Change frame detection

* Need at least SOP and EOP.
* If any other flag is missing, raise error

hdl/combpm_protocol_electron.vhd

@@ -62,7 +62,7 @@ architecture rtl of combpm_protocol_electron is
     signal flag_rsvd         :  std_logic;
     signal flag_crc          :  std_logic;
     signal flag_all          :  std_logic;
-    signal flag_any          :  std_logic;
+    signal flag_frame        :  std_logic;
 
     signal packet_bpmid      :  std_logic_vector(9 downto 0);
     signal packet_startframe :  std_logic;
@@ -132,7 +132,7 @@ begin
 
     -- Any and all flag
     flag_all            <= flag_sop and flag_eop and flag_dummy and flag_rsvd and flag_crc and gt_interfaceready;
-    flag_any            <= (flag_sop or flag_eop or flag_crc) and gt_interfaceready;
+    flag_frame          <= flag_sop and flag_eop and gt_interfaceready;
 
     ----------------------------
     -- FRAME FIELD EXTRACTION --
@@ -280,7 +280,7 @@ begin
     ------------------------
     -- CONTROL AND STATUS --
     ------------------------
-    frame_error         <= flag_all xor flag_any;
+    frame_error         <= flag_frame and not flag_all;
     frame_valid_cnt     <= std_logic_vector(cnt_valid_r);
     frame_invalid_cnt   <= std_logic_vector(cnt_invalid_r);
     frame_seq_cnt       <= std_logic_vector(last_cnt_seq_r);
@@ -321,7 +321,7 @@ begin
                 end if;
 
                 -- Invalid frame counter
-                if (flag_all xor flag_any) = '1' then
+                if (flag_frame and not flag_all) = '1' then
                     cnt_invalid_r <= cnt_invalid_r+1;
                 end if;
 
@@ -338,7 +338,7 @@ begin
                     end if;
 
                     -- Invalid frame rate counter
-                    if (flag_all xor flag_any) = '1' then
+                    if (flag_frame and not flag_all) = '1' then
                         rate_invalid_r <= rate_invalid_r+1;
                     end if;
                 end if;