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Add example with aliases

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Dennis Potter 2021-11-06 22:47:47 -07:00
parent 0887372dbd
commit f81cae107d
Signed by: Dennis
GPG Key ID: 186A8AD440942BAF
5 changed files with 905 additions and 0 deletions
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examples/aliases/Makefile Normal file
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RTL_TARGETS = $(subst .rdl,.sv,srdl2sv_out/$(shell ls *.rdl))
.PHONY: clean
default: verilog_compile
verilog_compile: $(RTL_TARGETS)
verilator -cc -sv $(shell ls srdl2sv_out/*.sv)
srdl2sv_out/%.sv: %.rdl $(shell which srdl2sv)
srdl2sv $< --out-dir $(shell dirname $@) --stdout-logging INFO -d 31
clean:
rm -rf srdl2sv_out

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examples/aliases/aliases.rdl Normal file
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addrmap aliases {
///////////////////////////
// Example SystemRDL LRM //
///////////////////////////
reg some_intr_r {
desc = "This register shows the alias example from Section 10.5.2 of the
SystemRDL2.0 spec (with some slight adaptations to make it compilable).";
field {
level intr;
hw=w;
sw=rw;
woclr;
} some_event;
};
some_intr_r event1;
// Create an alias for the DV team to use and modify its properties
// so that DV can force interrupt events and allow more rigorous structural
// testing of the interrupt.
alias event1 some_intr_r event1_for_dv;
event1_for_dv.some_event->woset = true;
//////////////////////////
// Example field-subset //
//////////////////////////
field field_templ {
sw = rw;
hw = rw;
wel;
};
reg four_field_reg {
desc = "This is a register with 4 fields.";
field_templ f1 [7:0];
field_templ f2 [15:8];
field_templ f3 [23:16];
field_templ f4 [31:24];
f3->swmod = true; // swmod does work for aliased registers
f4->rclr = true; // Show rclr feature
};
reg two_field_alias {
desc = "It is not mandatory that aliases have all fields of the original
register. A subset of the fields can be made accessible and they
can have different names.";
field_templ field_1 [7:0];
// Removed f2
// Removed f3
field_templ field_4 [31:24];
field_4->woclr = true; // Different option compared to four_field_reg.f1
};
four_field_reg four_field_reg; // Actual register
alias four_field_reg two_field_alias two_field_alias; // Alias with different properties
};

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examples/aliases/srdl2sv_out/aliases.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://github.com/Silicon1602/srdl2sv/issues
*
* ===GENERATION INFORMATION======================================
*
* Generation information:
* - User: : dpotter
* - Time : November 06 2021 22:46:49
* - Path : /home/dpotter/srdl2sv/examples/aliases
* - RDL file : ['aliases.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
* - Address Errors : True
* - Unpacked I/Os : True
* - Register Bus Type: amba3ahblite
* - Address width : 32
* - Byte enables : True
* - Descriptions : {'AddrMap': True, 'RegFile': True, 'Memory': True, 'Register': True, 'Field': True}
*
* ===LICENSE OF ALIASES.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 aliases
(
// 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 [0:0] event1__some_event_in ,
input four_field_reg__f1_hw_wr,
input [7:0] four_field_reg__f1_in ,
input four_field_reg__f2_hw_wr,
input [7:0] four_field_reg__f2_in ,
input four_field_reg__f3_hw_wr,
input [7:0] four_field_reg__f3_in ,
input four_field_reg__f4_hw_wr,
input [7:0] four_field_reg__f4_in ,
// Outputs
output HREADYOUT ,
output HRESP ,
output [32-1:0] HRDATA ,
output event1_intr ,
output [7:0] four_field_reg__f1_r ,
output [7:0] four_field_reg__f2_r ,
output [7:0] four_field_reg__f3_r ,
output reg four_field_reg__f3_swmod,
output [7:0] four_field_reg__f4_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);
/*******************************************************************
/*******************************************************************
/* REGISTER : event1
/* DIMENSION : 0
/* DEPTHS (per dimension): []
/*******************************************************************
/*******************************************************************/
/**REGISTER DESCRIPTION*********************************************
This register shows the alias example from Section 10.5.2 of the
SystemRDL2.0 spec (with some slight adaptations to make it compilable).
/*******************************************************************/
logic event1_active ;
logic event1_sw_wr ;
logic event1_for_dv_active ;
logic event1_for_dv_sw_wr ;
logic [31:0] event1_data_mux_in ;
logic event1_rdy_mux_in ;
logic event1_err_mux_in ;
logic [31:0] event1_for_dv_data_mux_in ;
logic event1_for_dv_rdy_mux_in ;
logic event1_for_dv_err_mux_in ;
logic [0:0] event1__some_event_sticky_latch;
logic [0:0] event1__some_event_q ;
// Register-activation for 'event1'
assign event1_active = widget_if.addr == 0;
assign event1_sw_wr = event1_active && widget_if.w_vld;
// Register-activation for 'event1_for_dv' (alias)
assign event1_for_dv_active = widget_if.addr == 4;
assign event1_for_dv_sw_wr = event1_for_dv_active && widget_if.w_vld;
//-----------------FIELD SUMMARY-----------------
// name : some_event (event1[0:0])
// access : hw = w
// sw = rw (precedence)
// reset : - / -
// flags : ['intr', 'intr type', 'sw', 'woclr']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (event1_sw_wr)
begin
if (widget_if.byte_en[0]) // woclr property
event1__some_event_q[0:0] <= event1__some_event_q[0:0] & ~widget_if.w_data[0:0];
end
else
if (event1_for_dv_sw_wr)
begin
if (widget_if.byte_en[0]) // woset property
event1__some_event_q[0:0] <= event1__some_event_q[0:0] | widget_if.w_data[0:0];
end
else
begin
for (int i = 0; i < 1; i++)
begin
if (event1__some_event_sticky_latch[i])
begin
// Stickybit. Keep value until software clears it
event1__some_event_q[i] <= 1'b1;
end
end
end
end // of event1__some_event's always_ff
// Define signal that causes the interrupt to be set (level-type interrupt)
assign event1__some_event_sticky_latch = event1__some_event_in;
/**************************************
* Register contains interrupts *
**************************************/
// Register has at least one interrupt field
assign event1_intr = |(event1__some_event_q);
/**********************************************
* Assign all fields to signal to Mux *
**********************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign event1_data_mux_in = {{31{1'b0}}, event1__some_event_q};
// Internal registers are ready immediately
assign event1_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 event1_err_mux_in = !((widget_if.r_vld && (widget_if.byte_en[0])) || (widget_if.w_vld && (widget_if.byte_en[0])));
/**********************************************
* Assign all fields to signal to Mux (alias) *
**********************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign event1_for_dv_data_mux_in = {{31{1'b0}}, event1__some_event_q};
// Internal registers are ready immediately
assign event1_for_dv_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 event1_for_dv_err_mux_in = !((widget_if.r_vld && (widget_if.byte_en[0])) || (widget_if.w_vld && (widget_if.byte_en[0])));
/*******************************************************************
/*******************************************************************
/* REGISTER : four_field_reg
/* DIMENSION : 0
/* DEPTHS (per dimension): []
/*******************************************************************
/*******************************************************************/
/**REGISTER DESCRIPTION*********************************************
This is a register with 4 fields.
/*******************************************************************/
logic four_field_reg_active ;
logic four_field_reg_sw_wr ;
logic two_field_alias_active ;
logic two_field_alias_sw_wr ;
logic four_field_reg__any_alias_sw_wr;
logic [31:0] four_field_reg_data_mux_in ;
logic four_field_reg_rdy_mux_in ;
logic four_field_reg_err_mux_in ;
logic [31:0] two_field_alias_data_mux_in ;
logic two_field_alias_rdy_mux_in ;
logic two_field_alias_err_mux_in ;
logic [7:0] four_field_reg__f1_q ;
logic [7:0] four_field_reg__f2_q ;
logic [7:0] four_field_reg__f3_q ;
logic [7:0] four_field_reg__f4_q ;
// Register-activation for 'four_field_reg'
assign four_field_reg_active = widget_if.addr == 8;
assign four_field_reg_sw_wr = four_field_reg_active && widget_if.w_vld;
// Register-activation for 'two_field_alias' (alias)
assign two_field_alias_active = widget_if.addr == 12;
assign two_field_alias_sw_wr = two_field_alias_active && widget_if.w_vld;
// Combined register activation. These will become active on
// access via any of the alias registers.
assign four_field_reg__any_alias_sw_wr = four_field_reg_sw_wr || two_field_alias_sw_wr;
//-----------------FIELD SUMMARY-----------------
// name : f1 (four_field_reg[7:0])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw', 'wel']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (four_field_reg_sw_wr)
begin
if (widget_if.byte_en[0])
four_field_reg__f1_q[7:0] <= widget_if.w_data[7:0];
end
else
if (two_field_alias_sw_wr)
begin
if (widget_if.byte_en[0])
four_field_reg__f1_q[7:0] <= widget_if.w_data[7:0];
end
else
if (!four_field_reg__f1_hw_wr)
four_field_reg__f1_q <= four_field_reg__f1_in;
end // of four_field_reg__f1's always_ff
// Connect register to hardware output port
assign four_field_reg__f1_r = four_field_reg__f1_q;
//-----------------FIELD SUMMARY-----------------
// name : f2 (four_field_reg[15:8])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw', 'wel']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (four_field_reg_sw_wr)
begin
if (widget_if.byte_en[1])
four_field_reg__f2_q[7:0] <= widget_if.w_data[15:8];
end
else
if (!four_field_reg__f2_hw_wr)
four_field_reg__f2_q <= four_field_reg__f2_in;
end // of four_field_reg__f2's always_ff
// Connect register to hardware output port
assign four_field_reg__f2_r = four_field_reg__f2_q;
//-----------------FIELD SUMMARY-----------------
// name : f3 (four_field_reg[23:16])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw', 'wel', 'swmod']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (four_field_reg_sw_wr)
begin
if (widget_if.byte_en[2])
four_field_reg__f3_q[7:0] <= widget_if.w_data[23:16];
end
else
if (!four_field_reg__f3_hw_wr)
four_field_reg__f3_q <= four_field_reg__f3_in;
end // of four_field_reg__f3's always_ff
// Connect register to hardware output port
assign four_field_reg__f3_r = four_field_reg__f3_q;
// Combinational block to generate swmod-output signals
always_comb
begin
four_field_reg__f3_swmod = 0;
four_field_reg__f3_swmod |= four_field_reg__any_alias_sw_wr && |widget_if.byte_en[2:2];
end
//-----------------FIELD SUMMARY-----------------
// name : f4 (four_field_reg[31:24])
// access : hw = rw
// sw = rw (precedence)
// reset : - / -
// flags : ['sw', 'wel', 'rclr']
// external : False
// storage type : StorageType.FLOPS
//-----------------------------------------------
always_ff @(posedge clk)
begin
if (four_field_reg_sw_wr)
begin
if (widget_if.byte_en[3])
four_field_reg__f4_q[7:0] <= widget_if.w_data[31:24];
end
else
if (two_field_alias_sw_wr)
begin
if (widget_if.byte_en[3]) // woclr property
four_field_reg__f4_q[7:0] <= four_field_reg__f4_q[7:0] & ~widget_if.w_data[31:24];
end
else
if (!four_field_reg__f4_hw_wr)
four_field_reg__f4_q <= four_field_reg__f4_in;
end // of four_field_reg__f4's always_ff
// Connect register to hardware output port
assign four_field_reg__f4_r = four_field_reg__f4_q;
/**********************************************
* Assign all fields to signal to Mux *
**********************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign four_field_reg_data_mux_in = {four_field_reg__f4_q, four_field_reg__f3_q, four_field_reg__f2_q, four_field_reg__f1_q};
// Internal registers are ready immediately
assign four_field_reg_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 four_field_reg_err_mux_in = !((widget_if.r_vld && (|widget_if.byte_en[3:0])) || (widget_if.w_vld && (|widget_if.byte_en[3:0])));
/**********************************************
* Assign all fields to signal to Mux (alias) *
**********************************************/
// Assign all fields. Fields that are not readable are tied to 0.
assign two_field_alias_data_mux_in = {four_field_reg__f4_q, {16{1'b0}}, four_field_reg__f1_q};
// Internal registers are ready immediately
assign two_field_alias_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 two_field_alias_err_mux_in = !((widget_if.r_vld && (widget_if.byte_en[3] || widget_if.byte_en[0])) || (widget_if.w_vld && (widget_if.byte_en[3] || widget_if.byte_en[0])));
// Read multiplexer
always_comb
begin
unique case (1'b1)
event1_active:
begin
widget_if.r_data = event1_data_mux_in;
widget_if.err = event1_err_mux_in;
widget_if.rdy = event1_rdy_mux_in;
end
event1_for_dv_active:
begin
widget_if.r_data = event1_for_dv_data_mux_in;
widget_if.err = event1_for_dv_err_mux_in;
widget_if.rdy = event1_for_dv_rdy_mux_in;
end
four_field_reg_active:
begin
widget_if.r_data = four_field_reg_data_mux_in;
widget_if.err = four_field_reg_err_mux_in;
widget_if.rdy = four_field_reg_rdy_mux_in;
end
two_field_alias_active:
begin
widget_if.r_data = two_field_alias_data_mux_in;
widget_if.err = two_field_alias_err_mux_in;
widget_if.rdy = two_field_alias_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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/*
* 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/aliases/srdl2sv_out/srdl2sv_widget_if.sv Normal file
View File

@ -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