- FIFO-depth of CMD-FIFO is not hardwired anymore. It's set to top-level FIFO-depth

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git-svn-id: http://moon:8086/svn/vhdl/trunk@592 cc03376c-175c-47c8-b038-4cd826a8556b

lib/SDRAM/ddr_sdr_v1_5/src/sdram_ctrl_frontend64_wb.vhd

@@ -204,7 +204,8 @@ begin
 	Generic map
 	(
 		BL 				=> BL,
-		f_sysclk 		=> f_sysclk
+		f_sysclk 		=> f_sysclk,
+		fifo_depth		=> fifo_depth
 	)
 	Port map
 	(

lib/SDRAM/ddr_sdr_v1_5/src/sdram_ctrl_frontend_wb.vhd

@@ -204,7 +204,8 @@ begin
 	Generic map
 	(
 		BL 				=> BL,
-		f_sysclk 		=> f_sysclk
+		f_sysclk 		=> f_sysclk,
+		fifo_depth		=> fifo_depth
 	)
 	Port map
 	(

lib/SDRAM/ddr_sdr_v1_5/src/sdram_ctrl_top.vhd

@@ -32,7 +32,8 @@ entity sdram_ctrl_top is
 	Generic
 	(
 		BL 				: natural := 2;
-		f_sysclk 		: natural := 100E6
+		f_sysclk 		: natural := 100E6;
+		fifo_depth		: natural := 3
 	);
 	Port
 	(
@@ -96,7 +97,6 @@ architecture rtl of sdram_ctrl_top is
 
 	-- SD command FIFO
 
-	constant CMD_FIFO_ADDR_WIDTH	: positive := 5;	-- lower than 3 won't give sustained throuhput (for sys_clk == sdram_clk)
 	constant CMD_FIFO_DATA_WIDTH	: positive := user_tag_t'length + 4 + mode_word_t'length + col_addr_t'length;
 	signal cmd_fifo_din				: unsigned(CMD_FIFO_DATA_WIDTH-1 downto 0);
 	signal cmd_fifo_dout			: unsigned(CMD_FIFO_DATA_WIDTH-1 downto 0);
@@ -166,7 +166,7 @@ begin
 	inst_sd_cmd_fifo: entity work.fifo_async
 	GENERIC MAP
 	(
-		addr_width			=> CMD_FIFO_ADDR_WIDTH,
+		addr_width			=> fifo_depth,
 		data_width			=> CMD_FIFO_DATA_WIDTH
 	)
 	PORT MAP