-------------------------------------------------------------------------- -- -- Copyright (C) 1993, Peter J. Ashenden -- Mail: Dept. Computer Science -- University of Adelaide, SA 5005, Australia -- e-mail: petera@cs.adelaide.edu.au -- -- This program 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 1, or (at your option) -- any later version. -- -- This program 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 this program; if not, write to the Free Software -- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -- -------------------------------------------------------------------------- -- -- $RCSfile: memory.vhdl,v $ $Revision: 2.1 $ $Date: 1993/10/31 21:09:12 $ -- -------------------------------------------------------------------------- -- -- Entity declaration for memory model -- use work.dlx_types.all, work.mem_types.all; entity memory is generic (mem_size : positive; -- size in bytes (multiple of 4) Tac1 : Time; -- access time 1st cycle (read or write) Tacb : Time; -- access time burst (read or write) Tpd_clk_out : Time; -- clock to output delay tag : string := ""; origin_x, origin_y : real := 0.0); port (phi1, phi2 : in bit; -- 2-phase non-overlapping clocks a : in dlx_address; -- byte address: a(0) is lsb d : inout dlx_word_bus bus; -- bidirectional data bus: d(0) is msb width : in mem_width; -- byte/haldword/word indicator write_enable : in bit; -- selects read or write cycle burst : in bit := '0'; -- indicates more to come in burst -- can be left open -- for non-burst client mem_enable : in bit; -- starts memory cycle ready : out bit); -- status from memory system end memory;