lowRISC / lowRISC/opentitan

[ac_range_check,dv] Move lock range_cg sampling from seq to scoreboard

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#27,352 0 comments 0 reactions 1 assignee View on GitHub

@ysekhar is already working on this.

Since Jun 4, 2025.

Component:DV IP:ac_range_check
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Description

Currently lock_range_cg sampling is done in ac_range_check_lock_range_vseq.

We have an issue in ac_range_check_scoreboard that it drops TLUL write transaction csr range_regwen when range_regwen[i] == 1.

A write to this csr triggers a sampling of the covergroup irrespective of the value being written.

Depends on #27332 to be merged first to progress debug and find the necessary fix

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