Problem with H,Z and inout signals

[Giox]

Hello everybody,
I have a little problem with my VHDL code.

I have a situation like the following one:

pinout/signal_a <--> block_1/signal_b <--> block_2/signal_c

where <--> indicate an inout port.

The code looks something like that:

signal_a <= local_signal

And on the module that has signal_b as output I put:
signal_b => local_signal


During simulation I obtain that when signal_a is H (the expected
result), while signal_b and signal_c are Z, while when the signal_a is
0, signal_b and signal_c are coherent.
The Z value is put on the signal_c by the block_2 and propagated to
signal_b, while signal_a is connected to a pullup and forced to the
value H when it is not 0.
Reading the VHDL standard I found out that the resolution functions
imposes that when the same line is drove by H and Z the resulting
signal is H.
Is there something I'm missing?
The signals are of type std_logic/std_logic_vector (signal_a is a
single wire of a std_logic_vector). Any help will be appreciated.
Gio.

 

[Mike Treseler]

Giox wrote:

Is there something I'm missing?
I don't understand the question.

Post your code.
Here is a sim example that tests a tri-state node:
http://home.comcast.net/~mike_treseler/oe_demo.vhd

-- Mike Treseler