2 modules

[pat]

i have 2 modules.
one i call 'main'
one is called 'counter' which is instantiated in main.

main has...
clk input
counter_input
[7:0] output

counter has...
clk input
counter output

(i am using xilinx web pack verilog design (not schematic design)

i instantiate counter in main sending it clk only. inside counter i
have always @(posedge clk) counter <= counter + 1;

in main, i...
also have the same clk.
what i am looking to do is have the output of counter go into the input
of main.

i tried wire, assign and a bunch of other stuff.

this is what i am thinking
1. counter and main are in sink cause they use the same clk.
2. is my counter value lost when i go out of instantiated counter?
3. if need be i can cut/paste my two modules

thanks

 

[John_H]

pat,

What do you want to accomplish? Is your confusion on how to interface two
modules? If so, you need to either instantiate one module in the other (
like calling a subroutine from within a root C program called "main") or you
need to instantiate both module in another top module. The counter module
can have an "output [7:0] counter;" and a "reg [7:0] counter;" which will
make the clocked counter value available to the Verilog module that
instantiated the counter module.

Typically there is much more to a module than just a counter but many
engineers use small, proven modules for their own reasons.


"pat" <me@here.com> wrote in message
newsan.2004.09.08.01.16.41.305429@here.com...

i have 2 modules.
one i call 'main'
one is called 'counter' which is instantiated in main.

main has...
clk input
counter_input
[7:0] output

counter has...
clk input
counter output

(i am using xilinx web pack verilog design (not schematic design)

i instantiate counter in main sending it clk only. inside counter i
have always @(posedge clk) counter <= counter + 1;

in main, i...
also have the same clk.
what i am looking to do is have the output of counter go into the input
of main.

i tried wire, assign and a bunch of other stuff.

this is what i am thinking
1. counter and main are in sink cause they use the same clk.
2. is my counter value lost when i go out of instantiated counter?
3. if need be i can cut/paste my two modules

thanks