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-- $Id: pdp11_vmbox.vhd 641 2015-02-01 22:12:15Z mueller $
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-- $Id: pdp11_vmbox.vhd 677 2015-05-09 21:52:32Z mueller $
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--
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--
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-- Copyright 2006-2011 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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-- Copyright 2006-2015 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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--
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--
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-- This program is free software; you may redistribute and/or modify it under
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-- This program is free software; you may redistribute and/or modify it under
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-- the terms of the GNU General Public License as published by the Free
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-- the terms of the GNU General Public License as published by the Free
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-- Software Foundation, either version 2, or at your option any later version.
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-- Software Foundation, either version 2, or at your option any later version.
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--
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--
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-- Target Devices: generic
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-- Target Devices: generic
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-- Tool versions: ise 8.2-14.7; viv 2014.4; ghdl 0.18-0.31
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-- Tool versions: ise 8.2-14.7; viv 2014.4; ghdl 0.18-0.31
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--
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--
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-- Revision History:
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-- Revision History:
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-- Date Rev Version Comment
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-- Date Rev Version Comment
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-- 2015-04-04 662 1.6.4 atowidth now 6 (was 5) to support ibdr_rprm reset
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-- 2011-11-18 427 1.6.3 now numeric_std clean
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-- 2011-11-18 427 1.6.3 now numeric_std clean
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-- 2010-10-23 335 1.6.2 add r.paddr_iopage, use ib_sel
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-- 2010-10-23 335 1.6.2 add r.paddr_iopage, use ib_sel
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-- 2010-10-22 334 1.6.1 deassert ibus be's at end-cycle; fix rmw logic
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-- 2010-10-22 334 1.6.1 deassert ibus be's at end-cycle; fix rmw logic
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-- 2010-10-17 333 1.6 implement ibus V2 interface
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-- 2010-10-17 333 1.6 implement ibus V2 interface
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-- 2010-06-27 310 1.5 redo ibus driver logic, now ibus driven from flops
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-- 2010-06-27 310 1.5 redo ibus driver logic, now ibus driven from flops
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-- ----------------------------------------------------------------------------
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-- ----------------------------------------------------------------------------
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entity pdp11_vmbox is -- virtual memory
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entity pdp11_vmbox is -- virtual memory
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port (
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port (
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CLK : in slbit; -- clock
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CLK : in slbit; -- clock
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GRESET : in slbit; -- global reset
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GRESET : in slbit; -- general reset
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CRESET : in slbit; -- console reset
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CRESET : in slbit; -- cpu reset
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BRESET : in slbit; -- ibus reset
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BRESET : in slbit; -- bus reset
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CP_ADDR : in cp_addr_type; -- console port address
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CP_ADDR : in cp_addr_type; -- console port address
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VM_CNTL : in vm_cntl_type; -- vm control port
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VM_CNTL : in vm_cntl_type; -- vm control port
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VM_ADDR : in slv16; -- vm address
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VM_ADDR : in slv16; -- vm address
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VM_DIN : in slv16; -- vm data in
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VM_DIN : in slv16; -- vm data in
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VM_STAT : out vm_stat_type; -- vm status port
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VM_STAT : out vm_stat_type; -- vm status port
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end pdp11_vmbox;
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end pdp11_vmbox;
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architecture syn of pdp11_vmbox is
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architecture syn of pdp11_vmbox is
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constant ibaddr_slim : slv16 := slv(to_unsigned(8#177774#,16));
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constant ibaddr_slim : slv16 := slv(to_unsigned(8#177774#,16));
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constant atowidth : natural := 5; -- size of access timeout counter
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constant atowidth : natural := 6; -- size of access timeout counter
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type state_type is (
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type state_type is (
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s_idle, -- s_idle: wait for vm_cntl request
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s_idle, -- s_idle: wait for vm_cntl request
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s_mem_w, -- s_mem_w: check mmu, wait for memory
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s_mem_w, -- s_mem_w: check mmu, wait for memory
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s_ib_w, -- s_ib_w: wait for ibus
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s_ib_w, -- s_ib_w: wait for ibus
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