Improved synchronization in case of faults in division and prevented potential cases where a bitflip causes a stall due to

activating a division lane that does not exist.

Author: Maurus Item

src/fpnew_aux_fsm.sv

@@ -154,7 +154,7 @@ module fpnew_aux_fsm #(
   assign in_ready[NUM_INP_REGS] = fsm_in_ready;
 
   // Done when all active lanes are done
-  assign fsm_ready = &(lane_fsm_ready_i | ~held_lane_active);
+  assign fsm_ready = &lane_fsm_ready_i;
 
   // FSM to safely apply and receive data from DIVSQRT unit
   always_comb begin : flag_fsm

src/fpnew_opgroup_multifmt_slice.sv

@@ -477,7 +477,7 @@ or on 16b inputs producing 32b outputs");
       assign local_result         = {(LANE_WIDTH){lane_ext_bit[0]}}; // sign-extend/nan box
       assign lane_status[lane]    = '0;
       assign in_lane_active[lane] = 1'b0; // Lane does not exist, it can never be active
-      assign lane_fsm_ready[lane] = 1'b0; // Lane does not exist, it can not be ready
+      assign lane_fsm_ready[lane] = 1'b1; // Lane does not exist, it is always ready just in case erronous data gets to the FSM in this slot
     end
 
     // Generate result packing depending on float format