LX master: RX CRC error is updated is status register in the same clock as seq. num.

If update is not at the same time then false RX done can be detected
by firmware which does not mask compare result sequence
number bits only.

Signed-off-by: Pavel Pisa <ppisa@pikron.com>

diff --git a/hw/bus_lxmaster.vhd b/hw/bus_lxmaster.vhd
index f4430279819664a618017a8ccab496c42b5213ce..172f0cb0739b700fd48174a36f4042e9051c8d77 100644 (file)
--- a/hw/bus_lxmaster.vhd
+++ b/hw/bus_lxmaster.vhd
@@ -79,6 +79,7 @@ architecture Behavioral of bus_lxmaster is
        signal rx_done_cnt_r        : natural range 0 to (2**rx_done_cnt_width_c - 1);
        --
        signal rx_crc_error_s       : std_logic;
+       signal rx_crc_error_r       : std_logic;
 begin
 
 master_transmitter: lxmaster_transmitter
@@ -158,7 +159,7 @@ rx_done_divider : cnt_div
 wire_in:
        process(ce_i, ce_r, reset_reg_r, bls_i, address_i, mem_trans_data_s,
                mem_recv_data_s, data_i, register_trans_out_s, register_recv_out_s,
-               register_cycle_out_s, rx_done_ratio_r, rx_done_cnt_r, rx_crc_error_s)
+               register_cycle_out_s, rx_done_ratio_r, rx_done_cnt_r, rx_crc_error_r)
        begin
 
                mem_trans_en_s       <= '0';
@@ -265,7 +266,7 @@ wire_in:
                                                        state_o_s(7 downto rx_done_cnt_width_c) <= (others => '0');
                                                        state_o_s(rx_done_div_width_c + 8 - 1 downto 8) <= rx_done_ratio_r;
                                                        state_o_s(14 downto rx_done_div_width_c + 8) <= (others => '0');
-                                                       state_o_s(15) <= rx_crc_error_s;
+                                                       state_o_s(15) <= rx_crc_error_r;
                                                end if;
                                        end if;
 
@@ -317,8 +318,10 @@ update:
 
                if reset_i = '1' then
                        rx_done_cnt_r <= 0;
+                       rx_crc_error_r <= '0';
                elsif rx_done_s = '1' then
                        rx_done_cnt_r <= rx_done_cnt_r + 1;
+                       rx_crc_error_r <= rx_crc_error_s;
                end if;
 
        end process;