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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 1.5  2001/12/12 20:35:53  lampret
// Fixing style.
//
// 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
 
//
// GPIO Interrupt Status Register (or no register)
//
`ifdef GPIO_RGPIO_INTS
reg     [gw-1:0] rgpio_ints;     // RGPIO_INTS register
`else
wire    [gw-1:0] rgpio_ints;     // 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                    rgpio_ints_sel; // RGPIO_INTS 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;
assign rgpio_ints_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_INTS) & 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_INTS] <= #1 rgpio_ctrl[`GPIO_RGPIO_CTRL_INTS] | 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
                `GPIO_RGPIO_INTS: begin
                        wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_ints};
                end
                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
 
//
// RGPIO_INTS
//
`ifdef GPIO_RGPIO_INTS
always @(posedge wb_clk_i or posedge wb_rst_i)
        if (wb_rst_i)
                rgpio_ints <= #1 {gw{1'b0}};
        else if (rgpio_ints_sel && wb_we_i)
                rgpio_ints <= #1 wb_dat_i[gw-1:0];
        else if (rgpio_ctrl[`GPIO_RGPIO_CTRL_INTE])
                rgpio_ints <= #1 rgpio_ints | (in_pad_i ^ ~rgpio_ptrig) & rgpio_inte;
`else
assign rgpio_ints = (in_pad_i ^ ~rgpio_ptrig) & rgpio_inte;
`endif
 
//
// Generate interrupt request
//
assign wb_inta = |rgpio_ints ? 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	21	lampret	`// Revision 1.5 2001/12/12 20:35:53 lampret`
49			`// Fixing style.`
50			`//`
51	20	lampret	`// Revision 1.4 2001/12/12 07:12:58 lampret`
52			`// Fixed bug when wb_inta_o is registered (GPIO_WB_REGISTERED_OUTPUTS)`
53			`//`
54	19	lampret	`// Revision 1.3 2001/11/15 02:24:37 lampret`
55			`// Added GPIO_REGISTERED_WB_OUTPUTS, GPIO_REGISTERED_IO_OUTPUTS and GPIO_NO_NEGEDGE_FLOPS.`
56			`//`
57	17	lampret	`// Revision 1.2 2001/10/31 02:26:51 lampret`
58			`// Fixed wb_err_o.`
59			`//`
60	15	lampret	`// Revision 1.1 2001/09/18 18:49:07 lampret`
61			`// Changed top level ptc into gpio_top. Changed defines.v into gpio_defines.v.`
62			`//`
63	14	lampret	`// Revision 1.1 2001/08/21 21:39:28 lampret`
64			`// Changed directory structure, port names and drfines.`
65			`//`
66			`// Revision 1.2 2001/07/14 20:39:26 lampret`
67			`// Better configurability.`
68			`//`
69			`// Revision 1.1 2001/06/05 07:45:26 lampret`
70			`// Added initial RTL and test benches. There are still some issues with these files.`
71			`//`
72			`//`
73
74			`// synopsys translate_off`
75			`include "timescale.v"
76			`// synopsys translate_on`
77			`include "gpio_defines.v"
78
79			`module gpio_top(`
80			`// WISHBONE Interface`
81			`wb_clk_i, wb_rst_i, wb_cyc_i, wb_adr_i, wb_dat_i, wb_sel_i, wb_we_i, wb_stb_i,`
82			`wb_dat_o, wb_ack_o, wb_err_o, wb_inta_o,`
83
84			`// Auxiliary inputs interface`
85			`aux_i,`
86
87			`// External GPIO Interface`
88			`in_pad_i, ext_clk_pad_i, out_pad_o, oen_padoen_o`
89			`);`
90
91			`parameter dw = 32;`
92			parameter aw = `GPIO_ADDRHH+1;
93			parameter gw = `GPIO_IOS;
94
95			`//`
96			`// WISHBONE Interface`
97			`//`
98			`input wb_clk_i; // Clock`
99			`input wb_rst_i; // Reset`
100			`input wb_cyc_i; // cycle valid input`
101			`input [aw-1:0] wb_adr_i; // address bus inputs`
102			`input [dw-1:0] wb_dat_i; // input data bus`
103			`input [3:0] wb_sel_i; // byte select inputs`
104			`input wb_we_i; // indicates write transfer`
105			`input wb_stb_i; // strobe input`
106			`output [dw-1:0] wb_dat_o; // output data bus`
107			`output wb_ack_o; // normal termination`
108			`output wb_err_o; // termination w/ error`
109			`output wb_inta_o; // Interrupt request output`
110
111			`// Auxiliary Inputs Interface`
112			`input [gw-1:0] aux_i; // Auxiliary inputs`
113
114			`//`
115			`// External GPIO Interface`
116			`//`
117			`input [gw-1:0] in_pad_i; // GPIO Inputs`
118			`input ext_clk_pad_i; // GPIO Eclk`
119			`output [gw-1:0] out_pad_o; // GPIO Outputs`
120			`output [gw-1:0] oen_padoen_o; // GPIO output drivers enables`
121
122			`ifdef GPIO_IMPLEMENTED
123
124			`//`
125			`// GPIO Input Register (or no register)`
126			`//`
127			`ifdef GPIO_RGPIO_IN
128			`reg [gw-1:0] rgpio_in; // RGPIO_IN register`
129			`else
130			`wire [gw-1:0] rgpio_in; // No register`
131			`endif
132
133			`//`
134			`// GPIO Output Register (or no register)`
135			`//`
136			`ifdef GPIO_RGPIO_OUT
137			`reg [gw-1:0] rgpio_out; // RGPIO_OUT register`
138			`else
139			`wire [gw-1:0] rgpio_out; // No register`
140			`endif
141
142			`//`
143			`// GPIO Output Driver Enable Register (or no register)`
144			`//`
145			`ifdef GPIO_RGPIO_OE
146			`reg [gw-1:0] rgpio_oe; // RGPIO_OE register`
147			`else
148			`wire [gw-1:0] rgpio_oe; // No register`
149			`endif
150
151			`//`
152			`// GPIO Interrupt Enable Register (or no register)`
153			`//`
154			`ifdef GPIO_RGPIO_INTE
155			`reg [gw-1:0] rgpio_inte; // RGPIO_INTE register`
156			`else
157			`wire [gw-1:0] rgpio_inte; // No register`
158			`endif
159
160			`//`
161			`// GPIO Positive edge Triggered Register (or no register)`
162			`//`
163			`ifdef GPIO_RGPIO_PTRIG
164			`reg [gw-1:0] rgpio_ptrig; // RGPIO_PTRIG register`
165			`else
166			`wire [gw-1:0] rgpio_ptrig; // No register`
167			`endif
168
169			`//`
170			`// GPIO Auxiliary select Register (or no register)`
171			`//`
172			`ifdef GPIO_RGPIO_AUX
173			`reg [gw-1:0] rgpio_aux; // RGPIO_AUX register`
174			`else
175			`wire [gw-1:0] rgpio_aux; // No register`
176			`endif
177
178			`//`
179			`// GPIO Control Register (or no register)`
180			`//`
181			`ifdef GPIO_RGPIO_CTRL
182			`reg [3:0] rgpio_ctrl; // RGPIO_CTRL register`
183			`else
184			`wire [3:0] rgpio_ctrl; // No register`
185			`endif
186
187			`//`
188	21	lampret	`// GPIO Interrupt Status Register (or no register)`
189			`//`
190			`ifdef GPIO_RGPIO_INTS
191			`reg [gw-1:0] rgpio_ints; // RGPIO_INTS register`
192			`else
193			`wire [gw-1:0] rgpio_ints; // No register`
194			`endif
195
196			`//`
197	14	lampret	`// Internal wires & regs`
198			`//`
199			`wire rgpio_out_sel; // RGPIO_OUT select`
200			`wire rgpio_oe_sel; // RGPIO_OE select`
201			`wire rgpio_inte_sel; // RGPIO_INTE select`
202			`wire rgpio_ptrig_sel;// RGPIO_PTRIG select`
203			`wire rgpio_aux_sel; // RGPIO_AUX select`
204			`wire rgpio_ctrl_sel; // RGPIO_CTRL select`
205	21	lampret	`wire rgpio_ints_sel; // RGPIO_INTS select`
206	14	lampret	`wire latch_clk; // Latch clock`
207			`wire full_decoding; // Full address decoding qualification`
208	17	lampret	`wire [gw-1:0] in_muxed; // Muxed inputs`
209			`wire wb_ack; // WB Acknowledge`
210			`wire wb_err; // WB Error`
211			`wire wb_inta; // WB Interrupt`
212			`reg [dw-1:0] wb_dat; // WB Data out`
213			`ifdef GPIO_REGISTERED_WB_OUTPUTS
214			`reg wb_ack_o; // WB Acknowledge`
215			`reg wb_err_o; // WB Error`
216			`reg wb_inta_o; // WB Interrupt`
217			`reg [dw-1:0] wb_dat_o; // WB Data out`
218			`endif
219			`wire [gw-1:0] out_pad; // GPIO Outputs`
220			`ifdef GPIO_REGISTERED_IO_OUTPUTS
221			`reg [gw-1:0] out_pad_o; // GPIO Outputs`
222			`endif
223			`wire [gw-1:0] extc_in; // Muxed inputs sampled by external clock`
224			`wire pext_clk; // External clock for posedge flops`
225			`reg [gw-1:0] pextc_sampled; // Posedge external clock sampled inputs`
226			`ifdef GPIO_NO_NEGEDGE_FLOPS
227			`else
228			`reg [gw-1:0] nextc_sampled; // Negedge external clock sampled inputs`
229			`endif
230	14	lampret
231			`//`
232			`// All WISHBONE transfer terminations are successful except when:`
233			`// a) full address decoding is enabled and address doesn't match`
234			`// any of the GPIO registers`
235			`// b) wb_sel_i evaluation is enabled and one of the wb_sel_i inputs is zero`
236			`//`
237	17	lampret
238			`//`
239			`// WB Acknowledge`
240			`//`
241			`assign wb_ack = wb_cyc_i & wb_stb_i & !wb_err_o;`
242
243			`//`
244			`// Optional registration of WB Ack`
245			`//`
246			`ifdef GPIO_REGISTERED_WB_OUTPUTS
247			`always @(posedge wb_clk_i or posedge wb_rst_i)`
248			`if (wb_rst_i)`
249			`wb_ack_o <= #1 1'b0;`
250			`else`
251			`wb_ack_o <= #1 wb_ack;`
252			`else
253			`assign wb_ack_o = wb_ack;`
254			`endif
255
256			`//`
257			`// WB Error`
258			`//`
259	14	lampret	`ifdef GPIO_FULL_DECODE
260			`ifdef GPIO_STRICT_32BIT_ACCESS
261	17	lampret	`assign wb_err = wb_cyc_i & wb_stb_i & (!full_decoding \| (wb_sel_i != 4'b1111));`
262	14	lampret	`else
263	17	lampret	`assign wb_err = wb_cyc_i & wb_stb_i & !full_decoding;`
264	14	lampret	`endif
265			`else
266			`ifdef GPIO_STRICT_32BIT_ACCESS
267	17	lampret	`assign wb_err = wb_cyc_i & wb_stb_i & (wb_sel_i != 4'b1111);`
268	14	lampret	`else
269	17	lampret	`assign wb_err = 1'b0;`
270	14	lampret	`endif
271			`endif
272
273			`//`
274	17	lampret	`// Optional registration of WB error`
275	14	lampret	`//`
276	17	lampret	`ifdef GPIO_REGISTERED_WB_OUTPUTS
277			`always @(posedge wb_clk_i or posedge wb_rst_i)`
278			`if (wb_rst_i)`
279			`wb_err_o <= #1 1'b0;`
280			`else`
281			`wb_err_o <= #1 wb_err;`
282			`else
283			`assign wb_err_o = wb_err;`
284			`endif
285	14	lampret
286			`//`
287			`// Full address decoder`
288			`//`
289			`ifdef GPIO_FULL_DECODE
290			assign full_decoding = (wb_adr_i[`GPIO_ADDRHH:`GPIO_ADDRHL] == {`GPIO_ADDRHH-`GPIO_ADDRHL+1{1'b0}}) &
291			(wb_adr_i[`GPIO_ADDRLH:`GPIO_ADDRLL] == {`GPIO_ADDRLH-`GPIO_ADDRLL+1{1'b0}});
292			`else
293			`assign full_decoding = 1'b1;`
294			`endif
295
296			`//`
297			`// GPIO registers address decoder`
298			`//`
299			assign rgpio_out_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_OUT) & full_decoding;
300			assign rgpio_oe_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_OE) & full_decoding;
301			assign rgpio_inte_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_INTE) & full_decoding;
302			assign rgpio_ptrig_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_PTRIG) & full_decoding;
303			assign rgpio_aux_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_AUX) & full_decoding;
304			assign rgpio_ctrl_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_CTRL) & full_decoding;
305	21	lampret	assign rgpio_ints_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`GPIO_OFS_BITS] == `GPIO_RGPIO_INTS) & full_decoding;
306	14	lampret
307			`//`
308			`// Write to RGPIO_CTRL or update of RGPIO_CTRL[INT] bit`
309			`//`
310			`ifdef GPIO_RGPIO_CTRL
311			`always @(posedge wb_clk_i or posedge wb_rst_i)`
312			`if (wb_rst_i)`
313			`rgpio_ctrl <= #1 4'b0;`
314			`else if (rgpio_ctrl_sel && wb_we_i)`
315			`rgpio_ctrl <= #1 wb_dat_i[3:0];`
316			else if (rgpio_ctrl[`GPIO_RGPIO_CTRL_INTE])
317	21	lampret	rgpio_ctrl[`GPIO_RGPIO_CTRL_INTS] <= #1 rgpio_ctrl[`GPIO_RGPIO_CTRL_INTS] \| wb_inta_o;
318	14	lampret	`else
319			`assign rgpio_ctrl = 4'h01; // RGPIO_CTRL[EN] = 1`
320			`endif
321
322			`//`
323			`// Write to RGPIO_OUT`
324			`//`
325			`ifdef GPIO_RGPIO_OUT
326			`always @(posedge wb_clk_i or posedge wb_rst_i)`
327			`if (wb_rst_i)`
328			`rgpio_out <= #1 {gw{1'b0}};`
329			`else if (rgpio_out_sel && wb_we_i)`
330			`rgpio_out <= #1 wb_dat_i[gw-1:0];`
331			`else
332	17	lampret	assign rgpio_out = `GPIO_DEF_RGPIO_OUT; // RGPIO_OUT = 0x0
333	14	lampret	`endif
334
335			`//`
336	17	lampret	`// Write to RGPIO_OE. Bits in RGPIO_OE are stored inverted.`
337	14	lampret	`//`
338			`ifdef GPIO_RGPIO_OE
339			`always @(posedge wb_clk_i or posedge wb_rst_i)`
340			`if (wb_rst_i)`
341			`rgpio_oe <= #1 {gw{1'b0}};`
342			`else if (rgpio_oe_sel && wb_we_i)`
343	17	lampret	`rgpio_oe <= #1 ~wb_dat_i[gw-1:0];`
344	14	lampret	`else
345			assign rgpio_oe = `GPIO_DEF_RPGIO_OE; // RGPIO_OE = 0x0
346			`endif
347
348			`//`
349			`// Write to RGPIO_INTE`
350			`//`
351			`ifdef GPIO_RGPIO_INTE
352			`always @(posedge wb_clk_i or posedge wb_rst_i)`
353			`if (wb_rst_i)`
354			`rgpio_inte <= #1 {gw{1'b0}};`
355			`else if (rgpio_inte_sel && wb_we_i)`
356			`rgpio_inte <= #1 wb_dat_i[gw-1:0];`
357			`else
358			assign rgpio_inte = `GPIO_DEF_RPGIO_INTE; // RGPIO_INTE = 0x0
359			`endif
360
361			`//`
362			`// Write to RGPIO_PTRIG`
363			`//`
364			`ifdef GPIO_RGPIO_PTRIG
365			`always @(posedge wb_clk_i or posedge wb_rst_i)`
366			`if (wb_rst_i)`
367			`rgpio_ptrig <= #1 {gw{1'b0}};`
368			`else if (rgpio_ptrig_sel && wb_we_i)`
369			`rgpio_ptrig <= #1 wb_dat_i[gw-1:0];`
370			`else
371			assign rgpio_ptrig = `GPIO_DEF_RPGIO_PTRIG; // RGPIO_PTRIG = 0x0
372			`endif
373
374			`//`
375			`// Write to RGPIO_AUX`
376			`//`
377			`ifdef GPIO_RGPIO_AUX
378			`always @(posedge wb_clk_i or posedge wb_rst_i)`
379			`if (wb_rst_i)`
380			`rgpio_aux <= #1 {gw{1'b0}};`
381			`else if (rgpio_aux_sel && wb_we_i)`
382			`rgpio_aux <= #1 wb_dat_i[gw-1:0];`
383			`else
384			assign rgpio_aux = `GPIO_DEF_RPGIO_AUX; // RGPIO_AUX = 0x0
385			`endif
386
387			`//`
388			`// Latch into RGPIO_IN`
389			`//`
390			`ifdef GPIO_RGPIO_IN
391	17	lampret	`always @(posedge wb_clk_i or posedge wb_rst_i)`
392	14	lampret	`if (wb_rst_i)`
393			`rgpio_in <= #1 {gw{1'b0}};`
394			`else`
395	17	lampret	`rgpio_in <= #1 in_muxed;`
396	14	lampret	`else
397	17	lampret	`assign rgpio_in = in_muxed;`
398	14	lampret	`endif
399
400			`//`
401	17	lampret	`// Mux inputs directly from input pads with inputs sampled by external clock`
402	14	lampret	`//`
403	17	lampret	assign in_muxed = rgpio_ctrl[`GPIO_RGPIO_CTRL_ECLK] ? extc_in : in_pad_i;
404
405			`//`
406			`// Posedge pext_clk is inverted by NEC bit if negedge flops are not allowed.`
407			`// If negedge flops are allowed, pext_clk only clocks posedge flops.`
408			`//`
409			`ifdef GPIO_NO_NEGEDGE_FLOPS
410			assign pext_clk = rgpio_ctrl[`GPIO_RGPIO_CTRL_NEC] ? ~ext_clk_pad_i : ext_clk_pad_i;
411			`else
412			`assign pext_clk = ext_clk_pad_i;`
413			`endif
414
415			`//`
416			`// If negedge flops are allowed, ext_in is mux of negedge and posedge external clocked flops.`
417			`//`
418			`ifdef GPIO_NO_NEGEDGE_FLOPS
419			`assign extc_in = pextc_sampled;`
420			`else
421			assign extc_in = rgpio_ctrl[`GPIO_RGPIO_CTRL_NEC] ? nextc_sampled : pextc_sampled;
422			`endif
423
424			`//`
425			`// Latch using posedge external clock`
426			`//`
427			`always @(posedge pext_clk or posedge wb_rst_i)`
428			`if (wb_rst_i)`
429			`pextc_sampled <= #1 {gw{1'b0}};`
430			`else`
431			`pextc_sampled <= #1 in_pad_i;`
432
433			`//`
434			`// Latch using negedge external clock`
435			`//`
436			`ifdef GPIO_NO_NEGEDGE_FLOPS
437			`else
438			`always @(negedge ext_clk_pad_i or posedge wb_rst_i)`
439			`if (wb_rst_i)`
440			`nextc_sampled <= #1 {gw{1'b0}};`
441			`else`
442			`nextc_sampled <= #1 in_pad_i;`
443			`endif
444
445			`//`
446			`// Mux all registers when doing a read of GPIO registers`
447			`//`
448	14	lampret	`always @(wb_adr_i or rgpio_in or rgpio_out or rgpio_oe or rgpio_inte or`
449			`rgpio_ptrig or rgpio_aux or rgpio_ctrl)`
450			case (wb_adr_i[`GPIO_OFS_BITS]) // synopsys full_case parallel_case
451			`ifdef GPIO_READREGS
452			`GPIO_RGPIO_OUT: begin
453	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_out};`
454	14	lampret	`end`
455			`GPIO_RGPIO_OE: begin
456	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, ~rgpio_oe};`
457	14	lampret	`end`
458			`GPIO_RGPIO_INTE: begin
459	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_inte};`
460	14	lampret	`end`
461			`GPIO_RGPIO_PTRIG: begin
462	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_ptrig};`
463	14	lampret	`end`
464			`GPIO_RGPIO_AUX: begin
465	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_aux};`
466	14	lampret	`end`
467			`GPIO_RGPIO_CTRL: begin
468	20	lampret	`wb_dat[3:0] = rgpio_ctrl;`
469			`wb_dat[dw-1:4] = {dw-4{1'b0}};`
470	14	lampret	`end`
471			`endif
472	21	lampret	`GPIO_RGPIO_INTS: begin
473			`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_ints};`
474			`end`
475	14	lampret	`default: begin`
476	20	lampret	`wb_dat[dw-1:0] = {{dw-gw{1'b0}}, rgpio_in};`
477	14	lampret	`end`
478			`endcase`
479
480			`//`
481	17	lampret	`// WB data output`
482			`//`
483			`ifdef GPIO_REGISTERED_WB_OUTPUTS
484			`always @(posedge wb_clk_i or posedge wb_rst_i)`
485			`if (wb_rst_i)`
486			`wb_dat_o <= #1 {dw{1'b0}};`
487			`else`
488			`wb_dat_o <= #1 wb_dat;`
489			`else
490			`assign wb_dat_o = wb_dat;`
491			`endif
492
493			`//`
494	21	lampret	`// RGPIO_INTS`
495			`//`
496			`ifdef GPIO_RGPIO_INTS
497			`always @(posedge wb_clk_i or posedge wb_rst_i)`
498			`if (wb_rst_i)`
499			`rgpio_ints <= #1 {gw{1'b0}};`
500			`else if (rgpio_ints_sel && wb_we_i)`

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