vhdl: implement bounds checking for strand number

2022-06-06 18:25:27 +02:00 · 2022-06-06 18:25:27 +02:00 · 0f497e76e8
parent fcfa9eb7d0
commit 0f497e76e8
1 changed files with 6 additions and 4 deletions
--- a/vhdl/splink.vhdl
+++ b/vhdl/splink.vhdl
@ -146,10 +146,12 @@ begin
 						-- TODO udp_length, range check with MAX_STRAND_LEN
 						num_pixels <= MAX_STRAND_LEN;

-						-- FIXME bounds check
-						active_strand <= to_integer(unsigned(udp_data));
-
-						receive_state <= FRAME_NUM;
+						if unsigned(udp_data) >= NUM_STRANDS then
+							receive_state <= DROP;
+						else
+							active_strand <= to_integer(unsigned(udp_data));
+							receive_state <= FRAME_NUM;
+						end if;

 					when FRAME_NUM =>
 						if not some_strands_written then