supleed2/ELEC70056-HSV-CW2
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Fix GPIO assertions and test-bench coverage and constraints

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This commit is contained in:
Alden0012 2022-11-14 15:28:45 +00:00
parent f2b3a72a54
commit 128a2a9eaa
2 changed files with 179 additions and 157 deletions
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30
rtl/AHB_GPIO/AHBGPIO.sv
View file

@ -97,8 +97,10 @@ module AHBGPIO
// Update input value
always_ff @(posedge HCLK, negedge HRESETn)
if(!HRESETn)
if(!HRESETn) begin
gpio_datain <= 16'h0000;
gpio_parityerr <= '0;
end
else if (gpio_dir == 16'h0000) begin
gpio_datain <= GPIOIN[15:0];
gpio_parityerr <= ~^{GPIOIN,PARITYSEL,INJECT_FAULT};
@ -119,23 +121,23 @@ module AHBGPIO
assert_gpio_write: assert property
( @(posedge HCLK) disable iff (!HRESETn)
((gpio_dir == 16'h0001)
&& (HADDR[7:0] == gpio_data_addr)
((HADDR[7:0] == gpio_data_addr)
&& HSEL
&& HWRITE
&& HTRANS[1])
|-> (GPIOOUT[15:0] == $past(HWDATA[15:0], 1))
&& HTRANS[1]
&& HREADY) |-> ##1
(gpio_dir == 16'h0001) |-> ##1
(GPIOOUT[15:0] == $past(HWDATA[15:0], 1))
);
assert_gpio_read: assert property
( @(posedge HCLK) disable iff (!HRESETn)
((gpio_dir == 16'h0000)
&& (HADDR[7:0] == gpio_data_addr)
// && HSEL // HSEL not used in Read always_ff
&& !HWRITE
&& HTRANS[1])
|-> (HRDATA[15:0] == $past(GPIOIN[15:0], 1)
&& HREADYOUT)
&& HTRANS[1]
&& HREADY) |-> ##1
((HRDATA[15:0]==$past(GPIOIN[15:0],1)) && HREADYOUT)
);
assert_gpio_dir: assert property
@ -143,12 +145,14 @@ module AHBGPIO
((HADDR[7:0] == gpio_dir_addr)
&& HSEL
&& HWRITE
&& HTRANS[1])
|-> (gpio_dir == $past(HWDATA[15:0], 1))
&& HTRANS[1]
&& HREADY) |-> ##1
((HWDATA[7:0] == 8'h00 || HWDATA[7:0] == 8'h01)) ##1 (gpio_dir == $past(HWDATA[15:0], 1))
);
assume_initial_valid: assume
( gpio_dir == 16'h0000
assume_initial_valid: assume property
( @(posedge HCLK)
gpio_dir == 16'h0000
|| gpio_dir == 16'h0001
);

162
tbench/ahb_gpio_tb.sv
View file

@ -11,7 +11,7 @@ interface ahb_gpio_if;
logic HCLK;
logic HRESETn;
logic [31:0] HADDR;
logic [1:0] HTRANS;
logic [ 1:0] HTRANS;
logic [31:0] HWDATA;
logic HWRITE;
logic HSEL;
@ -19,138 +19,149 @@ interface ahb_gpio_if;
logic HREADYOUT;
logic [31:0] HRDATA;
logic [15:0] GPIOIN;
logic [15:0] GPIOOUT;
logic [16:0] GPIOIN;
logic [16:0] GPIOOUT;
modport DUT (input HCLK, HRESETn, HADDR, HTRANS, HWDATA, HWRITE, HSEL, HREADY, GPIOIN,
output HREADYOUT, HRDATA, GPIOOUT);
modport DUT
( input HCLK, HRESETn, HADDR, HTRANS, HWDATA, HWRITE, HSEL, HREADY, GPIOIN,
output HREADYOUT, HRDATA, GPIOOUT
);
modport TB (input HCLK, HREADYOUT, HRDATA, GPIOOUT,
output HRESETn, HREADY, HADDR, HTRANS, HWDATA, HWRITE, HSEL, GPIOIN);
modport TB
( input HCLK, HREADYOUT, HRDATA, GPIOOUT,
output HRESETn, HREADY, HADDR, HTRANS, HWDATA, HWRITE, HSEL, GPIOIN
);
endinterface
program automatic ahb_gpio_tb
(ahb_gpio_if.TB gpioif);
module ahb_gpio_tb;
localparam [7:0] gpio_data_addr = 8'h00;
localparam [7:0] gpio_dir_addr = 8'h04;
localparam max_test_count = 1000;
logic parity_sel = '0;
integer test_count;
class gpio_stimulus;
typedef enum bit[1:0] {
GPIO_WRITE = 2'b00,
GPIO_READ = 2'b01,
GPIO_DIR = 2'b10,
RANDOM = 2'b11
} stimulus_op;
rand stimulus_op gpio_op;
ahb_gpio_if gpioif();
AHBGPIO gpio(
.HCLK (gpioif.HCLK),
.HRESETn (gpioif.HRESETn),
.HADDR (gpioif.HADDR),
.HTRANS (gpioif.HTRANS),
.HWDATA (gpioif.HWDATA),
.HWRITE (gpioif.HWRITE),
.HSEL (gpioif.HSEL),
.HREADY (gpioif.HREADY),
.GPIOIN (gpioif.GPIOIN),
.PARITYSEL (parity_sel),
.INJECT_FAULT ('0),
.HREADYOUT (gpioif.HREADYOUT),
.HRDATA (gpioif.HRDATA),
.GPIOOUT (gpioif.GPIOOUT),
.PARITYERR ()
);
class gpio_stimulus;
rand logic HSEL;
rand logic HWRITE;
rand logic HREADY;
rand logic [1:0] HTRANS;
rand logic [ 1:0] HTRANS;
rand logic [31:0] HWDATA;
rand logic [31:0] HADDR;
rand logic [16:0] GPIOIN;
rand logic [15:0] GPIOIN;
logic [31:0] prev_haddr = '0;
constraint c_haddr {((gpio_op == GPIO_WRITE) && (HADDR == gpio_data_addr)) ||
((gpio_op == GPIO_DIR) && (HADDR == gpio_dir_addr)) ||
(gpio_op == GPIO_READ) ||
(gpio_op == RANDOM);}
constraint c_write {((gpio_op == GPIO_WRITE)|| (gpio_op == GPIO_DIR)) -> (HSEL && HWRITE && HREADY && (HTRANS == 2'b10));}
constraint c_hsel
{ HSEL dist { 1 :=99, 0:=1 }; }
constraint c_hready
{ HREADY dist { 1 :=99, 0:=1 }; }
constraint c_htrans
{ HTRANS dist { 2'b10 :=90, HTRANS :=10};}
constraint c_haddr
{ HSEL -> HADDR dist {gpio_data_addr:=40, gpio_dir_addr:=40, HADDR:=20};}
constraint c_gpio_dir_write
{
(prev_haddr[7:0]==gpio_dir_addr) -> (HWDATA==32'h0000 || HWDATA ==32'h0001);
}
constraint c_gpioin_parity
{ GPIOIN[16] == ~^{GPIOIN[15:0],parity_sel};}
constraint c_read {(gpio_op == GPIO_READ) -> (HSEL && !HWRITE && HREADY);}
function void post_randomize;
prev_haddr = HADDR;
endfunction
endclass
gpio_stimulus stimulus_vals;
covergroup cover_addr_values;
coverpoint gpioif.HADDR {
covergroup cover_ahb_transaction_vals;
cp_hsel: coverpoint gpioif.HSEL{
bins hi = {1};
bins lo = {0};
}
cp_hready: coverpoint gpioif.HREADY{
bins hi = {1};
bins lo = {0};
}
cp_hwrite: coverpoint gpioif.HWRITE{
bins write = {1};
bins read = {0};
}
cp_haddr: coverpoint gpioif.HADDR {
bins data_addr = {gpio_data_addr};
bins dir_addr = {gpio_dir_addr};
bins invalid_addr = default;
}
endgroup
covergroup cover_wr_vals;
coverpoint {HSEL,HWRITE,HREADY} {
bins write = {{1,1,1}};
bins read = {{1,0,1}};
bins invalid = default;
cp_ahb_transaction: cross cp_hsel, cp_hready, cp_hwrite, cp_haddr {
bins ahb_write = cp_ahb_transaction with (cp_hsel==1 && cp_hready==1 && cp_hwrite==1 && cp_haddr==gpio_data_addr);
bins ahb_read = cp_ahb_transaction with (cp_hsel==1 && cp_hready==1 && cp_hwrite==0);
bins ahb_dir = cp_ahb_transaction with (cp_hsel==1 && cp_hready==1 && cp_hwrite==1 && cp_haddr==gpio_dir_addr);
ignore_bins ignore_invalid = cp_ahb_transaction with (cp_hsel!=1);
}
endgroup
covergroup cover_ahb_write_values;
coverpoint gpioif.HWDATA {
bins zero = {0};
bins lo = {[1:7]};
bins med = {[8:23]};
bins hi = {[24:30]};
bins max = {32'hFFFF};
}
coverpoint gpioif.HWDATA;
endgroup
covergroup cover_ahb_read_values;
coverpoint gpioif.HRDATA {
bins zero = {0};
bins lo = {[1:7]};
bins med = {[8:23]};
bins hi = {[24:30]};
bins max = {32'hFFFF};
}
coverpoint gpioif.HRDATA;
endgroup
covergroup cover_gpio_in_values;
coverpoint gpioif.GPIOIN {
bins zero = {0};
bins lo = {[1:4]};
bins med = {[5:9]};
bins high = {[10:14]};
bins max = {16'hFF};
}
coverpoint gpioif.GPIOIN;
endgroup
covergroup cover_gpio_out_values;
coverpoint gpioif.GPIOOUT {
bins zero = {0};
bins lo = {[1:4]};
bins med = {[5:9]};
bins high = {[10:14]};
bins max = {16'hFF};
}
coverpoint gpioif.GPIOOUT;
endgroup
task deassert_reset();
begin
gpioif.HRESETn = 0;
@(posedge gpioif.HCLK);
@(posedge gpioif.HCLK);
gpioif.HRESETn = 1;
@(posedge gpioif.HCLK);
end
endtask
initial begin
cover_addr_values covaddr;
cover_ahb_write_values covahbwrite;
cover_ahb_read_values covahbread;
cover_gpio_in_values covgpioin;
cover_gpio_out_values covgpioout;
covaddr = new();
cover_ahb_transaction_vals covahbtransactionvals;
covahbwrite = new();
covahbread = new();
covgpioin = new();
covgpioout = new();
covahbtransactionvals = new();
stimulus_vals = new();
deassert_reset();
for(test_count = 0; test_count < max_test_count;test_count++)
begin
@(posedge gpioif.HCLK);
assert (stimulus_vals.randomize) else $fatal;
gpioif.HSEL = stimulus_vals.HSEL;
gpioif.HWRITE = stimulus_vals.HWRITE;
@ -160,13 +171,20 @@ program automatic ahb_gpio_tb
gpioif.HADDR = stimulus_vals.HADDR;
gpioif.GPIOIN = stimulus_vals.GPIOIN;
covaddr.sample();
covahbwrite.sample();
covgpioin.sample();
covahbread.sample();
covgpioout.sample();
covahbtransactionvals.sample();
@(posedge gpioif.HCLK);
end
@(posedge gpioif.HCLK);
$finish;
end
endprogram
initial begin
gpioif.HCLK = 0;
forever #1 gpioif.HCLK = ! gpioif.HCLK;
end
endmodule