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[/] [openrisc/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_tt.v] - Blame information for rev 852

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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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
 
// 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 `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                ttmr <= 32'b0;
        else if (ttmr_sel && spr_write)
                ttmr <=  spr_dat_i;
        else if (ttmr[`OR1200_TT_TTMR_IE])
                ttmr[`OR1200_TT_TTMR_IP] <=  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 `OR1200_RST_EVENT rst)
        if (rst == `OR1200_RST_VALUE)
                ttcr <= 32'b0;
        else if (restart)
                ttcr <=  32'b0;
        else if (ttcr_sel && spr_write)
                ttcr <=  spr_dat_i;
        else if (!stop)
                ttcr <=  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	10	unneback	`//////////////////////////////////////////////////////////////////////`
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
45			`// synopsys translate_off`
46			`include "timescale.v"
47			`// synopsys translate_on`
48			`include "or1200_defines.v"
49
50			`module or1200_tt(`
51			`// RISC Internal Interface`
52			`clk, rst, du_stall,`
53			`spr_cs, spr_write, spr_addr, spr_dat_i, spr_dat_o,`
54			`intr`
55			`);`
56
57			`//`
58			`// RISC Internal Interface`
59			`//`
60			`input clk; // Clock`
61			`input rst; // Reset`
62			`input du_stall; // DU stall`
63			`input spr_cs; // SPR CS`
64			`input spr_write; // SPR Write`
65			`input [31:0] spr_addr; // SPR Address`
66			`input [31:0] spr_dat_i; // SPR Write Data`
67			`output [31:0] spr_dat_o; // SPR Read Data`
68			`output intr; // Interrupt output`
69
70			`ifdef OR1200_TT_IMPLEMENTED
71
72			`//`
73			`// TT Mode Register bits (or no register)`
74			`//`
75			`ifdef OR1200_TT_TTMR
76			`reg [31:0] ttmr; // TTMR bits`
77			`else
78			`wire [31:0] ttmr; // No TTMR register`
79			`endif
80
81			`//`
82			`// TT Count Register bits (or no register)`
83			`//`
84			`ifdef OR1200_TT_TTCR
85			`reg [31:0] ttcr; // TTCR bits`
86			`else
87			`wire [31:0] ttcr; // No TTCR register`
88			`endif
89
90			`//`
91			`// Internal wires & regs`
92			`//`
93			`wire ttmr_sel; // TTMR select`
94			`wire ttcr_sel; // TTCR select`
95			`wire match; // Asserted when TTMR[TP]`
96			`// is equal to TTCR[27:0]`
97			`wire restart; // Restart counter when asserted`
98			`wire stop; // Stop counter when asserted`
99			`reg [31:0] spr_dat_o; // SPR data out`
100
101			`//`
102			`// TT registers address decoder`
103			`//`
104			assign ttmr_sel = (spr_cs && (spr_addr[`OR1200_TTOFS_BITS] == `OR1200_TT_OFS_TTMR)) ? 1'b1 : 1'b0;
105			assign ttcr_sel = (spr_cs && (spr_addr[`OR1200_TTOFS_BITS] == `OR1200_TT_OFS_TTCR)) ? 1'b1 : 1'b0;
106
107			`//`
108			`// Write to TTMR or update of TTMR[IP] bit`
109			`//`
110			`ifdef OR1200_TT_TTMR
111	358	julius	always @(posedge clk or `OR1200_RST_EVENT rst)
112			if (rst == `OR1200_RST_VALUE)
113	10	unneback	`ttmr <= 32'b0;`
114			`else if (ttmr_sel && spr_write)`
115	258	julius	`ttmr <= spr_dat_i;`
116	10	unneback	else if (ttmr[`OR1200_TT_TTMR_IE])
117	258	julius	ttmr[`OR1200_TT_TTMR_IP] <= ttmr[`OR1200_TT_TTMR_IP] \| (match & ttmr[`OR1200_TT_TTMR_IE]);
118	10	unneback	`else
119			`assign ttmr = {2'b11, 30'b0}; // TTMR[M] = 0x3`
120			`endif
121
122			`//`
123			`// Write to or increment of TTCR`
124			`//`
125			`ifdef OR1200_TT_TTCR
126	358	julius	always @(posedge clk or `OR1200_RST_EVENT rst)
127			if (rst == `OR1200_RST_VALUE)
128	10	unneback	`ttcr <= 32'b0;`
129			`else if (restart)`
130	258	julius	`ttcr <= 32'b0;`
131	10	unneback	`else if (ttcr_sel && spr_write)`
132	258	julius	`ttcr <= spr_dat_i;`
133	10	unneback	`else if (!stop)`
134	258	julius	`ttcr <= ttcr + 32'd1;`
135	10	unneback	`else
136			`assign ttcr = 32'b0;`
137			`endif
138
139			`//`
140			`// Read TT registers`
141			`//`
142			`always @(spr_addr or ttmr or ttcr)`
143			case (spr_addr[`OR1200_TTOFS_BITS]) // synopsys parallel_case
144			`ifdef OR1200_TT_READREGS
145			`OR1200_TT_OFS_TTMR: spr_dat_o = ttmr;
146			`endif
147			`default: spr_dat_o = ttcr;`
148			`endcase`
149
150			`//`
151			`// A match when TTMR[TP] is equal to TTCR[27:0]`
152			`//`
153			assign match = (ttmr[`OR1200_TT_TTMR_TP] == ttcr[27:0]) ? 1'b1 : 1'b0;
154
155			`//`
156			`// Restart when match and TTMR[M]==0x1`
157			`//`
158			assign restart = match && (ttmr[`OR1200_TT_TTMR_M] == 2'b01);
159
160			`//`
161			`// Stop when match and TTMR[M]==0x2 or when TTMR[M]==0x0 or when RISC is stalled by debug unit`
162			`//`
163			assign stop = match & (ttmr[`OR1200_TT_TTMR_M] == 2'b10) \| (ttmr[`OR1200_TT_TTMR_M] == 2'b00) \| du_stall;
164
165			`//`
166			`// Generate an interrupt request`
167			`//`
168			assign intr = ttmr[`OR1200_TT_TTMR_IP];
169
170			`else
171
172			`//`
173			`// When TT is not implemented, drive all outputs as would when TT is disabled`
174			`//`
175			`assign intr = 1'b0;`
176
177			`//`
178			`// Read TT registers`
179			`//`
180			`ifdef OR1200_TT_READREGS
181			`assign spr_dat_o = 32'b0;`
182			`endif
183
184			`endif
185
186			`endmodule`

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[/] [openrisc/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_tt.v] - Blame information for rev 852