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or1200_immu_tlb.v
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//////////////////////////////////////////////////////////////////////
//// ////
//// OR1200's Instruction TLB ////
//// ////
//// This file is part of the OpenRISC 1200 project ////
//// http://www.opencores.org/cores/or1k/ ////
//// ////
//// Description ////
//// Instantiation of ITLB. ////
//// ////
//// To Do: ////
//// - make it smaller and faster ////
//// ////
//// Author(s): ////
//// - Damjan Lampret, [email protected] ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000 Authors and OPENCORES.ORG ////
//// ////
//// This source file may be used and distributed without ////
//// restriction provided that this copyright statement is not ////
//// removed from the file and that any derivative work contains ////
//// the original copyright notice and the associated disclaimer. ////
//// ////
//// This source file is free software; you can redistribute it ////
//// and/or modify it under the terms of the GNU Lesser General ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any ////
//// later version. ////
//// ////
//// This source 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 Lesser General Public License for more ////
//// details. ////
//// ////
//// You should have received a copy of the GNU Lesser General ////
//// Public License along with this source; if not, download it ////
//// from http://www.opencores.org/lgpl.shtml ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: or1200_immu_tlb.v,v $
// Revision 2.0 2010/06/30 11:00:00 ORSoC
// Minor update:
// Bugs fixed, coding style changed.
//
// Revision 1.9 2004/06/08 18:17:36 lampret
// Non-functional changes. Coding style fixes.
//
// Revision 1.8 2004/04/05 08:29:57 lampret
// Merged branch_qmem into main tree.
//
// Revision 1.6.4.1 2003/12/09 11:46:48 simons
// Mbist nameing changed, Artisan ram instance signal names fixed, some synthesis waning fixed.
//
// Revision 1.6 2002/10/28 16:34:32 mohor
// RAMs wrong connected to the BIST scan chain.
//
// Revision 1.5 2002/10/17 20:04:40 lampret
// Added BIST scan. Special VS RAMs need to be used to implement BIST.
//
// Revision 1.4 2002/08/14 06:23:50 lampret
// Disabled ITLB translation when 1) doing access to ITLB SPRs or 2) crossing page. This modification was tested only with parts of IMMU test - remaining test cases needs to be run.
//
// Revision 1.3 2002/02/11 04:33:17 lampret
// Speed optimizations (removed duplicate _cyc_ and _stb_). Fixed D/IMMU cache-inhibit attr.
//
// Revision 1.2 2002/01/28 01:16:00 lampret
// Changed 'void' nop-ops instead of insn[0] to use insn[16]. Debug unit stalls the tick timer. Prepared new flag generation for add and and insns. Blocked DC/IC while they are turned off. Fixed I/D MMU SPRs layout except WAYs. TODO: smart IC invalidate, l.j 2 and TLB ways.
//
// Revision 1.1 2002/01/03 08:16:15 lampret
// New prefixes for RTL files, prefixed module names. Updated cache controllers and MMUs.
//
// Revision 1.8 2001/10/21 17:57:16 lampret
// Removed params from generic_XX.v. Added translate_off/on in sprs.v and id.v. Removed spr_addr from dc.v and ic.v. Fixed CR+LF.
//
// Revision 1.7 2001/10/14 13:12:09 lampret
// MP3 version.
//
// Revision 1.1.1.1 2001/10/06 10:18:36 igorm
// no message
//
//
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "or1200_defines.v"
//
// Insn TLB
//
module or1200_immu_tlb(
// Rst and clk
clk, rst,
// I/F for translation
tlb_en, vaddr, hit, ppn, uxe, sxe, ci,
`ifdef OR1200_BIST
// RAM BIST
mbist_si_i, mbist_so_o, mbist_ctrl_i,
`endif
// SPR access
spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o
);
parameter dw = `OR1200_OPERAND_WIDTH;
parameter aw = `OR1200_OPERAND_WIDTH;
//
// I/O
//
//
// Clock and reset
//
input clk;
input rst;
//
// I/F for translation
//
input tlb_en;
input [aw-1:0] vaddr;
output hit;
output [31:`OR1200_IMMU_PS] ppn;
output uxe;
output sxe;
output ci;
`ifdef OR1200_BIST
//
// RAM BIST
//
input mbist_si_i;
input [`OR1200_MBIST_CTRL_WIDTH - 1:0] mbist_ctrl_i;
output mbist_so_o;
`endif
//
// SPR access
//
input spr_cs;
input spr_write;
input [31:0] spr_addr;
input [31:0] spr_dat_i;
output [31:0] spr_dat_o;
//
// Internal wires and regs
//
wire [`OR1200_ITLB_TAG] vpn;
wire v;
wire [`OR1200_ITLB_INDXW-1:0] tlb_index;
wire tlb_mr_en;
wire tlb_mr_we;
wire [`OR1200_ITLBMRW-1:0] tlb_mr_ram_in;
wire [`OR1200_ITLBMRW-1:0] tlb_mr_ram_out;
wire tlb_tr_en;
wire tlb_tr_we;
wire [`OR1200_ITLBTRW-1:0] tlb_tr_ram_in;
wire [`OR1200_ITLBTRW-1:0] tlb_tr_ram_out;
// BIST
`ifdef OR1200_BIST
wire itlb_mr_ram_si;
wire itlb_mr_ram_so;
wire itlb_tr_ram_si;
wire itlb_tr_ram_so;
`endif
//
// Implemented bits inside match and translate registers
//
// itlbwYmrX: vpn 31-19 v 0
// itlbwYtrX: ppn 31-13 uxe 7 sxe 6
//
// itlb memory width:
// 19 bits for ppn
// 13 bits for vpn
// 1 bit for valid
// 2 bits for protection
// 1 bit for cache inhibit
//
// Enable for Match registers
//
assign tlb_mr_en = tlb_en | (spr_cs & !spr_addr[`OR1200_ITLB_TM_ADDR]);
//
// Write enable for Match registers
//
assign tlb_mr_we = spr_cs & spr_write & !spr_addr[`OR1200_ITLB_TM_ADDR];
//
// Enable for Translate registers
//
assign tlb_tr_en = tlb_en | (spr_cs & spr_addr[`OR1200_ITLB_TM_ADDR]);
//
// Write enable for Translate registers
//
assign tlb_tr_we = spr_cs & spr_write & spr_addr[`OR1200_ITLB_TM_ADDR];
//
// Output to SPRS unit
//
assign spr_dat_o = (!spr_write & !spr_addr[`OR1200_ITLB_TM_ADDR]) ?
{vpn, tlb_index, {`OR1200_ITLB_TAGW-7{1'b0}}, 1'b0, 5'b00000, v} :
(!spr_write & spr_addr[`OR1200_ITLB_TM_ADDR]) ?
{ppn, {`OR1200_IMMU_PS-8{1'b0}}, uxe, sxe, {4{1'b0}}, ci, 1'b0} :
32'h00000000;
//
// Assign outputs from Match registers
//
assign {vpn, v} = tlb_mr_ram_out;
//
// Assign to Match registers inputs
//
assign tlb_mr_ram_in = {spr_dat_i[`OR1200_ITLB_TAG], spr_dat_i[`OR1200_ITLBMR_V_BITS]};
//
// Assign outputs from Translate registers
//
assign {ppn, uxe, sxe, ci} = tlb_tr_ram_out;
//
// Assign to Translate registers inputs
//
assign tlb_tr_ram_in = {spr_dat_i[31:`OR1200_IMMU_PS],
spr_dat_i[`OR1200_ITLBTR_UXE_BITS],
spr_dat_i[`OR1200_ITLBTR_SXE_BITS],
spr_dat_i[`OR1200_ITLBTR_CI_BITS]};
//
// Generate hit
//
assign hit = (vpn == vaddr[`OR1200_ITLB_TAG]) & v;
//
// TLB index is normally vaddr[18:13]. If it is SPR access then index is
// spr_addr[5:0].
//
assign tlb_index = spr_cs ? spr_addr[`OR1200_ITLB_INDXW-1:0] : vaddr[`OR1200_ITLB_INDX];
`ifdef OR1200_BIST
assign itlb_mr_ram_si = mbist_si_i;
assign itlb_tr_ram_si = itlb_mr_ram_so;
assign mbist_so_o = itlb_tr_ram_so;
`endif
//
// Instantiation of ITLB Match Registers
//
or1200_spram #
(
.aw(6),
.dw(14)
)
itlb_mr_ram
(
.clk(clk),
`ifdef OR1200_BIST
// RAM BIST
.mbist_si_i(itlb_mr_ram_si),
.mbist_so_o(itlb_mr_ram_so),
.mbist_ctrl_i(mbist_ctrl_i),
`endif
.ce(tlb_mr_en),
.we(tlb_mr_we),
//.oe(1'b1),
.addr(tlb_index),
.di(tlb_mr_ram_in),
.doq(tlb_mr_ram_out)
);
//
// Instantiation of ITLB Translate Registers
//
or1200_spram #
(
.aw(6),
.dw(22)
)
itlb_tr_ram
(
.clk(clk),
`ifdef OR1200_BIST
// RAM BIST
.mbist_si_i(itlb_tr_ram_si),
.mbist_so_o(itlb_tr_ram_so),
.mbist_ctrl_i(mbist_ctrl_i),
`endif
.ce(tlb_tr_en),
.we(tlb_tr_we),
//.oe(1'b1),
.addr(tlb_index),
.di(tlb_tr_ram_in),
.doq(tlb_tr_ram_out)
);
endmodule