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[rtl] Document lockstep reset generation mechanism

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Signed-off-by: Pirmin Vogel <vogelpi@lowrisc.org>
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Pirmin Vogel 2022-01-07 14:15:41 +01:00
parent a5c55f132e
commit 8c01488624
1 changed files with 6 additions and 0 deletions
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6
rtl/ibex_lockstep.sv
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@ -108,6 +108,12 @@ module ibex_lockstep import ibex_pkg::*; #(
// Reset generation //
//////////////////////
// Upon reset, the comparison is stopped and the shadow core is reset, both immediately. A
// counter is started. After LockstepOffset clock cycles:
// - The counter is stopped.
// - The reset of the shadow core is synchronously released.
// The comparison is started in the following clock cycle.
logic [LockstepOffsetW-1:0] rst_shadow_cnt_d, rst_shadow_cnt_q;
// Internally generated resets cause IMPERFECTSCH warnings
/* verilator lint_off IMPERFECTSCH */