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Diffstat (limited to 'testsuite/vests/vhdl-ams/ashenden/compliant/generators/memory_board.vhd')
-rw-r--r-- | testsuite/vests/vhdl-ams/ashenden/compliant/generators/memory_board.vhd | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/testsuite/vests/vhdl-ams/ashenden/compliant/generators/memory_board.vhd b/testsuite/vests/vhdl-ams/ashenden/compliant/generators/memory_board.vhd new file mode 100644 index 000000000..65a35f181 --- /dev/null +++ b/testsuite/vests/vhdl-ams/ashenden/compliant/generators/memory_board.vhd @@ -0,0 +1,94 @@ + +-- Copyright (C) 2002 Morgan Kaufmann Publishers, Inc + +-- This file is part of VESTs (Vhdl tESTs). + +-- VESTs is free software; you can redistribute it and/or modify it +-- under the terms of the GNU General Public License as published by the +-- Free Software Foundation; either version 2 of the License, or (at +-- your option) any later version. + +-- VESTs is distributed in the hope that it will be useful, but WITHOUT +-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or +-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +-- for more details. + +-- You should have received a copy of the GNU General Public License +-- along with VESTs; if not, write to the Free Software Foundation, +-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + +-- not in book + +library ieee; use ieee.std_logic_1164.all; + +entity DRAM is + port ( a : in std_logic_vector(0 to 10); + d : inout std_logic_vector(0 to 3); + cs, we, ras, cas : in std_logic ); +end entity DRAM; + + +architecture empty of DRAM is +begin + d <= (others => 'Z'); +end architecture empty; + + + +library ieee; use ieee.std_logic_1164.all; + +entity memory_board is +end entity memory_board; + +-- end not in book + + +architecture chip_level of memory_board is + + component DRAM is + port ( a : in std_logic_vector(0 to 10); + d : inout std_logic_vector(0 to 3); + cs, we, ras, cas : in std_logic ); + end component DRAM; + + signal buffered_address : std_logic_vector(0 to 10); + signal DRAM_data : std_logic_vector(0 to 31); + signal bank_select : std_logic_vector(0 to 3); + signal buffered_we, buffered_ras, buffered_cas : std_logic; + + -- . . . -- other declarations + +begin + + bank_array : for bank_index in 0 to 3 generate + begin + + nibble_array : for nibble_index in 0 to 7 generate + + constant data_lo : natural := nibble_index * 4; + constant data_hi : natural := nibble_index * 4 + 3; + + begin + + a_DRAM : component DRAM + port map ( a => buffered_address, + d => DRAM_data(data_lo to data_hi), + cs => bank_select(bank_index), + we => buffered_we, + ras => buffered_ras, + cas => buffered_cas ); + + end generate nibble_array; + + end generate bank_array; + + -- . . . -- other component instances, etc + + -- not in book + + buffered_address <= "01010101010"; + DRAM_data <= X"01234567"; + + -- end not in book + +end architecture chip_level; |