[rom_ctrl,lint] Fix AscentLint error about unused bits
The "&{1'b0, ...}" construct doesn't work with AscentLint because it
checks for unused bits after constant propagation has thrown
everything away.
Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
diff --git a/hw/ip/rom_ctrl/rtl/rom_ctrl_scrambled_rom.sv b/hw/ip/rom_ctrl/rtl/rom_ctrl_scrambled_rom.sv
index 848f732..5a926d7 100644
--- a/hw/ip/rom_ctrl/rtl/rom_ctrl_scrambled_rom.sv
+++ b/hw/ip/rom_ctrl/rtl/rom_ctrl_scrambled_rom.sv
@@ -98,7 +98,7 @@
if (Width < 64) begin : gen_unread_keystream
// Ignore top bits of keystream: we just use the bottom Width bits.
logic unused_top_keystream;
- assign unused_top_keystream = &{1'b0, keystream[63:Width]};
+ assign unused_top_keystream = ^keystream[63:Width];
end
// The physical ROM ==========================================================
