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- fixed

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git-svn-id: http://moon:8086/svn/vhdl/trunk@1226 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2015-05-25 08:13:37 +00:00
parent 6ea540f7c7
commit 44551d28fd
4 changed files with 6 additions and 34 deletions
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projects/mips_sys/src/sdram_config.vhd
+4 -15
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@@ -27,6 +27,7 @@ USE IEEE.NUMERIC_STD.ALL;
package sdram_config is
constant DATA_RATE_FACTOR : positive := 2; -- DDR => twice part data width
constant PART_DATA_WIDTH : positive := 32; -- External DDR-SDRAM Module data bus width
constant PART_ADDR_WIDTH : positive := 13; -- number of address lines to DDR-SDRAM Device/Module
constant PART_BANK_WIDTH : positive := 2; -- Number of BANK address lines of external DDR-SDRAM
@@ -35,27 +36,15 @@ package sdram_config is
constant PART_DQS_WIDTH : positive := PART_DATA_WIDTH / 8; -- Number of data strobe lines
constant PART_DM_WIDTH : positive := PART_DATA_WIDTH / 8; -- Number of Data Mask Lines
constant BUS_DATA_WIDTH : positive := 2*PART_DATA_WIDTH; -- DDR => twice part data width
constant BUS_DM_WIDTH : positive := 2*PART_DM_WIDTH; -- DDR => twice part data width
constant BUS_DATA_WIDTH : positive := DATA_RATE_FACTOR*PART_DATA_WIDTH; -- DDR => twice part data width
constant BUS_DM_WIDTH : positive := DATA_RATE_FACTOR*PART_DM_WIDTH; -- DDR => twice part data width
constant LMR_REG_BASE : natural := 0;
constant LMR_REG_EXTENDED : natural := 1;
constant LMR_OP_NORMAL : natural := 0;
constant LMR_OP_RES_DLL : natural := 2;
constant LMR_BT_SEQ : natural := 0;
constant LMR_BT_ILVD : natural := 1;
constant LMR_BL2 : natural := 1;
constant LMR_BL4 : natural := 2;
constant LMR_BL8 : natural := 3;
constant LMR_CL2 : natural := 2;
constant LMR_CL3 : natural := 3;
constant LMR_CL2_5 : natural := 6;
-- DDR SDRAM Hardware defined constants
constant BIT_AUTO_PRE : positive := 10; -- bit-position in column address for auto precharge (see Data Sheet)
constant BIT_PRE_ALL : positive := 10; -- bit-position in column address for precharge all (see Data Sheet)
constant ENABLE_PRE_ALL : std_logic := '1';
constant ENABLE_AUTO_PRE : std_logic := '0';
constant LMR_BL_CURR : natural := LMR_BL2;
-- DDR-SDR TIMING constants ------------------------------------------------------------------
-- After REFRESH_CLOCKS a refresh cycle is necessary, 64ms / 8192 = max every 7.8125 us refesh