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[/] [or1k/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_tt.v] - Blame information for rev 1778

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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  OR1200's Tick Timer                                         ////
////                                                              ////
////  This file is part of the OpenRISC 1200 project              ////
////  http://www.opencores.org/cores/or1k/                        ////
////                                                              ////
////  Description                                                 ////
////  TT according to OR1K architectural specification.           ////
////                                                              ////
////  To Do:                                                      ////
////   None                                                       ////
////                                                              ////
////  Author(s):                                                  ////
////      - Damjan Lampret, lampret@opencores.org                 ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// 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: not supported by cvs2svn $
// Revision 1.4  2002/03/29 15:16:56  lampret
// Some of the warnings fixed.
//
// Revision 1.3  2002/02/12 01:33:47  lampret
// No longer using async rst as sync reset for the counter.
//
// 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 1.10  2001/11/13 10:00:49  lampret
// Fixed tick timer interrupt reporting by using TTCR[IP] bit.
//
// Revision 1.9  2001/11/10 03:43:57  lampret
// Fixed exceptions.
//
// 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 13:12:10  lampret
// MP3 version.
//
// Revision 1.1.1.1  2001/10/06 10:18:35  igorm
// no message
//
// Revision 1.2  2001/08/09 13:39:33  lampret
// Major clean-up.
//
// Revision 1.1  2001/07/20 00:46:23  lampret
// Development version of RTL. Libraries are missing.
//
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "or1200_defines.v"
 
module or1200_tt(
        // RISC Internal Interface
        clk, rst, du_stall,
        spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o,
        intr
);
 
//
// RISC Internal Interface
//
input           clk;            // Clock
input           rst;            // Reset
input           du_stall;       // DU stall
input           spr_cs;         // SPR CS
input           spr_write;      // SPR Write
input   [31:0]   spr_addr;       // SPR Address
input   [31:0]   spr_dat_i;      // SPR Write Data
output  [31:0]   spr_dat_o;      // SPR Read Data
output          intr;           // Interrupt output
 
`ifdef OR1200_TT_IMPLEMENTED
 
//
// TT Mode Register bits (or no register)
//
`ifdef OR1200_TT_TTMR
reg     [31:0]   ttmr;   // TTMR bits
`else
wire    [31:0]   ttmr;   // No TTMR register
`endif
 
//
// TT Count Register bits (or no register)
//
`ifdef OR1200_TT_TTCR
reg     [31:0]   ttcr;   // TTCR bits
`else
wire    [31:0]   ttcr;   // No TTCR register
`endif
 
//
// Internal wires & regs
//
wire            ttmr_sel;       // TTMR select
wire            ttcr_sel;       // TTCR select
wire            match;          // Asserted when TTMR[TP]
                                // is equal to TTCR[27:0]
wire            restart;        // Restart counter when asserted
wire            stop;           // Stop counter when asserted
reg     [31:0]   spr_dat_o;      // SPR data out
 
//
// TT registers address decoder
//
assign ttmr_sel = (spr_cs && (spr_addr[`OR1200_TTOFS_BITS] == `OR1200_TT_OFS_TTMR)) ? 1'b1 : 1'b0;
assign ttcr_sel = (spr_cs && (spr_addr[`OR1200_TTOFS_BITS] == `OR1200_TT_OFS_TTCR)) ? 1'b1 : 1'b0;
 
//
// Write to TTMR or update of TTMR[IP] bit
//
`ifdef OR1200_TT_TTMR
always @(posedge clk or posedge rst)
        if (rst)
                ttmr <= 32'b0;
        else if (ttmr_sel && spr_write)
                ttmr <= #1 spr_dat_i;
        else if (ttmr[`OR1200_TT_TTMR_IE])
                ttmr[`OR1200_TT_TTMR_IP] <= #1 ttmr[`OR1200_TT_TTMR_IP] | (match & ttmr[`OR1200_TT_TTMR_IE]);
`else
assign ttmr = {2'b11, 30'b0};    // TTMR[M] = 0x3
`endif
 
//
// Write to or increment of TTCR
//
`ifdef OR1200_TT_TTCR
always @(posedge clk or posedge rst)
        if (rst)
                ttcr <= 32'b0;
        else if (restart)
                ttcr <= #1 32'b0;
        else if (ttcr_sel && spr_write)
                ttcr <= #1 spr_dat_i;
        else if (!stop)
                ttcr <= #1 ttcr + 32'd1;
`else
assign ttcr = 32'b0;
`endif
 
//
// Read TT registers
//
always @(spr_addr or ttmr or ttcr)
        case (spr_addr[`OR1200_TTOFS_BITS])     // synopsys parallel_case
`ifdef OR1200_TT_READREGS
                `OR1200_TT_OFS_TTMR: spr_dat_o = ttmr;
`endif
                default: spr_dat_o = ttcr;
        endcase
 
//
// A match when TTMR[TP] is equal to TTCR[27:0]
//
assign match = (ttmr[`OR1200_TT_TTMR_TP] == ttcr[27:0]) ? 1'b1 : 1'b0;
 
//
// Restart when match and TTMR[M]==0x1
//
assign restart = match && (ttmr[`OR1200_TT_TTMR_M] == 2'b01);
 
//
// Stop when match and TTMR[M]==0x2 or when TTMR[M]==0x0 or when RISC is stalled by debug unit
//
assign stop = match & (ttmr[`OR1200_TT_TTMR_M] == 2'b10) | (ttmr[`OR1200_TT_TTMR_M] == 2'b00) | du_stall;
 
//
// Generate an interrupt request
//
assign intr = ttmr[`OR1200_TT_TTMR_IP];
 
`else
 
//
// When TT is not implemented, drive all outputs as would when TT is disabled
//
assign intr = 1'b0;
 
//
// Read TT registers
//
`ifdef OR1200_TT_READREGS
assign spr_dat_o = 32'b0;
`endif
 
`endif
 
endmodule

Line No.	Rev	Author	Line
1	504	lampret	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// OR1200's Tick Timer ////`
4			`//// ////`
5			`//// This file is part of the OpenRISC 1200 project ////`
6			`//// http://www.opencores.org/cores/or1k/ ////`
7			`//// ////`
8			`//// Description ////`
9			`//// TT according to OR1K architectural specification. ////`
10			`//// ////`
11			`//// To Do: ////`
12			`//// None ////`
13			`//// ////`
14			`//// Author(s): ////`
15			`//// - Damjan Lampret, lampret@opencores.org ////`
16			`//// ////`
17			`//////////////////////////////////////////////////////////////////////`
18			`//// ////`
19			`//// Copyright (C) 2000 Authors and OPENCORES.ORG ////`
20			`//// ////`
21			`//// This source file may be used and distributed without ////`
22			`//// restriction provided that this copyright statement is not ////`
23			`//// removed from the file and that any derivative work contains ////`
24			`//// the original copyright notice and the associated disclaimer. ////`
25			`//// ////`
26			`//// This source file is free software; you can redistribute it ////`
27			`//// and/or modify it under the terms of the GNU Lesser General ////`
28			`//// Public License as published by the Free Software Foundation; ////`
29			`//// either version 2.1 of the License, or (at your option) any ////`
30			`//// later version. ////`
31			`//// ////`
32			`//// This source is distributed in the hope that it will be ////`
33			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
34			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
35			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
36			`//// details. ////`
37			`//// ////`
38			`//// You should have received a copy of the GNU Lesser General ////`
39			`//// Public License along with this source; if not, download it ////`
40			`//// from http://www.opencores.org/lgpl.shtml ////`
41			`//// ////`
42			`//////////////////////////////////////////////////////////////////////`
43			`//`
44			`// CVS Revision History`
45			`//`
46			`// $Log: not supported by cvs2svn $`
47	1293	lampret	`// Revision 1.4 2002/03/29 15:16:56 lampret`
48			`// Some of the warnings fixed.`
49			`//`
50	788	lampret	`// Revision 1.3 2002/02/12 01:33:47 lampret`
51			`// No longer using async rst as sync reset for the counter.`
52			`//`
53	663	lampret	`// Revision 1.2 2002/01/28 01:16:00 lampret`
54			`// 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.`
55			`//`
56	617	lampret	`// Revision 1.1 2002/01/03 08:16:15 lampret`
57			`// New prefixes for RTL files, prefixed module names. Updated cache controllers and MMUs.`
58			`//`
59	504	lampret	`// Revision 1.10 2001/11/13 10:00:49 lampret`
60			`// Fixed tick timer interrupt reporting by using TTCR[IP] bit.`
61			`//`
62			`// Revision 1.9 2001/11/10 03:43:57 lampret`
63			`// Fixed exceptions.`
64			`//`
65			`// Revision 1.8 2001/10/21 17:57:16 lampret`
66			`// 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.`
67			`//`
68			`// Revision 1.7 2001/10/14 13:12:10 lampret`
69			`// MP3 version.`
70			`//`
71			`// Revision 1.1.1.1 2001/10/06 10:18:35 igorm`
72			`// no message`
73			`//`
74			`// Revision 1.2 2001/08/09 13:39:33 lampret`
75			`// Major clean-up.`
76			`//`
77			`// Revision 1.1 2001/07/20 00:46:23 lampret`
78			`// Development version of RTL. Libraries are missing.`
79			`//`
80			`//`
81
82			`// synopsys translate_off`
83			`include "timescale.v"
84			`// synopsys translate_on`
85			`include "or1200_defines.v"
86
87			`module or1200_tt(`
88			`// RISC Internal Interface`
89	617	lampret	`clk, rst, du_stall,`
90			`spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o,`
91	1293	lampret	`intr`
92	504	lampret	`);`
93
94			`//`
95			`// RISC Internal Interface`
96			`//`
97			`input clk; // Clock`
98			`input rst; // Reset`
99	617	lampret	`input du_stall; // DU stall`
100	504	lampret	`input spr_cs; // SPR CS`
101			`input spr_write; // SPR Write`
102			`input [31:0] spr_addr; // SPR Address`
103			`input [31:0] spr_dat_i; // SPR Write Data`
104			`output [31:0] spr_dat_o; // SPR Read Data`
105	1293	lampret	`output intr; // Interrupt output`
106	504	lampret
107			`ifdef OR1200_TT_IMPLEMENTED
108
109			`//`
110			`// TT Mode Register bits (or no register)`
111			`//`
112			`ifdef OR1200_TT_TTMR
113			`reg [31:0] ttmr; // TTMR bits`
114			`else
115			`wire [31:0] ttmr; // No TTMR register`
116			`endif
117
118			`//`
119			`// TT Count Register bits (or no register)`
120			`//`
121			`ifdef OR1200_TT_TTCR
122			`reg [31:0] ttcr; // TTCR bits`
123			`else
124			`wire [31:0] ttcr; // No TTCR register`
125			`endif
126
127			`//`
128			`// Internal wires & regs`
129			`//`
130			`wire ttmr_sel; // TTMR select`
131			`wire ttcr_sel; // TTCR select`
132			`wire match; // Asserted when TTMR[TP]`
133			`// is equal to TTCR[27:0]`
134			`wire restart; // Restart counter when asserted`
135			`wire stop; // Stop counter when asserted`
136			`reg [31:0] spr_dat_o; // SPR data out`
137
138			`//`
139			`// TT registers address decoder`
140			`//`
141			assign ttmr_sel = (spr_cs && (spr_addr[`OR1200_TTOFS_BITS] == `OR1200_TT_OFS_TTMR)) ? 1'b1 : 1'b0;
142			assign ttcr_sel = (spr_cs && (spr_addr[`OR1200_TTOFS_BITS] == `OR1200_TT_OFS_TTCR)) ? 1'b1 : 1'b0;
143
144			`//`
145			`// Write to TTMR or update of TTMR[IP] bit`
146			`//`
147			`ifdef OR1200_TT_TTMR
148			`always @(posedge clk or posedge rst)`
149			`if (rst)`
150			`ttmr <= 32'b0;`
151			`else if (ttmr_sel && spr_write)`
152			`ttmr <= #1 spr_dat_i;`
153			else if (ttmr[`OR1200_TT_TTMR_IE])
154			ttmr[`OR1200_TT_TTMR_IP] <= #1 ttmr[`OR1200_TT_TTMR_IP] \| (match & ttmr[`OR1200_TT_TTMR_IE]);
155			`else
156			`assign ttmr = {2'b11, 30'b0}; // TTMR[M] = 0x3`
157			`endif
158
159			`//`
160			`// Write to or increment of TTCR`
161			`//`
162			`ifdef OR1200_TT_TTCR
163			`always @(posedge clk or posedge rst)`
164			`if (rst)`
165			`ttcr <= 32'b0;`
166			`else if (restart)`
167			`ttcr <= #1 32'b0;`
168			`else if (ttcr_sel && spr_write)`
169			`ttcr <= #1 spr_dat_i;`
170			`else if (!stop)`
171	1293	lampret	`ttcr <= #1 ttcr + 32'd1;`
172	504	lampret	`else
173			`assign ttcr = 32'b0;`
174			`endif
175
176			`//`
177			`// Read TT registers`
178			`//`
179			`always @(spr_addr or ttmr or ttcr)`
180	788	lampret	case (spr_addr[`OR1200_TTOFS_BITS]) // synopsys parallel_case
181	504	lampret	`ifdef OR1200_TT_READREGS
182			`OR1200_TT_OFS_TTMR: spr_dat_o = ttmr;
183			`endif
184			`default: spr_dat_o = ttcr;`
185			`endcase`
186
187			`//`
188			`// A match when TTMR[TP] is equal to TTCR[27:0]`
189			`//`
190			assign match = (ttmr[`OR1200_TT_TTMR_TP] == ttcr[27:0]) ? 1'b1 : 1'b0;
191
192			`//`
193	663	lampret	`// Restart when match and TTMR[M]==0x1`
194	504	lampret	`//`
195	663	lampret	assign restart = match && (ttmr[`OR1200_TT_TTMR_M] == 2'b01);
196	504	lampret
197			`//`
198	617	lampret	`// Stop when match and TTMR[M]==0x2 or when TTMR[M]==0x0 or when RISC is stalled by debug unit`
199	504	lampret	`//`
200	617	lampret	assign stop = match & (ttmr[`OR1200_TT_TTMR_M] == 2'b10) \| (ttmr[`OR1200_TT_TTMR_M] == 2'b00) \| du_stall;
201	504	lampret
202			`//`
203			`// Generate an interrupt request`
204			`//`
205	1293	lampret	assign intr = ttmr[`OR1200_TT_TTMR_IP];
206	504	lampret
207			`else
208
209			`//`
210			`// When TT is not implemented, drive all outputs as would when TT is disabled`
211			`//`
212	1293	lampret	`assign intr = 1'b0;`
213	504	lampret
214			`//`
215			`// Read TT registers`
216			`//`
217			`ifdef OR1200_TT_READREGS
218			`assign spr_dat_o = 32'b0;`
219			`endif
220
221			`endif
222
223			`endmodule`

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