what's the matter in file test.v ?

attempting to place a value change callback

Today i write a simple module "test.v" with verilog. when i run simulation with ncverilog, it can't dump fsdb file. why?

The following are test.v and .log file.
1) test.v
module test();
reg clock, reset;
wire out1;

initial begin
clock =0;
reset = 1;
#2990;
reset = 0;
end

always #100 clock = !clock;

test1 test1 (
.clk (clock),
.rst (reset),
.out (out1)
);


initial begin
$fsdbDumpfile ("test_bench.fsdb");
$fsdbDumpvars (test);

end

endmodule


module test1 (
clk,
out,
rst
);

input clk;
input rst;
output out;

reg out;

always @(posedge rst or posedge clk)
begin
if (rst)
out <= 1'b0;
else
out <= #3 1'b0;
end

endmodule

2) log file
ncverilog: 05.10-p004: (c) Copyright 1995-2003 Cadence Design Systems, Inc.
TOOL: ncverilog 05.10-p004: Started on Oct 19, 2006 at 09:30:48
ncverilog
test.v
-l
ncverilog.log
Recompiling... reason: file './test.v' is newer than expected.
expected: Thu Oct 19 09:29:54 2006
actual: Thu Oct 19 09:30:42 2006
file: test.v
module worklib.test:v
errors: 0, warnings: 0
Caching library 'worklib' ....... Done
Elaborating the design hierarchy:
Building instance overlay tables: .................... Done
Generating native compiled code:
worklib.test:v <0x0e726cc3>
streams: 2, words: 678
Loading native compiled code: .................... Done
Building instance specific data structures.
Design hierarchy summary:
Instances Unique
Modules: 2 2
Registers: 3 3
Scalar wires: 2 -
Always blocks: 2 2
Initial blocks: 2 2
Writing initial simulation snapshot: worklib.test:v
Loading snapshot worklib.test:v .................... Done
ncsim> source /usr/tools/cadence/ldv/tools/inca/files/ncsimrc
ncsim> run
Debussy Release 5.2v13 (Linux) NC-Verilog - 09/24/2002 compile
FSDB file test_bench.fsdb is created
Start dumping scope test, layer 0
ERROR: ACC VISNOC
Attempting to place a value change callback on test.out1 which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOC
Attempting to place a value change callback on test.clock which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOC
Attempting to place a value change callback on test.reset which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOC
Attempting to place a value change callback on test.test1.clk which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOC
Attempting to place a value change callback on test.test1.rst which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOC
Attempting to place a value change callback on test.test1.out which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.out1 which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.out1 which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.out1 which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.clock which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.clock which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.clock which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.reset which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.reset which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.reset which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.test1.clk which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.test1.clk which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.test1.clk which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.test1.out which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.test1.out which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.test1.out which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.test1.rst which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.test1.rst which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
ERROR: ACC VISNOR
Attempting to read from test.test1.rst which does not have read access.
./test.v, 31: $fsdbDumpvars(test)
End of dumping
ncsim: *W,RNQUIE: Simulation is complete.
ncsim> exit
TOOL: ncverilog 05.10-p004: Exiting on Oct 19, 2006 at 09:30:48 (total: 00:00:00)

Thanks for you take time to read and reply.

David

attempting to place a value change callback on

hi quan228228,

I faced the same problem before with ncverilog. Please try the command below:

ncverilog test.v test1.v +ncelabargs+"-access +r" |run.log

Hope it helps,
-no_mad