isbn 978-1539769712
- A Pragmatic Approach to VMM Adoption 2006 ISBN 0-9705394-9-5
- Using PSL/SUGAR for Formal and Dynamic Verification 2nd Edition, 2004, ISBN 0-9705394-6-0
- Component Design by Example ", 2001 ISBN 0-9705394-0-1
- VHDL Coding Styles and Methodologies, 2nd Edition, 1999 ISBN 0-7923-8474-1
- VHDL Answers to Frequently Asked Questions, 2nd Edition ISBN 0-7923-8115
See Paper: 1) VF Horizons:PAPER: SVA Alternative for Complex Assertions | Verification Academy
2) http://systemverilog.us/vf/SolvingComplexUsersAssertions.pdf