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Add example to show handling of SystemRDL enums

This commit is contained in:
Dennis Potter 2021-10-31 13:59:51 -07:00
parent 0371bef439
commit a871e9a906
Signed by: Dennis
GPG Key ID: 186A8AD440942BAF
6 changed files with 974 additions and 0 deletions
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addrmap enums {
desc =
"This example demonstrates how enumerations are translated to Systemverilog, how enumerations are handled when the same enumeration is redefined in different scopes, and hence how enumerations can be re-used in the RTL that surrounds the register block.
It is not mandatory to use enums in RTL when defining enums in SystemRDL. By providing the command-line argument `--no-enums` all I/O will be defined as flat wires.";
enum first_enum {
val_1 = 2'b10;
val_2 = 2'b01;
};
enum second_enum {
val_3 = 2'b10;
val_4 = 2'b01;
};
reg {
field {sw=rw; hw=rw;} f1 [1:0];
field {sw=rw; hw=rw;} f2 [9:8];
f1->encode = first_enum;
} reg_a;
reg {
field {sw=rw; hw=rw;} f1 [1:0];
field {sw=rw; hw=rw;} f2 [9:8];
f1->encode = second_enum;
} reg_b;
enum third_enum {
val_5 = 2'b10;
val_6 = 2'b01;
};
regfile {
enum fourth_enum {
val_7 = 2'b10;
val_8 = 2'b01;
};
reg {
field {sw=rw; hw=rw;} f1 [1:0];
field {sw=rw; hw=rw;} f2 [9:8];
f1->encode = third_enum;
} reg_c;
reg {
field {sw=rw; hw=rw;} f1 [1:0];
field {sw=rw; hw=rw;} f2 [9:8];
f1->encode = fourth_enum;
} reg_d;
} regfile_1;
};

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/*****************************************************************
*
* ███████╗██████╗ ██████╗ ██╗ ██████╗ ███████╗██╗ ██╗
* ██╔════╝██╔══██╗██╔══██╗██║ ╚════██╗██╔════╝██║ ██║
* ███████╗██████╔╝██║ ██║██║ █████╔╝███████╗██║ ██║
* ╚════██║██╔══██╗██║ ██║██║ ██╔═══╝ ╚════██║╚██╗ ██╔╝
* ███████║██║ ██║██████╔╝███████╗███████╗███████║ ╚████╔╝
* ╚══════╝╚═╝ ╚═╝╚═════╝ ╚══════╝╚══════╝╚══════╝ ╚═══╝
*
* The present RTL was generated by srdl2sv v0.01. The RTL and all
* templates the RTL is derived from are licensed under the MIT
* license. The license is shown below.
*
* srdl2sv itself is licensed under GPLv3.
*
* Maintainer : Dennis Potter <dennis@dennispotter.eu>
* Report Bugs: https://github.com/Silicon1602/srdl2sv/issues
*
* ===GENERATION INFORMATION======================================
*
* Generation information:
* - User: : dpotter
* - Time : October 31 2021 13:59:16
* - Path : /home/dpotter/srdl2sv/examples/enums
* - RDL file : ['enums.rdl']
* - Hostname : ArchXPS
*
* RDL include directories:
* -
*
* Commandline arguments to srdl2sv:
* - Ouput Directory : ./srdl2sv_out
* - Stream Log Level : INFO
* - File Log Level : NONE
* - Use Real Tabs : False
* - Tab Width : 4
* - Enums Enabled : True
* - Register Bus Type: amba3ahblite
* - Address width : 32
* - Byte enables : True
* - Descriptions : {'AddrMap': False, 'RegFile': False, 'Memory': False, 'Register': False, 'Field': False}
*
* ===LICENSE OF ENUMS.SV=====================================
*
* Copyright 2021 Dennis Potter <dennis@dennispotter.eu>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
****************************************************************/
module enums
import enums_pkg::*;
import enums__regfile_1_pkg::*;
(
// Resets
// Inputs
input clk ,
input HRESETn ,
input [31:0] HADDR ,
input HWRITE ,
input [2:0] HSIZE ,
input [3:0] HPROT ,
input [1:0] HTRANS ,
input [32-1:0] HWDATA ,
input HSEL ,
input enums_pkg::third_enum regfile_1__reg_c__f1_in,
input logic [1:0] regfile_1__reg_c__f2_in,
input enums__regfile_1_pkg::fourth_enum regfile_1__reg_d__f1_in,
input logic [1:0] regfile_1__reg_d__f2_in,
input enums_pkg::first_enum reg_a__f1_in ,
input logic [1:0] reg_a__f2_in ,
input enums_pkg::second_enum reg_b__f1_in ,
input logic [1:0] reg_b__f2_in ,
// Outputs
output HREADYOUT ,
output HRESP ,
output [32-1:0] HRDATA ,
output enums_pkg::third_enum regfile_1__reg_c__f1_r,
output logic [1:0] regfile_1__reg_c__f2_r,
output enums__regfile_1_pkg::fourth_enum regfile_1__reg_d__f1_r,
output logic [1:0] regfile_1__reg_d__f2_r,
output enums_pkg::first_enum reg_a__f1_r ,
output logic [1:0] reg_a__f2_r ,
output enums_pkg::second_enum reg_b__f1_r ,
output logic [1:0] reg_b__f2_r
);
// Internal signals
srdl2sv_widget_if #(.ADDR_W (32), .DATA_W(32)) widget_if;
/*******************************************************************
* AMBA 3 AHB Lite Widget
* ======================
* Naming conventions
* - widget_if -> SystemVerilog interface to between widgets
* and the internal srdl2sv registers.
* - H* -> Signals as defined in AMBA3 AHB Lite
* specification
* - clk -> Clock that drives registers and the bus
*******************************************************************/
srdl2sv_amba3ahblite
#(.FLOP_REGISTER_IF (0),
.BUS_BITS (32),
.NO_BYTE_ENABLE (0))
srdl2sv_amba3ahblite_inst
(// Bus protocol
.HRESETn,
.HCLK (clk),
.HADDR,
.HWRITE,
.HSIZE,
.HPROT,
.HTRANS,
.HWDATA,
.HSEL,
.HREADYOUT,
.HRESP,
.HRDATA,
// Interface to internal logic
.widget_if);
/*******************************************************************
*******************************************************************
* REGFILE : regfile_1
* DIMENSION : 0
* DEPTHS (per dimension): []
*******************************************************************
*******************************************************************/
/*******************************************************************
/*******************************************************************
/* REGISTER : reg_c
/* DIMENSION : 0
/* DEPTHS (per dimension): []
/*******************************************************************
/*******************************************************************/
logic regfile_1__reg_c_active ;
logic regfile_1__reg_c_sw_wr ;
logic [31:0] regfile_1__reg_c_data_mux_in;
logic regfile_1__reg_c_rdy_mux_in ;
logic regfile_1__reg_c_err_mux_in ;
enums_pkg::third_enum regfile_1__reg_c__f1_q ;
logic [1:0] regfile_1__reg_c__f2_q ;
// Register-activation for 'regfile_1__reg_c'
assign regfile_1__reg_c_active = widget_if.addr == 8;
assign regfile_1__reg_c_sw_wr = regfile_1__reg_c_active && widget_if.w_vld;
//-----------------FIELD SUMMARY-----------------
// name : f1 (regfile_1__reg_c[1:0])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw', 'encode']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (regfile_1__reg_c_sw_wr)
begin
if (widget_if.byte_en[0])
regfile_1__reg_c__f1_q[1:0] <= widget_if.w_data[1:0];
end
else
// we or wel property not set
regfile_1__reg_c__f1_q <= regfile_1__reg_c__f1_in;
end // of regfile_1__reg_c__f1's always_ff
// Connect register to hardware output port
assign regfile_1__reg_c__f1_r = regfile_1__reg_c__f1_q;
//-----------------FIELD SUMMARY-----------------
// name : f2 (regfile_1__reg_c[9:8])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (regfile_1__reg_c_sw_wr)
begin
if (widget_if.byte_en[1])
regfile_1__reg_c__f2_q[1:0] <= widget_if.w_data[9:8];
end
else
// we or wel property not set
regfile_1__reg_c__f2_q <= regfile_1__reg_c__f2_in;
end // of regfile_1__reg_c__f2's always_ff
// Connect register to hardware output port
assign regfile_1__reg_c__f2_r = regfile_1__reg_c__f2_q;
/**************************************
* Assign all fields to signal to Mux *
**************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign regfile_1__reg_c_data_mux_in = {{22{1'b0}}, regfile_1__reg_c__f2_q, {6{1'b0}}, regfile_1__reg_c__f1_q};
// Internal registers are ready immediately
assign regfile_1__reg_c_rdy_mux_in = 1'b1;
// Return an error if *no* read and *no* write was succesful. If some bits
// cannot be read/written but others are succesful, don't return and error
// Hence, as long as one action can be succesful, no error will be returned.
assign regfile_1__reg_c_err_mux_in = !((widget_if.r_vld && (widget_if.byte_en[0] || widget_if.byte_en[1])) || (widget_if.w_vld && (widget_if.byte_en[0] || widget_if.byte_en[1])));
/*******************************************************************
/*******************************************************************
/* REGISTER : reg_d
/* DIMENSION : 0
/* DEPTHS (per dimension): []
/*******************************************************************
/*******************************************************************/
logic regfile_1__reg_d_active ;
logic regfile_1__reg_d_sw_wr ;
logic [31:0] regfile_1__reg_d_data_mux_in;
logic regfile_1__reg_d_rdy_mux_in ;
logic regfile_1__reg_d_err_mux_in ;
enums__regfile_1_pkg::fourth_enum regfile_1__reg_d__f1_q ;
logic [1:0] regfile_1__reg_d__f2_q ;
// Register-activation for 'regfile_1__reg_d'
assign regfile_1__reg_d_active = widget_if.addr == 12;
assign regfile_1__reg_d_sw_wr = regfile_1__reg_d_active && widget_if.w_vld;
//-----------------FIELD SUMMARY-----------------
// name : f1 (regfile_1__reg_d[1:0])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw', 'encode']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (regfile_1__reg_d_sw_wr)
begin
if (widget_if.byte_en[0])
regfile_1__reg_d__f1_q[1:0] <= widget_if.w_data[1:0];
end
else
// we or wel property not set
regfile_1__reg_d__f1_q <= regfile_1__reg_d__f1_in;
end // of regfile_1__reg_d__f1's always_ff
// Connect register to hardware output port
assign regfile_1__reg_d__f1_r = regfile_1__reg_d__f1_q;
//-----------------FIELD SUMMARY-----------------
// name : f2 (regfile_1__reg_d[9:8])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (regfile_1__reg_d_sw_wr)
begin
if (widget_if.byte_en[1])
regfile_1__reg_d__f2_q[1:0] <= widget_if.w_data[9:8];
end
else
// we or wel property not set
regfile_1__reg_d__f2_q <= regfile_1__reg_d__f2_in;
end // of regfile_1__reg_d__f2's always_ff
// Connect register to hardware output port
assign regfile_1__reg_d__f2_r = regfile_1__reg_d__f2_q;
/**************************************
* Assign all fields to signal to Mux *
**************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign regfile_1__reg_d_data_mux_in = {{22{1'b0}}, regfile_1__reg_d__f2_q, {6{1'b0}}, regfile_1__reg_d__f1_q};
// Internal registers are ready immediately
assign regfile_1__reg_d_rdy_mux_in = 1'b1;
// Return an error if *no* read and *no* write was succesful. If some bits
// cannot be read/written but others are succesful, don't return and error
// Hence, as long as one action can be succesful, no error will be returned.
assign regfile_1__reg_d_err_mux_in = !((widget_if.r_vld && (widget_if.byte_en[0] || widget_if.byte_en[1])) || (widget_if.w_vld && (widget_if.byte_en[0] || widget_if.byte_en[1])));
/*******************************************************************
/*******************************************************************
/* REGISTER : reg_a
/* DIMENSION : 0
/* DEPTHS (per dimension): []
/*******************************************************************
/*******************************************************************/
logic reg_a_active ;
logic reg_a_sw_wr ;
logic [31:0] reg_a_data_mux_in;
logic reg_a_rdy_mux_in ;
logic reg_a_err_mux_in ;
enums_pkg::first_enum reg_a__f1_q ;
logic [1:0] reg_a__f2_q ;
// Register-activation for 'reg_a'
assign reg_a_active = widget_if.addr == 0;
assign reg_a_sw_wr = reg_a_active && widget_if.w_vld;
//-----------------FIELD SUMMARY-----------------
// name : f1 (reg_a[1:0])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw', 'encode']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (reg_a_sw_wr)
begin
if (widget_if.byte_en[0])
reg_a__f1_q[1:0] <= widget_if.w_data[1:0];
end
else
// we or wel property not set
reg_a__f1_q <= reg_a__f1_in;
end // of reg_a__f1's always_ff
// Connect register to hardware output port
assign reg_a__f1_r = reg_a__f1_q;
//-----------------FIELD SUMMARY-----------------
// name : f2 (reg_a[9:8])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (reg_a_sw_wr)
begin
if (widget_if.byte_en[1])
reg_a__f2_q[1:0] <= widget_if.w_data[9:8];
end
else
// we or wel property not set
reg_a__f2_q <= reg_a__f2_in;
end // of reg_a__f2's always_ff
// Connect register to hardware output port
assign reg_a__f2_r = reg_a__f2_q;
/**************************************
* Assign all fields to signal to Mux *
**************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign reg_a_data_mux_in = {{22{1'b0}}, reg_a__f2_q, {6{1'b0}}, reg_a__f1_q};
// Internal registers are ready immediately
assign reg_a_rdy_mux_in = 1'b1;
// Return an error if *no* read and *no* write was succesful. If some bits
// cannot be read/written but others are succesful, don't return and error
// Hence, as long as one action can be succesful, no error will be returned.
assign reg_a_err_mux_in = !((widget_if.r_vld && (widget_if.byte_en[0] || widget_if.byte_en[1])) || (widget_if.w_vld && (widget_if.byte_en[0] || widget_if.byte_en[1])));
/*******************************************************************
/*******************************************************************
/* REGISTER : reg_b
/* DIMENSION : 0
/* DEPTHS (per dimension): []
/*******************************************************************
/*******************************************************************/
logic reg_b_active ;
logic reg_b_sw_wr ;
logic [31:0] reg_b_data_mux_in;
logic reg_b_rdy_mux_in ;
logic reg_b_err_mux_in ;
enums_pkg::second_enum reg_b__f1_q ;
logic [1:0] reg_b__f2_q ;
// Register-activation for 'reg_b'
assign reg_b_active = widget_if.addr == 4;
assign reg_b_sw_wr = reg_b_active && widget_if.w_vld;
//-----------------FIELD SUMMARY-----------------
// name : f1 (reg_b[1:0])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw', 'encode']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (reg_b_sw_wr)
begin
if (widget_if.byte_en[0])
reg_b__f1_q[1:0] <= widget_if.w_data[1:0];
end
else
// we or wel property not set
reg_b__f1_q <= reg_b__f1_in;
end // of reg_b__f1's always_ff
// Connect register to hardware output port
assign reg_b__f1_r = reg_b__f1_q;
//-----------------FIELD SUMMARY-----------------
// name : f2 (reg_b[9:8])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (reg_b_sw_wr)
begin
if (widget_if.byte_en[1])
reg_b__f2_q[1:0] <= widget_if.w_data[9:8];
end
else
// we or wel property not set
reg_b__f2_q <= reg_b__f2_in;
end // of reg_b__f2's always_ff
// Connect register to hardware output port
assign reg_b__f2_r = reg_b__f2_q;
/**************************************
* Assign all fields to signal to Mux *
**************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign reg_b_data_mux_in = {{22{1'b0}}, reg_b__f2_q, {6{1'b0}}, reg_b__f1_q};
// Internal registers are ready immediately
assign reg_b_rdy_mux_in = 1'b1;
// Return an error if *no* read and *no* write was succesful. If some bits
// cannot be read/written but others are succesful, don't return and error
// Hence, as long as one action can be succesful, no error will be returned.
assign reg_b_err_mux_in = !((widget_if.r_vld && (widget_if.byte_en[0] || widget_if.byte_en[1])) || (widget_if.w_vld && (widget_if.byte_en[0] || widget_if.byte_en[1])));
// Read multiplexer
always_comb
begin
unique case (1'b1)
regfile_1__reg_c_active:
begin
widget_if.r_data = regfile_1__reg_c_data_mux_in;
widget_if.err = regfile_1__reg_c_err_mux_in;
widget_if.rdy = regfile_1__reg_c_rdy_mux_in;
end
regfile_1__reg_d_active:
begin
widget_if.r_data = regfile_1__reg_d_data_mux_in;
widget_if.err = regfile_1__reg_d_err_mux_in;
widget_if.rdy = regfile_1__reg_d_rdy_mux_in;
end
reg_a_active:
begin
widget_if.r_data = reg_a_data_mux_in;
widget_if.err = reg_a_err_mux_in;
widget_if.rdy = reg_a_rdy_mux_in;
end
reg_b_active:
begin
widget_if.r_data = reg_b_data_mux_in;
widget_if.err = reg_b_err_mux_in;
widget_if.rdy = reg_b_rdy_mux_in;
end
default:
begin
// If the address is not found, return an error
widget_if.r_data = 0;
widget_if.err = 1;
widget_if.rdy = widget_if.r_vld || widget_if.w_vld;
end
endcase
end
endmodule

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package enums__regfile_1_pkg;
typedef enum logic [1:0] {
val_7 = 2'd2,
val_8 = 2'd1
} fourth_enum;
endpackage

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package enums_pkg;
typedef enum logic [1:0] {
val_1 = 2'd2,
val_2 = 2'd1
} first_enum;
typedef enum logic [1:0] {
val_3 = 2'd2,
val_4 = 2'd1
} second_enum;
typedef enum logic [1:0] {
val_5 = 2'd2,
val_6 = 2'd1
} third_enum;
endpackage

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/*
* Copyright 2021 Dennis Potter <dennis@dennispotter.eu>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
module srdl2sv_amba3ahblite #(
parameter bit FLOP_REGISTER_IF = 0,
parameter BUS_BITS = 32,
parameter NO_BYTE_ENABLE = 0
)
(
// Bus protocol
input HCLK,
input HRESETn,
input HSEL,
input [31:0] HADDR,
input HWRITE,
input [ 2:0] HSIZE,
input [ 3:0] HPROT, // Might be used in the future together with an RDL UDP
input [ 1:0] HTRANS,
input [BUS_BITS-1:0] HWDATA,
output logic HREADYOUT,
output logic HRESP,
output logic [BUS_BITS-1:0] HRDATA,
// Interface to internal logic
srdl2sv_widget_if.widget widget_if
);
localparam BUS_BYTES = BUS_BITS/8;
localparam BUS_BYTES_W = $clog2(BUS_BYTES);
/***********************
* Define enums
***********************/
typedef enum logic [2:0] {
SINGLE = 3'b000,
INCR = 3'b001,
WRAP4 = 3'b010,
INCR4 = 3'b011,
WRAP8 = 3'b100,
INCR8 = 3'b101,
WRAP16 = 3'b110,
INCR16 = 3'b111
} HBURST_t;
typedef enum logic [1:0] {
IDLE = 2'b00,
BUSY = 2'b01,
NONSEQ = 2'b10,
SEQ = 2'b11
} HTRANS_t;
typedef enum logic {
OKAY = 1'b0,
ERROR = 1'b1
} HRESP_t;
typedef enum logic {
READ = 1'b0,
WRITE = 1'b1
} OP_t;
typedef enum logic [1:0] {
FSM_IDLE = 2'b00,
FSM_TRANS = 2'b01,
FSM_ERR_0 = 2'b10,
FSM_ERR_1 = 2'b11
} fsm_t;
/****************************
* Determine current address
****************************/
logic [31:0] HADDR_q;
logic [2:0] HSIZE_q;
OP_t operation_q;
wire addr_err = HADDR % (32'b1 << HSIZE) != 32'b0;
always_ff @ (posedge HCLK)
begin
case (HTRANS)
IDLE: ;// Do nothing
BUSY: ;// Do nothing
NONSEQ:
begin
// When a transfer is extended it has the side-effecxt
// of extending the address phase of the next transfer
if (HREADYOUT)
begin
HADDR_q <= HADDR;
HSIZE_q <= HSIZE;
operation_q <= HWRITE ? WRITE : READ;
end
end
SEQ:
begin
if (HREADYOUT)
begin
HADDR_q <= HADDR;
HSIZE_q <= HSIZE;
end
end
endcase
end
/****************************
* Statemachine
****************************/
logic [BUS_BITS-1:0] HRDATA_temp;
fsm_t fsm_next, fsm_q;
always_comb
begin
// Defaults
HREADYOUT = 1'b1;
HRESP = OKAY;
// When reading back, the data of the bit that was accessed over the bus
// should be at byte 0 of the HRDATA bus and bits that were not accessed
// should be masked with 0s.
HRDATA_temp = widget_if.r_data >> (8*HADDR_q[BUS_BYTES_W-1:0]);
for (int i = 0; i < BUS_BYTES; i++)
if (i < (1 << HSIZE_q))
HRDATA[8*(i+1)-1 -: 8] = HRDATA_temp[8*(i+1)-1 -: 8];
else
HRDATA[8*(i+1)-1 -: 8] = 8'b0;
widget_if_w_vld_next = 0;
widget_if_r_vld_next = 0;
fsm_next = fsm_q;
case (fsm_q)
default: // FSM_IDLE
begin
if (HSEL && HTRANS > BUSY)
begin
if (addr_err)
// In case the address is illegal, switch to an error state
fsm_next = FSM_ERR_0;
else if (HTRANS == NONSEQ)
// If NONSEQ, go to NONSEQ state
fsm_next = FSM_TRANS;
else if (HTRANS == SEQ)
// If a SEQ is provided, something is wrong
fsm_next = FSM_ERR_0;
end
end
FSM_TRANS:
begin
HREADYOUT = widget_if.rdy;
widget_if_w_vld_next = operation_q == WRITE;
widget_if_r_vld_next = operation_q == READ;
if (HTRANS == BUSY)
begin
// Wait
fsm_next = FSM_TRANS;
end
else if (widget_if.err && widget_if.rdy)
begin
HREADYOUT = 0;
HRESP = ERROR;
fsm_next = FSM_ERR_1;
end
else if (HTRANS == NONSEQ)
begin
// Another unrelated access is coming
fsm_next = FSM_TRANS;
end
else if (HTRANS == SEQ)
begin
// Another part of the burst is coming
fsm_next = FSM_TRANS;
end
else if (HTRANS == IDLE)
begin
// All done, wrapping things up!
fsm_next = widget_if.rdy ? FSM_IDLE : FSM_TRANS;
end
end
FSM_ERR_0:
begin
HREADYOUT = 0;
if (HTRANS == BUSY)
begin
// Slaves must always provide a zero wait state OKAY response
// to BUSY transfers and the transfer must be ignored by the slave.
HRESP = OKAY;
fsm_next = FSM_ERR_0;
end
else
begin
HRESP = ERROR;
fsm_next = FSM_ERR_1;
end
end
FSM_ERR_1:
begin
if (HTRANS == BUSY)
begin
// Slaves must always provide a zero wait state OKAY response
// to BUSY transfers and the transfer must be ignored by the slave.
HREADYOUT = 0;
HRESP = OKAY;
fsm_next = FSM_ERR_0;
end
else
begin
HREADYOUT = 1;
HRESP = ERROR;
fsm_next = FSM_IDLE;
end
end
endcase
end
always_ff @ (posedge HCLK or negedge HRESETn)
if (!HRESETn)
fsm_q <= FSM_IDLE;
else
fsm_q <= fsm_next;
/***
* Determine the number of active bytes
***/
logic [BUS_BYTES-1:0] HSIZE_bitfielded;
logic [BUS_BYTES-1:0] widget_if_byte_en_next;
logic widget_if_w_vld_next;
logic widget_if_r_vld_next;
generate
if (NO_BYTE_ENABLE)
begin
assign widget_if_byte_en_next = {BUS_BYTES{1'b1}};
end
else
begin
always_comb
begin
for (int i = 0; i < BUS_BYTES; i++)
HSIZE_bitfielded[i] = i < (1 << HSIZE_q);
// Shift if not the full bus is accessed
widget_if_byte_en_next = HSIZE_bitfielded << (HADDR_q % BUS_BYTES);
end
end
endgenerate
/***
* Drive interface to registers
***/
generate
if (FLOP_REGISTER_IF)
begin
always_ff @ (posedge HCLK or negedge HRESETn)
if (!HRESETn)
begin
widget_if.w_vld <= 1'b0;
widget_if.r_vld <= 1'b0;
end
else
begin
widget_if.w_vld <= widget_if_w_vld_next;
widget_if.r_vld <= widget_if_r_vld_next;
end
always_ff @ (posedge HCLK)
begin
widget_if.addr <= {HADDR_q[31:BUS_BYTES_W], {BUS_BYTES_W{1'b0}}};
widget_if.w_data <= HWDATA << (8*HADDR_q[BUS_BYTES_W-1:0]);
widget_if.byte_en <= widget_if_byte_en_next;
end
end
else
begin
assign widget_if.w_vld = widget_if_w_vld_next;
assign widget_if.r_vld = widget_if_r_vld_next;
assign widget_if.addr = {HADDR_q[31:BUS_BYTES_W], {BUS_BYTES_W{1'b0}}};
assign widget_if.w_data = HWDATA << (8*HADDR_q[BUS_BYTES_W-1:0]);
assign widget_if.byte_en = widget_if_byte_en_next;
end
endgenerate
endmodule

30
examples/enums/srdl2sv_out/srdl2sv_widget_if.sv Normal file
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@ -0,0 +1,30 @@
interface srdl2sv_widget_if #(
parameter ADDR_W = 32,
parameter DATA_W = 32
);
localparam DATA_BYTES = DATA_W >> 3;
logic [ADDR_W-1:0] addr;
logic [DATA_W-1:0] w_data;
logic w_vld;
logic r_vld;
logic [DATA_BYTES-1:0] byte_en;
logic [DATA_W-1:0] r_data;
logic rdy;
logic err;
modport widget (
output addr,
output w_data,
output w_vld,
output r_vld,
output byte_en,
input r_data,
input rdy,
input err
);
endinterface