[wr_streamers] added generic to set simulation startup timer value

when streamers are used in a simulation of top entity, the startup timer is needed, thought it should be appropriate for the simulation time. when streamers are simulated alone, the startup timer is not needed. the added generic allows to set the timer (i.e. override the default value to zero)

[wr_streamers] added generic to set simulation startup timer value
when streamers are used in a simulation of top entity, the startup timer is needed, thought it should be appropriate for the simulation time. when streamers are simulated alone, the startup timer is not needed. the added generic allows to set the timer (i.e. override the default value to zero)
359052ac · Maciej Lipinski · Grzegorz Daniluk · 2750389f · 359052ac · 359052ac
Commit 359052ac authored May 19, 2017 by Maciej Lipinski Committed by Grzegorz Daniluk Jun 19, 2017
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streamers_pkg.vhd modules/wr_streamers/streamers_pkg.vhd +2 -1

xtx_streamer.vhd modules/wr_streamers/xtx_streamer.vhd +6 -4

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--- a/modules/wr_streamers/streamers_pkg.vhd
+++ b/modules/wr_streamers/streamers_pkg.vhd
@@ -182,7 +182,8 @@ package streamers_pkg is
      g_tx_max_words_per_frame : integer := 256;
      g_tx_timeout             : integer := 1024;
      g_escape_code_disable    : boolean := FALSE;
-      g_simulation             : integer := 0);
+      g_simulation             : integer := 0;
+      g_sim_startup_cnt        : integer := 6250);--100us
    port (
      clk_sys_i        : in  std_logic;
      rst_n_i          : in  std_logic;

--- a/modules/wr_streamers/xtx_streamer.vhd
+++ b/modules/wr_streamers/xtx_streamer.vhd
@@ -74,8 +74,11 @@ entity xtx_streamer is
    -- code. This is justified if only one block of a known number of words is sent/expected
    g_escape_code_disable : boolean := FALSE;

-    -- simulation mode (used for startaup-timer)
-    g_simulation : integer :=0
+    -- simulation mode: it is set to override the startaup-timer, the value with which 
+    -- the timer is overriden is set in the second generic 
+    g_simulation : integer :=0;
+    -- startup counter, used only in simulatin mode (value in 16ns cycles)
+    g_sim_startup_cnt : integer := 6250-- 100us
    );

  port (
@@ -176,8 +179,7 @@ architecture rtl of xtx_streamer is

  signal link_ok_delay_cnt         : unsigned(25 downto 0);
  constant c_link_ok_rst_delay     : unsigned(25 downto 0) := to_unsigned(62500000, 26);-- 1s
-  constant c_link_ok_rst_delay_sim : unsigned(25 downto 0) := to_unsigned(6250    , 26);-- 100us
-
+  constant c_link_ok_rst_delay_sim : unsigned(25 downto 0) := to_unsigned(g_sim_startup_cnt, 26);

 begin  -- rtl