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[/] [gpio/] [tags/] [rel_9/] [rtl/] [verilog/] [gpio_top.v] - Blame information for rev 20

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//////////////////////////////////////////////////////////////////////
////                                                              ////
////  WISHBONE General-Purpose I/O                                ////
////                                                              ////
////  This file is part of the GPIO project                       ////
////  http://www.opencores.org/cores/gpio/                        ////
////                                                              ////
////  Description                                                 ////
////  Implementation of GPIO IP core according to                 ////
////  GPIO IP core specification document.                        ////
////                                                              ////
////  To Do:                                                      ////
////   Nothing                                                    ////
////                                                              ////
////  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  2001/12/12 07:12:58  lampret
// Fixed bug when wb_inta_o is registered (GPIO_WB_REGISTERED_OUTPUTS)
//
// Revision 1.3  2001/11/15 02:24:37  lampret
// Added GPIO_REGISTERED_WB_OUTPUTS, GPIO_REGISTERED_IO_OUTPUTS and GPIO_NO_NEGEDGE_FLOPS.
//
// Revision 1.2  2001/10/31 02:26:51  lampret
// Fixed wb_err_o.
//
// Revision 1.1  2001/09/18 18:49:07  lampret
// Changed top level ptc into gpio_top. Changed defines.v into gpio_defines.v.
//
// Revision 1.1  2001/08/21 21:39:28  lampret
// Changed directory structure, port names and drfines.
//
// Revision 1.2  2001/07/14 20:39:26  lampret
// Better configurability.
//
// Revision 1.1  2001/06/05 07:45:26  lampret
// Added initial RTL and test benches. There are still some issues with these files.
//
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "gpio_defines.v"
 
module gpio_top(
        // WISHBONE Interface
        wb_clk_i, wb_rst_i, wb_cyc_i, wb_adr_i, wb_dat_i, wb_sel_i, wb_we_i, wb_stb_i,
        wb_dat_o, wb_ack_o, wb_err_o, wb_inta_o,
 
        // Auxiliary inputs interface
        aux_i,
 
        // External GPIO Interface
        in_pad_i, ext_clk_pad_i, out_pad_o, oen_padoen_o
);
 
parameter dw = 32;
parameter aw = `GPIO_ADDRHH+1;
parameter gw = `GPIO_IOS;
 
//
// WISHBONE Interface
//
input                   wb_clk_i;       // Clock
input                   wb_rst_i;       // Reset
input                   wb_cyc_i;       // cycle valid input
input   [aw-1:0] wb_adr_i;       // address bus inputs
input   [dw-1:0] wb_dat_i;       // input data bus
input   [3:0]            wb_sel_i;       // byte select inputs
input                   wb_we_i;        // indicates write transfer
input                   wb_stb_i;       // strobe input
output  [dw-1:0] wb_dat_o;       // output data bus
output                  wb_ack_o;       // normal termination
output                  wb_err_o;       // termination w/ error
output                  wb_inta_o;      // Interrupt request output
 
// Auxiliary Inputs Interface
input   [gw-1:0] aux_i;          // Auxiliary inputs
 
//
// External GPIO Interface
//
input   [gw-1:0] in_pad_i;       // GPIO Inputs
input                   ext_clk_pad_i;  // GPIO Eclk
output  [gw-1:0] out_pad_o;      // GPIO Outputs
output  [gw-1:0] oen_padoen_o;   // GPIO output drivers enables
 
`ifdef GPIO_IMPLEMENTED
 
//
// GPIO Input Register (or no register)
//
`ifdef GPIO_RGPIO_IN
reg     [gw-1:0] rgpio_in;       // RGPIO_IN register
`else
wire    [gw-1:0] rgpio_in;       // No register
`endif
 
//
// GPIO Output Register (or no register)
//
`ifdef GPIO_RGPIO_OUT
reg     [gw-1:0] rgpio_out;      // RGPIO_OUT register
`else
wire    [gw-1:0] rgpio_out;      // No register
`endif
 
//
// GPIO Output Driver Enable Register (or no register)
//
`ifdef GPIO_RGPIO_OE
reg     [gw-1:0] rgpio_oe;       // RGPIO_OE register
`else
wire    [gw-1:0] rgpio_oe;       // No register
`endif
 
//
// GPIO Interrupt Enable Register (or no register)
//
`ifdef GPIO_RGPIO_INTE
reg     [gw-1:0] rgpio_inte;     // RGPIO_INTE register
`else
wire    [gw-1:0] rgpio_inte;     // No register
`endif
 
//
// GPIO Positive edge Triggered Register (or no register)
//
`ifdef GPIO_RGPIO_PTRIG
reg     [gw-1:0] rgpio_ptrig;    // RGPIO_PTRIG register
`else
wire    [gw-1:0] rgpio_ptrig;    // No register
`endif
 
//
// GPIO Auxiliary select Register (or no register)
//
`ifdef GPIO_RGPIO_AUX
reg     [gw-1:0] rgpio_aux;      // RGPIO_AUX register
`else
wire    [gw-1:0] rgpio_aux;      // No register
`endif
 
//
// GPIO Control Register (or no register)
//
`ifdef GPIO_RGPIO_CTRL
reg     [3:0]            rgpio_ctrl;     // RGPIO_CTRL register
`else
wire    [3:0]            rgpio_ctrl;     // No register
`endif
 
//
// Internal wires & regs
//
wire                    rgpio_out_sel;  // RGPIO_OUT select
wire                    rgpio_oe_sel;   // RGPIO_OE select
wire                    rgpio_inte_sel; // RGPIO_INTE select
wire                    rgpio_ptrig_sel;// RGPIO_PTRIG select
wire                    rgpio_aux_sel;  // RGPIO_AUX select
wire                    rgpio_ctrl_sel; // RGPIO_CTRL select
wire                    latch_clk;      // Latch clock
wire                    full_decoding;  // Full address decoding qualification
wire    [gw-1:0] in_muxed;       // Muxed inputs
wire                    wb_ack;         // WB Acknowledge
wire                    wb_err;         // WB Error
wire                    wb_inta;        // WB Interrupt
reg     [dw-1:0] wb_dat;         // WB Data out
`ifdef GPIO_REGISTERED_WB_OUTPUTS
reg                     wb_ack_o;       // WB Acknowledge
reg                     wb_err_o;       // WB Error
reg                     wb_inta_o;      // WB Interrupt
reg     [dw-1:0] wb_dat_o;       // WB Data out
`endif
wire    [gw-1:0] out_pad;        // GPIO Outputs
`ifdef GPIO_REGISTERED_IO_OUTPUTS
reg     [gw-1:0] out_pad_o;      // GPIO Outputs
`endif
wire    [gw-1:0] extc_in;        // Muxed inputs sampled by external clock
wire                    pext_clk;       // External clock for posedge flops
reg     [gw-1:0] pextc_sampled;  // Posedge external clock sampled inputs
`ifdef GPIO_NO_NEGEDGE_FLOPS
`else
reg     [gw-1:0] nextc_sampled;  // Negedge external clock sampled inputs
`endif
 
//
// All WISHBONE transfer terminations are successful except when:
// a) full address decoding is enabled and address doesn't match
//    any of the GPIO registers
// b) wb_sel_i evaluation is enabled and one of the wb_sel_i inputs is zero
//
 
//
// WB Acknowledge
//
assign wb_ack = wb_cyc_i & wb_stb_i & !wb_err_o;
 
//
// Optional registration of WB Ack
//
`ifdef GPIO_REGISTERED_WB_OUTPUTS
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                wb_ack_o <= #1 1'b0;
        else
                wb_ack_o <= #1 wb_ack;
`else
assign wb_ack_o = wb_ack;
`endif
 
//
// WB Error
//
`ifdef GPIO_FULL_DECODE
`ifdef GPIO_STRICT_32BIT_ACCESS
assign wb_err = wb_cyc_i & wb_stb_i & (!full_decoding | (wb_sel_i != 4'b1111));
`else
assign wb_err = wb_cyc_i & wb_stb_i & !full_decoding;
`endif
`else
`ifdef GPIO_STRICT_32BIT_ACCESS
assign wb_err = wb_cyc_i & wb_stb_i & (wb_sel_i != 4'b1111);
`else
assign wb_err = 1'b0;
`endif
`endif
 
//
// Optional registration of WB error
//
`ifdef GPIO_REGISTERED_WB_OUTPUTS
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                wb_err_o <= #1 1'b0;
        else
                wb_err_o <= #1 wb_err;
`else
assign wb_err_o = wb_err;
`endif
 
//
// Full address decoder
//
`ifdef GPIO_FULL_DECODE
assign full_decoding = (wb_adr_i[`GPIO_ADDRHH:`GPIO_ADDRHL] == {`GPIO_ADDRHH-`GPIO_ADDRHL+1{1'b0}}) &
                        (wb_adr_i[`GPIO_ADDRLH:`GPIO_ADDRLL] == {`GPIO_ADDRLH-`GPIO_ADDRLL+1{1'b0}});
`else
assign full_decoding = 1'b1;
`endif
 
//
// GPIO registers address decoder
//
assign rgpio_out_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_OUT) & full_decoding;
assign rgpio_oe_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_OE) & full_decoding;
assign rgpio_inte_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_INTE) & full_decoding;
assign rgpio_ptrig_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_PTRIG) & full_decoding;
assign rgpio_aux_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_AUX) & full_decoding;
assign rgpio_ctrl_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_CTRL) & full_decoding;
 
//
// Write to RGPIO_CTRL or update of RGPIO_CTRL[INT] bit
//
`ifdef GPIO_RGPIO_CTRL
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                rgpio_ctrl <= #1 4'b0;
        else if (rgpio_ctrl_sel && wb_we_i)
                rgpio_ctrl <= #1 wb_dat_i[3:0];
        else if (rgpio_ctrl[`GPIO_RGPIO_CTRL_INTE])
                rgpio_ctrl[`GPIO_RGPIO_CTRL_INT] <= #1 rgpio_ctrl[`GPIO_RGPIO_CTRL_INT] | wb_inta_o;
`else
assign rgpio_ctrl = 4'h01;      // RGPIO_CTRL[EN] = 1
`endif
 
//
// Write to RGPIO_OUT
//
`ifdef GPIO_RGPIO_OUT
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                rgpio_out <= #1 {gw{1'b0}};
        else if (rgpio_out_sel && wb_we_i)
                rgpio_out <= #1 wb_dat_i[gw-1:0];
`else
assign rgpio_out = `GPIO_DEF_RGPIO_OUT; // RGPIO_OUT = 0x0
`endif
 
//
// Write to RGPIO_OE. Bits in RGPIO_OE are stored inverted.
//
`ifdef GPIO_RGPIO_OE
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                rgpio_oe <= #1 {gw{1'b0}};
        else if (rgpio_oe_sel && wb_we_i)
                rgpio_oe <= #1 ~wb_dat_i[gw-1:0];
`else
assign rgpio_oe = `GPIO_DEF_RPGIO_OE;   // RGPIO_OE = 0x0
`endif
 
//
// Write to RGPIO_INTE
//
`ifdef GPIO_RGPIO_INTE
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                rgpio_inte <= #1 {gw{1'b0}};
        else if (rgpio_inte_sel && wb_we_i)
                rgpio_inte <= #1 wb_dat_i[gw-1:0];
`else
assign rgpio_inte = `GPIO_DEF_RPGIO_INTE;       // RGPIO_INTE = 0x0
`endif
 
//
// Write to RGPIO_PTRIG
//
`ifdef GPIO_RGPIO_PTRIG
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                rgpio_ptrig <= #1 {gw{1'b0}};
        else if (rgpio_ptrig_sel && wb_we_i)
                rgpio_ptrig <= #1 wb_dat_i[gw-1:0];
`else
assign rgpio_ptrig = `GPIO_DEF_RPGIO_PTRIG;     // RGPIO_PTRIG = 0x0
`endif
 
//
// Write to RGPIO_AUX
//
`ifdef GPIO_RGPIO_AUX
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                rgpio_aux <= #1 {gw{1'b0}};
        else if (rgpio_aux_sel && wb_we_i)
                rgpio_aux <= #1 wb_dat_i[gw-1:0];
`else
assign rgpio_aux = `GPIO_DEF_RPGIO_AUX; // RGPIO_AUX = 0x0
`endif
 
//
// Latch into RGPIO_IN
//
`ifdef GPIO_RGPIO_IN
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                rgpio_in <= #1 {gw{1'b0}};
        else
                rgpio_in <= #1 in_muxed;
`else
assign rgpio_in = in_muxed;
`endif
 
//
// Mux inputs directly from input pads with inputs sampled by external clock
//
assign in_muxed = rgpio_ctrl[`GPIO_RGPIO_CTRL_ECLK] ? extc_in : in_pad_i;
 
//
// Posedge pext_clk is inverted by NEC bit if negedge flops are not allowed.
// If negedge flops are allowed, pext_clk only clocks posedge flops.
//
`ifdef GPIO_NO_NEGEDGE_FLOPS
assign pext_clk = rgpio_ctrl[`GPIO_RGPIO_CTRL_NEC] ? ~ext_clk_pad_i : ext_clk_pad_i;
`else
assign pext_clk = ext_clk_pad_i;
`endif
 
//
// If negedge flops are allowed, ext_in is mux of negedge and posedge external clocked flops.
//
`ifdef GPIO_NO_NEGEDGE_FLOPS
assign extc_in = pextc_sampled;
`else
assign extc_in = rgpio_ctrl[`GPIO_RGPIO_CTRL_NEC] ? nextc_sampled : pextc_sampled;
`endif
 
//
// Latch using posedge external clock
//
always @(posedge pext_clk or posedge wb_rst_i)
        if (wb_rst_i)
                pextc_sampled <= #1 {gw{1'b0}};
        else
                pextc_sampled <= #1 in_pad_i;
 
//
// Latch using negedge external clock
//
`ifdef GPIO_NO_NEGEDGE_FLOPS
`else
always @(negedge ext_clk_pad_i or posedge wb_rst_i)
        if (wb_rst_i)
                nextc_sampled <= #1 {gw{1'b0}};
        else
                nextc_sampled <= #1 in_pad_i;
`endif
 
//
// Mux all registers when doing a read of GPIO registers
//
always @(wb_adr_i or rgpio_in or rgpio_out or rgpio_oe or rgpio_inte or
                rgpio_ptrig or rgpio_aux or rgpio_ctrl)
        case (wb_adr_i[`GPIO_OFS_BITS]) // synopsys full_case parallel_case
`ifdef GPIO_READREGS
                `GPIO_RGPIO_OUT: begin
                        wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_out};
                end
                `GPIO_RGPIO_OE: begin
                        wb_dat[dw-1:0] = {{dw-gw{1'b0}}, ~rgpio_oe};
                end
                `GPIO_RGPIO_INTE: begin
                        wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_inte};
                end
                `GPIO_RGPIO_PTRIG: begin
                        wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_ptrig};
                end
                `GPIO_RGPIO_AUX: begin
                        wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_aux};
                end
                `GPIO_RGPIO_CTRL: begin
                        wb_dat[3:0] = rgpio_ctrl;
                        wb_dat[dw-1:4] = {dw-4{1'b0}};
                end
`endif
                default: begin
                        wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_in};
                end
        endcase
 
//
// WB data output
//
`ifdef GPIO_REGISTERED_WB_OUTPUTS
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                wb_dat_o <= #1 {dw{1'b0}};
        else
                wb_dat_o <= #1 wb_dat;
`else
assign wb_dat_o = wb_dat;
`endif
 
//
// Generate interrupt request
//
assign wb_inta = ((in_pad_i ^ ~rgpio_ptrig) & rgpio_inte) ? rgpio_ctrl[`GPIO_RGPIO_CTRL_INTE] : 1'b0;
 
//
// Optional registration of WB interrupt
//
`ifdef GPIO_REGISTERED_WB_OUTPUTS
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                wb_inta_o <= #1 1'b0;
        else
                wb_inta_o <= #1 wb_inta;
`else
assign wb_inta_o = wb_inta;
`endif
 
//
// Output enables are RGPIO_OE bits
//
assign oen_padoen_o = rgpio_oe;
 
//
// Generate GPIO outputs
//
assign out_pad = rgpio_out & ~rgpio_aux | aux_i & rgpio_aux;
 
//
// Optional registration of GPIO outputs
//
`ifdef GPIO_REGISTERED_IO_OUTPUTS
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                out_pad_o <= #1 {gw{1'b0}};
        else
                out_pad_o <= #1 out_pad;
`else
assign out_pad_o = out_pad;
`endif
 
`else
 
//
// When GPIO is not implemented, drive all outputs as would when RGPIO_CTRL
// is cleared and WISHBONE transfers complete with errors
//
assign wb_inta_o = 1'b0;
assign wb_ack_o = 1'b0;
assign wb_err_o = wb_cyc_i & wb_stb_i;
assign oen_padoen_o = {gw{1'b1}};
assign out_pad_o = {gw{1'b0}};
 
//
// Read GPIO registers
//
assign wb_dat_o = {dw{1'b0}};
 
`endif
 
endmodule

Line No.	Rev	Author	Line
1	14	lampret	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// WISHBONE General-Purpose I/O ////`
4			`//// ////`
5			`//// This file is part of the GPIO project ////`
6			`//// http://www.opencores.org/cores/gpio/ ////`
7			`//// ////`
8			`//// Description ////`
9			`//// Implementation of GPIO IP core according to ////`
10			`//// GPIO IP core specification document. ////`
11			`//// ////`
12			`//// To Do: ////`
13			`//// Nothing ////`
14			`//// ////`
15			`//// Author(s): ////`
16			`//// - Damjan Lampret, lampret@opencores.org ////`
17			`//// ////`
18			`//////////////////////////////////////////////////////////////////////`
19			`//// ////`
20			`//// Copyright (C) 2000 Authors and OPENCORES.ORG ////`
21			`//// ////`
22			`//// This source file may be used and distributed without ////`
23			`//// restriction provided that this copyright statement is not ////`
24			`//// removed from the file and that any derivative work contains ////`
25			`//// the original copyright notice and the associated disclaimer. ////`
26			`//// ////`
27			`//// This source file is free software; you can redistribute it ////`
28			`//// and/or modify it under the terms of the GNU Lesser General ////`
29			`//// Public License as published by the Free Software Foundation; ////`
30			`//// either version 2.1 of the License, or (at your option) any ////`
31			`//// later version. ////`
32			`//// ////`
33			`//// This source is distributed in the hope that it will be ////`
34			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
35			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
36			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
37			`//// details. ////`
38			`//// ////`
39			`//// You should have received a copy of the GNU Lesser General ////`
40			`//// Public License along with this source; if not, download it ////`
41			`//// from http://www.opencores.org/lgpl.shtml ////`
42			`//// ////`
43			`//////////////////////////////////////////////////////////////////////`
44			`//`
45			`// CVS Revision History`
46			`//`
47			`// $Log: not supported by cvs2svn $`
48	20	lampret	`// Revision 1.4 2001/12/12 07:12:58 lampret`
49			`// Fixed bug when wb_inta_o is registered (GPIO_WB_REGISTERED_OUTPUTS)`
50			`//`
51	19	lampret	`// Revision 1.3 2001/11/15 02:24:37 lampret`
52			`// Added GPIO_REGISTERED_WB_OUTPUTS, GPIO_REGISTERED_IO_OUTPUTS and GPIO_NO_NEGEDGE_FLOPS.`
53			`//`
54	17	lampret	`// Revision 1.2 2001/10/31 02:26:51 lampret`
55			`// Fixed wb_err_o.`
56			`//`
57	15	lampret	`// Revision 1.1 2001/09/18 18:49:07 lampret`
58			`// Changed top level ptc into gpio_top. Changed defines.v into gpio_defines.v.`
59			`//`
60	14	lampret	`// Revision 1.1 2001/08/21 21:39:28 lampret`
61			`// Changed directory structure, port names and drfines.`
62			`//`
63			`// Revision 1.2 2001/07/14 20:39:26 lampret`
64			`// Better configurability.`
65			`//`
66			`// Revision 1.1 2001/06/05 07:45:26 lampret`
67			`// Added initial RTL and test benches. There are still some issues with these files.`
68			`//`
69			`//`
70
71			`// synopsys translate_off`
72			`include "timescale.v"
73			`// synopsys translate_on`
74			`include "gpio_defines.v"
75
76			`module gpio_top(`
77			`// WISHBONE Interface`
78			`wb_clk_i, wb_rst_i, wb_cyc_i, wb_adr_i, wb_dat_i, wb_sel_i, wb_we_i, wb_stb_i,`
79			`wb_dat_o, wb_ack_o, wb_err_o, wb_inta_o,`
80
81			`// Auxiliary inputs interface`
82			`aux_i,`
83
84			`// External GPIO Interface`
85			`in_pad_i, ext_clk_pad_i, out_pad_o, oen_padoen_o`
86			`);`
87
88			`parameter dw = 32;`
89			parameter aw = `GPIO_ADDRHH+1;
90			parameter gw = `GPIO_IOS;
91
92			`//`
93			`// WISHBONE Interface`
94			`//`
95			`input wb_clk_i; // Clock`
96			`input wb_rst_i; // Reset`
97			`input wb_cyc_i; // cycle valid input`
98			`input [aw-1:0] wb_adr_i; // address bus inputs`
99			`input [dw-1:0] wb_dat_i; // input data bus`
100			`input [3:0] wb_sel_i; // byte select inputs`
101			`input wb_we_i; // indicates write transfer`
102			`input wb_stb_i; // strobe input`
103			`output [dw-1:0] wb_dat_o; // output data bus`
104			`output wb_ack_o; // normal termination`
105			`output wb_err_o; // termination w/ error`
106			`output wb_inta_o; // Interrupt request output`
107
108			`// Auxiliary Inputs Interface`
109			`input [gw-1:0] aux_i; // Auxiliary inputs`
110
111			`//`
112			`// External GPIO Interface`
113			`//`
114			`input [gw-1:0] in_pad_i; // GPIO Inputs`
115			`input ext_clk_pad_i; // GPIO Eclk`
116			`output [gw-1:0] out_pad_o; // GPIO Outputs`
117			`output [gw-1:0] oen_padoen_o; // GPIO output drivers enables`
118
119			`ifdef GPIO_IMPLEMENTED
120
121			`//`
122			`// GPIO Input Register (or no register)`
123			`//`
124			`ifdef GPIO_RGPIO_IN
125			`reg [gw-1:0] rgpio_in; // RGPIO_IN register`
126			`else
127			`wire [gw-1:0] rgpio_in; // No register`
128			`endif
129
130			`//`
131			`// GPIO Output Register (or no register)`
132			`//`
133			`ifdef GPIO_RGPIO_OUT
134			`reg [gw-1:0] rgpio_out; // RGPIO_OUT register`
135			`else
136			`wire [gw-1:0] rgpio_out; // No register`
137			`endif
138
139			`//`
140			`// GPIO Output Driver Enable Register (or no register)`
141			`//`
142			`ifdef GPIO_RGPIO_OE
143			`reg [gw-1:0] rgpio_oe; // RGPIO_OE register`
144			`else
145			`wire [gw-1:0] rgpio_oe; // No register`
146			`endif
147
148			`//`
149			`// GPIO Interrupt Enable Register (or no register)`
150			`//`
151			`ifdef GPIO_RGPIO_INTE
152			`reg [gw-1:0] rgpio_inte; // RGPIO_INTE register`
153			`else
154			`wire [gw-1:0] rgpio_inte; // No register`
155			`endif
156
157			`//`
158			`// GPIO Positive edge Triggered Register (or no register)`
159			`//`
160			`ifdef GPIO_RGPIO_PTRIG
161			`reg [gw-1:0] rgpio_ptrig; // RGPIO_PTRIG register`
162			`else
163			`wire [gw-1:0] rgpio_ptrig; // No register`
164			`endif
165
166			`//`
167			`// GPIO Auxiliary select Register (or no register)`
168			`//`
169			`ifdef GPIO_RGPIO_AUX
170			`reg [gw-1:0] rgpio_aux; // RGPIO_AUX register`
171			`else
172			`wire [gw-1:0] rgpio_aux; // No register`
173			`endif
174
175			`//`
176			`// GPIO Control Register (or no register)`
177			`//`
178			`ifdef GPIO_RGPIO_CTRL
179			`reg [3:0] rgpio_ctrl; // RGPIO_CTRL register`
180			`else
181			`wire [3:0] rgpio_ctrl; // No register`
182			`endif
183
184			`//`
185			`// Internal wires & regs`
186			`//`
187			`wire rgpio_out_sel; // RGPIO_OUT select`
188			`wire rgpio_oe_sel; // RGPIO_OE select`
189			`wire rgpio_inte_sel; // RGPIO_INTE select`
190			`wire rgpio_ptrig_sel;// RGPIO_PTRIG select`
191			`wire rgpio_aux_sel; // RGPIO_AUX select`
192			`wire rgpio_ctrl_sel; // RGPIO_CTRL select`
193			`wire latch_clk; // Latch clock`
194			`wire full_decoding; // Full address decoding qualification`
195	17	lampret	`wire [gw-1:0] in_muxed; // Muxed inputs`
196			`wire wb_ack; // WB Acknowledge`
197			`wire wb_err; // WB Error`
198			`wire wb_inta; // WB Interrupt`
199			`reg [dw-1:0] wb_dat; // WB Data out`
200			`ifdef GPIO_REGISTERED_WB_OUTPUTS
201			`reg wb_ack_o; // WB Acknowledge`
202			`reg wb_err_o; // WB Error`
203			`reg wb_inta_o; // WB Interrupt`
204			`reg [dw-1:0] wb_dat_o; // WB Data out`
205			`endif
206			`wire [gw-1:0] out_pad; // GPIO Outputs`
207			`ifdef GPIO_REGISTERED_IO_OUTPUTS
208			`reg [gw-1:0] out_pad_o; // GPIO Outputs`
209			`endif
210			`wire [gw-1:0] extc_in; // Muxed inputs sampled by external clock`
211			`wire pext_clk; // External clock for posedge flops`
212			`reg [gw-1:0] pextc_sampled; // Posedge external clock sampled inputs`
213			`ifdef GPIO_NO_NEGEDGE_FLOPS
214			`else
215			`reg [gw-1:0] nextc_sampled; // Negedge external clock sampled inputs`
216			`endif
217	14	lampret
218			`//`
219			`// All WISHBONE transfer terminations are successful except when:`
220			`// a) full address decoding is enabled and address doesn't match`
221			`// any of the GPIO registers`
222			`// b) wb_sel_i evaluation is enabled and one of the wb_sel_i inputs is zero`
223			`//`
224	17	lampret
225			`//`
226			`// WB Acknowledge`
227			`//`
228			`assign wb_ack = wb_cyc_i & wb_stb_i & !wb_err_o;`
229
230			`//`
231			`// Optional registration of WB Ack`
232			`//`
233			`ifdef GPIO_REGISTERED_WB_OUTPUTS
234			`always @(posedge wb_clk_i or posedge wb_rst_i)`
235			`if (wb_rst_i)`
236			`wb_ack_o <= #1 1'b0;`
237			`else`
238			`wb_ack_o <= #1 wb_ack;`
239			`else
240			`assign wb_ack_o = wb_ack;`
241			`endif
242
243			`//`
244			`// WB Error`
245			`//`
246	14	lampret	`ifdef GPIO_FULL_DECODE
247			`ifdef GPIO_STRICT_32BIT_ACCESS
248	17	lampret	`assign wb_err = wb_cyc_i & wb_stb_i & (!full_decoding \| (wb_sel_i != 4'b1111));`
249	14	lampret	`else
250	17	lampret	`assign wb_err = wb_cyc_i & wb_stb_i & !full_decoding;`
251	14	lampret	`endif
252			`else
253			`ifdef GPIO_STRICT_32BIT_ACCESS
254	17	lampret	`assign wb_err = wb_cyc_i & wb_stb_i & (wb_sel_i != 4'b1111);`
255	14	lampret	`else
256	17	lampret	`assign wb_err = 1'b0;`
257	14	lampret	`endif
258			`endif
259
260			`//`
261	17	lampret	`// Optional registration of WB error`
262	14	lampret	`//`
263	17	lampret	`ifdef GPIO_REGISTERED_WB_OUTPUTS
264			`always @(posedge wb_clk_i or posedge wb_rst_i)`
265			`if (wb_rst_i)`
266			`wb_err_o <= #1 1'b0;`
267			`else`
268			`wb_err_o <= #1 wb_err;`
269			`else
270			`assign wb_err_o = wb_err;`
271			`endif
272	14	lampret
273			`//`
274			`// Full address decoder`
275			`//`
276			`ifdef GPIO_FULL_DECODE
277			assign full_decoding = (wb_adr_i[`GPIO_ADDRHH:`GPIO_ADDRHL] == {`GPIO_ADDRHH-`GPIO_ADDRHL+1{1'b0}}) &
278			(wb_adr_i[`GPIO_ADDRLH:`GPIO_ADDRLL] == {`GPIO_ADDRLH-`GPIO_ADDRLL+1{1'b0}});
279			`else
280			`assign full_decoding = 1'b1;`
281			`endif
282
283			`//`
284			`// GPIO registers address decoder`
285			`//`
286			assign rgpio_out_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_OUT) & full_decoding;
287			assign rgpio_oe_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_OE) & full_decoding;
288			assign rgpio_inte_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_INTE) & full_decoding;
289			assign rgpio_ptrig_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_PTRIG) & full_decoding;
290			assign rgpio_aux_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_AUX) & full_decoding;
291			assign rgpio_ctrl_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_CTRL) & full_decoding;
292
293			`//`
294			`// Write to RGPIO_CTRL or update of RGPIO_CTRL[INT] bit`
295			`//`
296			`ifdef GPIO_RGPIO_CTRL
297			`always @(posedge wb_clk_i or posedge wb_rst_i)`
298			`if (wb_rst_i)`
299			`rgpio_ctrl <= #1 4'b0;`
300			`else if (rgpio_ctrl_sel && wb_we_i)`
301			`rgpio_ctrl <= #1 wb_dat_i[3:0];`
302			else if (rgpio_ctrl[`GPIO_RGPIO_CTRL_INTE])
303			rgpio_ctrl[`GPIO_RGPIO_CTRL_INT] <= #1 rgpio_ctrl[`GPIO_RGPIO_CTRL_INT] \| wb_inta_o;
304			`else
305			`assign rgpio_ctrl = 4'h01; // RGPIO_CTRL[EN] = 1`
306			`endif
307
308			`//`
309			`// Write to RGPIO_OUT`
310			`//`
311			`ifdef GPIO_RGPIO_OUT
312			`always @(posedge wb_clk_i or posedge wb_rst_i)`
313			`if (wb_rst_i)`
314			`rgpio_out <= #1 {gw{1'b0}};`
315			`else if (rgpio_out_sel && wb_we_i)`
316			`rgpio_out <= #1 wb_dat_i[gw-1:0];`
317			`else
318	17	lampret	assign rgpio_out = `GPIO_DEF_RGPIO_OUT; // RGPIO_OUT = 0x0
319	14	lampret	`endif
320
321			`//`
322	17	lampret	`// Write to RGPIO_OE. Bits in RGPIO_OE are stored inverted.`
323	14	lampret	`//`
324			`ifdef GPIO_RGPIO_OE
325			`always @(posedge wb_clk_i or posedge wb_rst_i)`
326			`if (wb_rst_i)`
327			`rgpio_oe <= #1 {gw{1'b0}};`
328			`else if (rgpio_oe_sel && wb_we_i)`
329	17	lampret	`rgpio_oe <= #1 ~wb_dat_i[gw-1:0];`
330	14	lampret	`else
331			assign rgpio_oe = `GPIO_DEF_RPGIO_OE; // RGPIO_OE = 0x0
332			`endif
333
334			`//`
335			`// Write to RGPIO_INTE`
336			`//`
337			`ifdef GPIO_RGPIO_INTE
338			`always @(posedge wb_clk_i or posedge wb_rst_i)`
339			`if (wb_rst_i)`
340			`rgpio_inte <= #1 {gw{1'b0}};`
341			`else if (rgpio_inte_sel && wb_we_i)`
342			`rgpio_inte <= #1 wb_dat_i[gw-1:0];`
343			`else
344			assign rgpio_inte = `GPIO_DEF_RPGIO_INTE; // RGPIO_INTE = 0x0
345			`endif
346
347			`//`
348			`// Write to RGPIO_PTRIG`
349			`//`
350			`ifdef GPIO_RGPIO_PTRIG
351			`always @(posedge wb_clk_i or posedge wb_rst_i)`
352			`if (wb_rst_i)`
353			`rgpio_ptrig <= #1 {gw{1'b0}};`
354			`else if (rgpio_ptrig_sel && wb_we_i)`
355			`rgpio_ptrig <= #1 wb_dat_i[gw-1:0];`
356			`else
357			assign rgpio_ptrig = `GPIO_DEF_RPGIO_PTRIG; // RGPIO_PTRIG = 0x0
358			`endif
359
360			`//`
361			`// Write to RGPIO_AUX`
362			`//`
363			`ifdef GPIO_RGPIO_AUX
364			`always @(posedge wb_clk_i or posedge wb_rst_i)`
365			`if (wb_rst_i)`
366			`rgpio_aux <= #1 {gw{1'b0}};`
367			`else if (rgpio_aux_sel && wb_we_i)`
368			`rgpio_aux <= #1 wb_dat_i[gw-1:0];`
369			`else
370			assign rgpio_aux = `GPIO_DEF_RPGIO_AUX; // RGPIO_AUX = 0x0
371			`endif
372
373			`//`
374			`// Latch into RGPIO_IN`
375			`//`
376			`ifdef GPIO_RGPIO_IN
377	17	lampret	`always @(posedge wb_clk_i or posedge wb_rst_i)`
378	14	lampret	`if (wb_rst_i)`
379			`rgpio_in <= #1 {gw{1'b0}};`
380			`else`
381	17	lampret	`rgpio_in <= #1 in_muxed;`
382	14	lampret	`else
383	17	lampret	`assign rgpio_in = in_muxed;`
384	14	lampret	`endif
385
386			`//`
387	17	lampret	`// Mux inputs directly from input pads with inputs sampled by external clock`
388	14	lampret	`//`
389	17	lampret	assign in_muxed = rgpio_ctrl[`GPIO_RGPIO_CTRL_ECLK] ? extc_in : in_pad_i;
390
391			`//`
392			`// Posedge pext_clk is inverted by NEC bit if negedge flops are not allowed.`
393			`// If negedge flops are allowed, pext_clk only clocks posedge flops.`
394			`//`
395			`ifdef GPIO_NO_NEGEDGE_FLOPS
396			assign pext_clk = rgpio_ctrl[`GPIO_RGPIO_CTRL_NEC] ? ~ext_clk_pad_i : ext_clk_pad_i;
397			`else
398			`assign pext_clk = ext_clk_pad_i;`
399			`endif
400
401			`//`
402			`// If negedge flops are allowed, ext_in is mux of negedge and posedge external clocked flops.`
403			`//`
404			`ifdef GPIO_NO_NEGEDGE_FLOPS
405			`assign extc_in = pextc_sampled;`
406			`else
407			assign extc_in = rgpio_ctrl[`GPIO_RGPIO_CTRL_NEC] ? nextc_sampled : pextc_sampled;
408			`endif
409
410			`//`
411			`// Latch using posedge external clock`
412			`//`
413			`always @(posedge pext_clk or posedge wb_rst_i)`
414			`if (wb_rst_i)`
415			`pextc_sampled <= #1 {gw{1'b0}};`
416			`else`
417			`pextc_sampled <= #1 in_pad_i;`
418
419			`//`
420			`// Latch using negedge external clock`
421			`//`
422			`ifdef GPIO_NO_NEGEDGE_FLOPS
423			`else
424			`always @(negedge ext_clk_pad_i or posedge wb_rst_i)`
425			`if (wb_rst_i)`
426			`nextc_sampled <= #1 {gw{1'b0}};`
427			`else`
428			`nextc_sampled <= #1 in_pad_i;`
429			`endif
430
431			`//`
432			`// Mux all registers when doing a read of GPIO registers`
433			`//`
434	14	lampret	`always @(wb_adr_i or rgpio_in or rgpio_out or rgpio_oe or rgpio_inte or`
435			`rgpio_ptrig or rgpio_aux or rgpio_ctrl)`
436			case (wb_adr_i[`GPIO_OFS_BITS]) // synopsys full_case parallel_case
437			`ifdef GPIO_READREGS
438			`GPIO_RGPIO_OUT: begin
439	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_out};`
440	14	lampret	`end`
441			`GPIO_RGPIO_OE: begin
442	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, ~rgpio_oe};`
443	14	lampret	`end`
444			`GPIO_RGPIO_INTE: begin
445	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_inte};`
446	14	lampret	`end`
447			`GPIO_RGPIO_PTRIG: begin
448	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_ptrig};`
449	14	lampret	`end`
450			`GPIO_RGPIO_AUX: begin
451	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_aux};`
452	14	lampret	`end`
453			`GPIO_RGPIO_CTRL: begin
454	20	lampret	`wb_dat[3:0] = rgpio_ctrl;`
455			`wb_dat[dw-1:4] = {dw-4{1'b0}};`
456	14	lampret	`end`
457			`endif
458			`default: begin`
459	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_in};`
460	14	lampret	`end`
461			`endcase`
462
463			`//`
464	17	lampret	`// WB data output`
465			`//`
466			`ifdef GPIO_REGISTERED_WB_OUTPUTS
467			`always @(posedge wb_clk_i or posedge wb_rst_i)`
468			`if (wb_rst_i)`
469			`wb_dat_o <= #1 {dw{1'b0}};`
470			`else`
471			`wb_dat_o <= #1 wb_dat;`
472			`else
473			`assign wb_dat_o = wb_dat;`
474			`endif
475
476			`//`
477	14	lampret	`// Generate interrupt request`
478			`//`
479	17	lampret	assign wb_inta = ((in_pad_i ^ ~rgpio_ptrig) & rgpio_inte) ? rgpio_ctrl[`GPIO_RGPIO_CTRL_INTE] : 1'b0;
480	14	lampret
481			`//`
482	17	lampret	`// Optional registration of WB interrupt`
483	14	lampret	`//`
484	17	lampret	`ifdef GPIO_REGISTERED_WB_OUTPUTS
485			`always @(posedge wb_clk_i or posedge wb_rst_i)`
486			`if (wb_rst_i)`
487	19	lampret	`wb_inta_o <= #1 1'b0;`
488	17	lampret	`else`
489			`wb_inta_o <= #1 wb_inta;`
490			`else
491			`assign wb_inta_o = wb_inta;`
492			`endif
493	14	lampret
494			`//`
495	17	lampret	`// Output enables are RGPIO_OE bits`
496	14	lampret	`//`
497	17	lampret	`assign oen_padoen_o = rgpio_oe;`
498	14	lampret
499	17	lampret	`//`
500			`// Generate GPIO outputs`

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