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Add simple example with 1-D, 2-D, and 3-D registers

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Dennis Potter 2021-10-20 22:34:37 -07:00
parent 2da71dabf1
commit 1ed801a565
Signed by: Dennis
GPG Key ID: 186A8AD440942BAF
4 changed files with 859 additions and 0 deletions
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27
examples/simple_rw_reg/simple_rw_reg.rdl Normal file
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// This RDL file contains 4 simple types of registers:
// - A 1-dimensional register
// - A 2-dimensional register
// - A 3-dimensional register
//
// Note that no reset is defined, so none of the registers will be
// resetable.
addrmap simple_rw_reg {
// 1-D register
reg {
field {sw=rw; hw=rw; we;} f1 [15:0];
field {sw=rw; hw=rw; we;} f2 [31:16];
} register_1d;
// 2-D register
reg {
field {sw=rw; hw=rw; we;} f1 [15:0];
field {sw=rw; hw=rw; we;} f2 [31:16];
} register_2d[2];
// 3-D register
reg {
field {sw=rw; hw=rw; we;} f1 [15:0];
field {sw=rw; hw=rw; we;} f2 [31:16];
} register_3d[2][2];
};

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examples/simple_rw_reg/srdl2sv_out/simple_rw_reg.sv Normal file
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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://git.dennispotter.eu/Dennis/srdl2sv/issues
*
* ===GENERATION INFORMATION======================================
*
* Generation information:
* - User: : dpotter
* - Time : October 20 2021 22:32:15
* - Path : /home/dpotter/srdl2sv_second_repo/examples/simple_rw_reg
* - RDL file : ['simple_rw_reg.rdl']
* - Hostname : ArchXPS
*
* RDL include directories:
* -
*
* Commandline arguments to srdl2sv:
* - Ouput Directory : ./srdl2sv_out
* - Stream Log Level : WARNING
* - File Log Level : INFO
* - Use Real Tabs : False
* - Tab Width : 4
* - Enums Enabled : True
* - Register Bus Type: amba3ahblite
* - Byte enables : True
* - Descriptions : {'AddrMap': False, 'RegFile': False, 'Memory': False, 'Register': False, 'Field': False}
*
* ===LICENSE OF SIMPLE_RW_REG.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 simple_rw_reg
import srdl2sv_if_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 logic register_1d__f1_hw_wr,
input logic [15:0] register_1d__f1_in ,
input logic register_1d__f2_hw_wr,
input logic [15:0] register_1d__f2_in ,
input logic register_2d__f1_hw_wr[2],
input logic [15:0] register_2d__f1_in [2],
input logic register_2d__f2_hw_wr[2],
input logic [15:0] register_2d__f2_in [2],
input logic register_3d__f1_hw_wr[2][2],
input logic [15:0] register_3d__f1_in [2][2],
input logic register_3d__f2_hw_wr[2][2],
input logic [15:0] register_3d__f2_in [2][2],
// Outputs
output HREADYOUT ,
output HRESP ,
output [32-1:0] HRDATA ,
output logic [15:0] register_1d__f1_r,
output logic [15:0] register_1d__f2_r,
output logic [15:0] register_2d__f1_r[2],
output logic [15:0] register_2d__f2_r[2],
output logic [15:0] register_3d__f1_r[2][2],
output logic [15:0] register_3d__f2_r[2][2]
);
// Internal signals
b2r_t b2r;
r2b_t r2b;
/*******************************************************************
* AMBA 3 AHB Lite Widget
* ======================
* Naming conventions
* - r2b.* -> Signals from registers to bus
* - b2r.* -> Signals from bus to 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
(// Outputs to internal logic
.b2r,
// Inputs from internal logic
.r2b,
// Bus protocol
.HRESETn,
.HCLK (clk),
.HADDR,
.HWRITE,
.HSIZE,
.HPROT,
.HTRANS,
.HWDATA,
.HSEL,
.HREADYOUT,
.HRESP,
.HRDATA);
genvar gv_a, gv_b;
/*******************************************************************
/*******************************************************************
/* REGISTER : register_1d
/* DIMENSION : 0
/* DEPTHS (per dimension): []
/*******************************************************************
/*******************************************************************/
logic register_1d_active ;
logic register_1d_sw_wr ;
logic [31:0] register_1d_data_mux_in;
logic register_1d_rdy_mux_in ;
logic register_1d_err_mux_in ;
logic [15:0] register_1d__f1_q ;
logic [15:0] register_1d__f2_q ;
// Register-activation for 'register_1d'
assign register_1d_active = b2r.addr == 0;
assign register_1d_sw_wr = register_1d_active && b2r.w_vld;
//-----------------FIELD SUMMARY-----------------
// name : f1 (register_1d[15:0])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : {'we', 'sw'}
// external : False
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (register_1d_sw_wr)
begin
if (b2r.byte_en[0])
register_1d__f1_q[7:0] <= b2r.data[7:0];
if (b2r.byte_en[1])
register_1d__f1_q[15:8] <= b2r.data[15:8];
end
else
if (register_1d__f1_hw_wr)
register_1d__f1_q <= register_1d__f1_in;
end // of register_1d__f1's always_ff
// Connect register to hardware output port
assign register_1d__f1_r = register_1d__f1_q;
//-----------------FIELD SUMMARY-----------------
// name : f2 (register_1d[31:16])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : {'we', 'sw'}
// external : False
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (register_1d_sw_wr)
begin
if (b2r.byte_en[2])
register_1d__f2_q[7:0] <= b2r.data[23:16];
if (b2r.byte_en[3])
register_1d__f2_q[15:8] <= b2r.data[31:24];
end
else
if (register_1d__f2_hw_wr)
register_1d__f2_q <= register_1d__f2_in;
end // of register_1d__f2's always_ff
// Connect register to hardware output port
assign register_1d__f2_r = register_1d__f2_q;
/**************************************
* Assign all fields to signal to Mux *
**************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign register_1d_data_mux_in = {register_1d__f2_q, register_1d__f1_q};
// Internal registers are ready immediately
assign register_1d_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 register_1d_err_mux_in = !((b2r.r_vld && (b2r.byte_en[0] || b2r.byte_en[1] || b2r.byte_en[2] || b2r.byte_en[3])) || (b2r.w_vld && (b2r.byte_en[0] || b2r.byte_en[1] || b2r.byte_en[2] || b2r.byte_en[3])));
/*******************************************************************
/*******************************************************************
/* REGISTER : register_2d
/* DIMENSION : 1
/* DEPTHS (per dimension): [2]
/*******************************************************************
/*******************************************************************/
logic register_2d_active [2];
logic register_2d_sw_wr [2];
logic [31:0] register_2d_data_mux_in[2];
logic register_2d_rdy_mux_in [2];
logic register_2d_err_mux_in [2];
logic [15:0] register_2d__f1_q [2];
logic [15:0] register_2d__f2_q [2];
generate
for (gv_a = 0; gv_a < 2; gv_a++)
begin
// Register-activation for 'register_2d'
assign register_2d_active[gv_a] = b2r.addr == 4+(gv_a*4);
assign register_2d_sw_wr[gv_a] = register_2d_active[gv_a] && b2r.w_vld;
//-----------------FIELD SUMMARY-----------------
// name : f1 (register_2d[15:0])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : {'we', 'sw'}
// external : False
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (register_2d_sw_wr[gv_a])
begin
if (b2r.byte_en[0])
register_2d__f1_q[gv_a][7:0] <= b2r.data[7:0];
if (b2r.byte_en[1])
register_2d__f1_q[gv_a][15:8] <= b2r.data[15:8];
end
else
if (register_2d__f1_hw_wr[gv_a])
register_2d__f1_q[gv_a] <= register_2d__f1_in[gv_a];
end // of register_2d__f1's always_ff
// Connect register to hardware output port
assign register_2d__f1_r[gv_a] = register_2d__f1_q[gv_a];
//-----------------FIELD SUMMARY-----------------
// name : f2 (register_2d[31:16])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : {'we', 'sw'}
// external : False
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (register_2d_sw_wr[gv_a])
begin
if (b2r.byte_en[2])
register_2d__f2_q[gv_a][7:0] <= b2r.data[23:16];
if (b2r.byte_en[3])
register_2d__f2_q[gv_a][15:8] <= b2r.data[31:24];
end
else
if (register_2d__f2_hw_wr[gv_a])
register_2d__f2_q[gv_a] <= register_2d__f2_in[gv_a];
end // of register_2d__f2's always_ff
// Connect register to hardware output port
assign register_2d__f2_r[gv_a] = register_2d__f2_q[gv_a];
/**************************************
* Assign all fields to signal to Mux *
**************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign register_2d_data_mux_in[gv_a] = {register_2d__f2_q[gv_a], register_2d__f1_q[gv_a]};
// Internal registers are ready immediately
assign register_2d_rdy_mux_in[gv_a] = 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 register_2d_err_mux_in[gv_a] = !((b2r.r_vld && (b2r.byte_en[0] || b2r.byte_en[1] || b2r.byte_en[2] || b2r.byte_en[3])) || (b2r.w_vld && (b2r.byte_en[0] || b2r.byte_en[1] || b2r.byte_en[2] || b2r.byte_en[3])));
end // of for loop with iterator gv_a
endgenerate
/*******************************************************************
/*******************************************************************
/* REGISTER : register_3d
/* DIMENSION : 2
/* DEPTHS (per dimension): [2][2]
/*******************************************************************
/*******************************************************************/
logic register_3d_active [2][2];
logic register_3d_sw_wr [2][2];
logic [31:0] register_3d_data_mux_in[2][2];
logic register_3d_rdy_mux_in [2][2];
logic register_3d_err_mux_in [2][2];
logic [15:0] register_3d__f1_q [2][2];
logic [15:0] register_3d__f2_q [2][2];
generate
for (gv_a = 0; gv_a < 2; gv_a++)
begin
for (gv_b = 0; gv_b < 2; gv_b++)
begin
// Register-activation for 'register_3d'
assign register_3d_active[gv_a][gv_b] = b2r.addr == 12+(gv_a*8+gv_b*4);
assign register_3d_sw_wr[gv_a][gv_b] = register_3d_active[gv_a][gv_b] && b2r.w_vld;
//-----------------FIELD SUMMARY-----------------
// name : f1 (register_3d[15:0])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : {'we', 'sw'}
// external : False
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (register_3d_sw_wr[gv_a][gv_b])
begin
if (b2r.byte_en[0])
register_3d__f1_q[gv_a][gv_b][7:0] <= b2r.data[7:0];
if (b2r.byte_en[1])
register_3d__f1_q[gv_a][gv_b][15:8] <= b2r.data[15:8];
end
else
if (register_3d__f1_hw_wr[gv_a][gv_b])
register_3d__f1_q[gv_a][gv_b] <= register_3d__f1_in[gv_a][gv_b];
end // of register_3d__f1's always_ff
// Connect register to hardware output port
assign register_3d__f1_r[gv_a][gv_b] = register_3d__f1_q[gv_a][gv_b];
//-----------------FIELD SUMMARY-----------------
// name : f2 (register_3d[31:16])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : {'we', 'sw'}
// external : False
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (register_3d_sw_wr[gv_a][gv_b])
begin
if (b2r.byte_en[2])
register_3d__f2_q[gv_a][gv_b][7:0] <= b2r.data[23:16];
if (b2r.byte_en[3])
register_3d__f2_q[gv_a][gv_b][15:8] <= b2r.data[31:24];
end
else
if (register_3d__f2_hw_wr[gv_a][gv_b])
register_3d__f2_q[gv_a][gv_b] <= register_3d__f2_in[gv_a][gv_b];
end // of register_3d__f2's always_ff
// Connect register to hardware output port
assign register_3d__f2_r[gv_a][gv_b] = register_3d__f2_q[gv_a][gv_b];
/**************************************
* Assign all fields to signal to Mux *
**************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign register_3d_data_mux_in[gv_a][gv_b] = {register_3d__f2_q[gv_a][gv_b], register_3d__f1_q[gv_a][gv_b]};
// Internal registers are ready immediately
assign register_3d_rdy_mux_in[gv_a][gv_b] = 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 register_3d_err_mux_in[gv_a][gv_b] = !((b2r.r_vld && (b2r.byte_en[0] || b2r.byte_en[1] || b2r.byte_en[2] || b2r.byte_en[3])) || (b2r.w_vld && (b2r.byte_en[0] || b2r.byte_en[1] || b2r.byte_en[2] || b2r.byte_en[3])));
end // of for loop with iterator gv_b
end // of for loop with iterator gv_a
endgenerate
// Read multiplexer
always_comb
begin
unique case (1'b1)
register_1d_active:
begin
r2b.data = register_1d_data_mux_in;
r2b.err = register_1d_err_mux_in;
r2b.rdy = register_1d_rdy_mux_in;
end
register_2d_active[0]:
begin
r2b.data = register_2d_data_mux_in[0];
r2b.err = register_2d_err_mux_in[0];
r2b.rdy = register_2d_rdy_mux_in[0];
end
register_2d_active[1]:
begin
r2b.data = register_2d_data_mux_in[1];
r2b.err = register_2d_err_mux_in[1];
r2b.rdy = register_2d_rdy_mux_in[1];
end
register_3d_active[0][0]:
begin
r2b.data = register_3d_data_mux_in[0][0];
r2b.err = register_3d_err_mux_in[0][0];
r2b.rdy = register_3d_rdy_mux_in[0][0];
end
register_3d_active[0][1]:
begin
r2b.data = register_3d_data_mux_in[0][1];
r2b.err = register_3d_err_mux_in[0][1];
r2b.rdy = register_3d_rdy_mux_in[0][1];
end
register_3d_active[1][0]:
begin
r2b.data = register_3d_data_mux_in[1][0];
r2b.err = register_3d_err_mux_in[1][0];
r2b.rdy = register_3d_rdy_mux_in[1][0];
end
register_3d_active[1][1]:
begin
r2b.data = register_3d_data_mux_in[1][1];
r2b.err = register_3d_err_mux_in[1][1];
r2b.rdy = register_3d_rdy_mux_in[1][1];
end
default:
begin
// If the address is not found, return an error
r2b.data = 0;
r2b.err = 1;
r2b.rdy = b2r.r_vld || b2r.w_vld;
end
endcase
end
endmodule

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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
import srdl2sv_if_pkg::*;
#(
parameter bit FLOP_REGISTER_IF = 0,
parameter BUS_BITS = 32,
parameter NO_BYTE_ENABLE = 0
)
(
// Outputs to internal logic
output b2r_t b2r,
// Inputs from internal logic
input r2b_t r2b,
// 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
);
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 = 1'b0;
// 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 = r2b.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;
b2r_w_vld_next = 0;
b2r_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 = r2b.rdy;
b2r_w_vld_next = operation_q == WRITE;
b2r_r_vld_next = operation_q == READ;
if (r2b.err && r2b.rdy)
begin
fsm_next = FSM_ERR_0;
end
else if (HTRANS == BUSY)
begin
// Wait
fsm_next = FSM_TRANS;
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 = r2b.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] b2r_byte_en_next;
logic b2r_w_vld_next;
logic b2r_r_vld_next;
generate
if (NO_BYTE_ENABLE)
begin
assign b2r_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
b2r_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
b2r.w_vld <= 1'b0;
b2r.r_vld <= 1'b0;
end
else
begin
b2r.w_vld <= b2r_w_vld_next;
b2r.r_vld <= b2r_r_vld_next;
end
always_ff @ (posedge HCLK)
begin
b2r.addr <= {HADDR_q[31:BUS_BYTES_W], {BUS_BYTES_W{1'b0}}};
b2r.data <= HWDATA << (8*HADDR_q[BUS_BYTES_W-1:0]);
b2r.byte_en <= b2r_byte_en_next;
end
end
else
begin
assign b2r.w_vld = b2r_w_vld_next;
assign b2r.r_vld = b2r_r_vld_next;
assign b2r.addr = {HADDR_q[31:BUS_BYTES_W], {BUS_BYTES_W{1'b0}}};
assign b2r.data = HWDATA << (8*HADDR_q[BUS_BYTES_W-1:0]);
assign b2r.byte_en = b2r_byte_en_next;
end
endgenerate
endmodule

18
examples/simple_rw_reg/srdl2sv_out/srdl2sv_if_pkg.sv Normal file
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package srdl2sv_if_pkg;
typedef struct packed { // .Verilator does not support unpacked structs in packages
logic [31:0] addr;
logic [31:0] data;
logic w_vld;
logic r_vld;
logic [ 3:0] byte_en;
} b2r_t;
typedef struct packed { // .Verilator does not support unpacked structs in packages
logic [31:0] data;
logic rdy;
logic err;
} r2b_t;
endpackage