fmc_tdc_core: decrease timestamp FIFO size to 512 (so that it fits in the SPEC with WPRC v4.1)

hdl/rtl/timestamp_fifo.vhd

@@ -113,7 +113,7 @@ begin
       regs_i     => regs_in,
       regs_o     => regs_out);
 
-  buf_count <= unsigned(regs_out.fifo_wr_usedw_o);
+  buf_count <= resize(unsigned(regs_out.fifo_wr_usedw_o), 10);
 
   ts_match <= '1' when timestamp_valid_i = '1' and unsigned(timestamp_i(98 downto 96)) = g_channel else '0';
   

hdl/rtl/timestamp_fifo_wb.vhd

@@ -3,7 +3,7 @@
 ---------------------------------------------------------------------------------------
 -- File           : timestamp_fifo_wb.vhd
 -- Author         : auto-generated by wbgen2 from wbgen/timestamp_fifo_wb.wb
--- Created        : Mon Apr 20 17:34:12 2015
+-- Created        : Wed Sep 20 18:41:08 2017
 -- Standard       : VHDL'87
 ---------------------------------------------------------------------------------------
 -- THIS FILE WAS GENERATED BY wbgen2 FROM SOURCE FILE wbgen/timestamp_fifo_wb.wb
@@ -89,26 +89,16 @@ signal tsf_csr_rst_seq_sync2                    : std_logic      ;
 signal tsf_fifo_full_int                        : std_logic      ;
 signal tsf_fifo_empty_int                       : std_logic      ;
 signal tsf_fifo_clear_bus_int                   : std_logic      ;
-signal tsf_fifo_usedw_int                       : std_logic_vector(9 downto 0);
+signal tsf_fifo_usedw_int                       : std_logic_vector(8 downto 0);
 signal ack_sreg                                 : std_logic_vector(9 downto 0);
 signal rddata_reg                               : std_logic_vector(31 downto 0);
 signal wrdata_reg                               : std_logic_vector(31 downto 0);
-signal bwsel_reg                                : std_logic_vector(3 downto 0);
 signal rwaddr_reg                               : std_logic_vector(3 downto 0);
 signal ack_in_progress                          : std_logic      ;
-signal wr_int                                   : std_logic      ;
-signal rd_int                                   : std_logic      ;
-signal allones                                  : std_logic_vector(31 downto 0);
-signal allzeros                                 : std_logic_vector(31 downto 0);
 
 begin
--- Some internal signals assignments. For (foreseen) compatibility with other bus standards.
+-- Some internal signals assignments
   wrdata_reg <= wb_dat_i;
-  bwsel_reg <= wb_sel_i;
-  rd_int <= wb_cyc_i and (wb_stb_i and (not wb_we_i));
-  wr_int <= wb_cyc_i and (wb_stb_i and wb_we_i);
-  allones <= (others => '1');
-  allzeros <= (others => '0');
 -- 
 -- Main register bank access process.
   process (clk_sys_i, rst_n_i)
@@ -310,7 +300,8 @@ begin
             rddata_reg(16) <= tsf_fifo_full_int;
             rddata_reg(17) <= tsf_fifo_empty_int;
             rddata_reg(18) <= '0';
-            rddata_reg(9 downto 0) <= tsf_fifo_usedw_int;
+            rddata_reg(8 downto 0) <= tsf_fifo_usedw_int;
+            rddata_reg(9) <= 'X';
             rddata_reg(10) <= 'X';
             rddata_reg(11) <= 'X';
             rddata_reg(12) <= 'X';
@@ -353,9 +344,9 @@ begin
   tsf_fifo_rst_n <= rst_n_i and (not tsf_fifo_clear_bus_int);
   tsf_fifo_INST : wbgen2_fifo_async
     generic map (
-      g_size               => 1024,
+      g_size               => 512,
       g_width              => 128,
-      g_usedw_size         => 10
+      g_usedw_size         => 9
     )
     port map (
       wr_req_i             => regs_i.fifo_wr_req_i,

hdl/rtl/timestamp_fifo_wbgen2_pkg.vhd

@@ -3,7 +3,7 @@
 ---------------------------------------------------------------------------------------
 -- File           : timestamp_fifo_wbgen2_pkg.vhd
 -- Author         : auto-generated by wbgen2 from wbgen/timestamp_fifo_wb.wb
--- Created        : Mon Apr 20 17:34:12 2015
+-- Created        : Wed Sep 20 18:41:08 2017
 -- Standard       : VHDL'87
 ---------------------------------------------------------------------------------------
 -- THIS FILE WAS GENERATED BY wbgen2 FROM SOURCE FILE wbgen/timestamp_fifo_wb.wb
@@ -51,7 +51,7 @@ package tsf_wbgen2_pkg is
     type t_tsf_out_registers is record
       fifo_wr_full_o                           : std_logic;
       fifo_wr_empty_o                          : std_logic;
-      fifo_wr_usedw_o                          : std_logic_vector(9 downto 0);
+      fifo_wr_usedw_o                          : std_logic_vector(8 downto 0);
       csr_last_valid_o                         : std_logic;
       csr_last_valid_load_o                    : std_logic;
       csr_rst_seq_o                            : std_logic;

hdl/rtl/wbgen/timestamp_fifo_wb.wb

@@ -9,7 +9,7 @@ peripheral {
 	 -- TXTSU shared FIFO
 
 	 fifo_reg {
-			size = 1024; -- or more. We'll see :)
+			size = 512; -- or more. We'll see :)
 			direction = CORE_TO_BUS;
 			prefix = "fifo";
 			name = "Timestamp FIFO";