[rv_plic] fix Src width mismatch
In the commit 88a861588795ccd2c43603096cd007600412ec2f it removes the
necessity of adding position 0 of the interrupt source, which is
reserved as 'no interrupt'. The interrupt source [0] is tied outside of
the rv_plic by the topgen tool.
@WonHoYoo reported the DC synthesis error if the number of source is set
to the power of two ( issue #6718 ).
While revising the design in the above commit, `rv_plic_target` was
omiited by mistake. This commit addresses the issue and reduces the
`SrcWidth` to `$clot2(NumSrc)`.
Signed-off-by: Eunchan Kim <eunchan@opentitan.org>
diff --git a/hw/ip/rv_plic/rtl/rv_plic_target.sv b/hw/ip/rv_plic/rtl/rv_plic_target.sv
index 55b6381..2447e78 100644
--- a/hw/ip/rv_plic/rtl/rv_plic_target.sv
+++ b/hw/ip/rv_plic/rtl/rv_plic_target.sv
@@ -19,8 +19,8 @@
parameter int MAX_PRIO = 7,
// Local param (Do not change this through parameter
- localparam int SrcWidth = $clog2(N_SOURCE+1), // derived parameter
- localparam int PrioWidth = $clog2(MAX_PRIO+1) // derived parameter
+ localparam int SrcWidth = $clog2(N_SOURCE), // derived parameter
+ localparam int PrioWidth = $clog2(MAX_PRIO+1) // derived parameter
) (
input clk_i,
input rst_ni,
