Problem with single bit slv

[salman sheikh]

Hello,

I am creating a generic width latch. When using it to create a single
bit, I run into elaboration warnings in Modelsim (which may give problem
during synthesis, I suspect? The problem seems to be when instantiating
a single bit latch standard logic_vector (0 downto 0) and connecting
signals from a higher level that are signals of std_logic. It seems to
me that it would be a real pain to change all the higher level signals
to slv(0 downto 0) or another pain is to create a separate single bit
(non-generic) latch component for those places where needed. Any
suggested solutions to make this warning go away?

Thanks in advance for any help.


Salman Sheikh

 

[Just an Illusion]

Hi Salman,

Your error is certainly link to mismatch of type (std_logic <>
std_logic_vector).
When you call your module, first convert your std_logic into an
std_logic_vector.
To do use std_logic_arith and function conv_std_logic_vector.

Bye,
JaI


salman sheikh wrote:

Hello,

I am creating a generic width latch. When using it to create a single
bit, I run into elaboration warnings in Modelsim (which may give
problem during synthesis, I suspect? The problem seems to be when
instantiating a single bit latch standard logic_vector (0 downto 0)
and connecting signals from a higher level that are signals of
std_logic. It seems to me that it would be a real pain to change all
the higher level signals to slv(0 downto 0) or another pain is to
create a separate single bit (non-generic) latch component for those
places where needed. Any suggested solutions to make this warning go
away?

Thanks in advance for any help.


Salman Sheikh

 

[Allan Herriman]

On Fri, 02 Jul 2004 09:50:44 -0400, salman sheikh
<sheikh@pop500.gsfc.nasa.gov> wrote:

Hello,

I am creating a generic width latch. When using it to create a single
bit, I run into elaboration warnings in Modelsim (which may give problem
during synthesis, I suspect? The problem seems to be when instantiating
a single bit latch standard logic_vector (0 downto 0) and connecting
signals from a higher level that are signals of std_logic. It seems to
me that it would be a real pain to change all the higher level signals
to slv(0 downto 0) or another pain is to create a separate single bit
(non-generic) latch component for those places where needed. Any
suggested solutions to make this warning go away?

you seem to be trying this in your port map:

slv_port => sl_signal,

and it's not working because of the type clash.

Instead, try this:

slv_port(0) => sl_signal,

Regards,
Allan.