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bufif and nmos/pmos are strength aware 

The outputs to bufif and nmos/pmos devices are always strength-aware,
so should have their outputs connected to a net8 device.

Signed-off-by: Stephen Williams <steve@icarus.com>
This commit is contained in:
Stephen Williams 2007-09-22 21:53:55 -07:00
parent a0cbd235d6
commit 14c0cfd3b1
1 changed files with 26 additions and 3 deletions
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29
tgt-vvp/vvp_scope.c
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@ -749,6 +749,31 @@ static void draw_modpath(const char*label, const char*driver,
free(con_drivers);
}
static int nexus_drive_is_strength_aware(ivl_nexus_ptr_t nptr)
{
if (ivl_nexus_ptr_drive0(nptr) != IVL_DR_STRONG)
return 1;
if (ivl_nexus_ptr_drive1(nptr) != IVL_DR_STRONG)
return 1;
ivl_net_logic_t log = ivl_nexus_ptr_log(nptr);
if (log != 0) {
/* These logic gates are able to generate unusual
strength values and so their outputs are considered
strength aware. */
if (ivl_logic_type(log) == IVL_LO_BUFIF0)
return 1;
if (ivl_logic_type(log) == IVL_LO_BUFIF1)
return 1;
if (ivl_logic_type(log) == IVL_LO_PMOS)
return 1;
if (ivl_logic_type(log) == IVL_LO_NMOS)
return 1;
}
return 0;
}
/*
* This function draws the input to a net into a string. What that
* means is that it returns a static string that can be used to
@ -832,9 +857,7 @@ static char* draw_net_input_x(ivl_nexus_t nex,
/* Mark the strength-aware flag if the driver can
generate values other than the standard "6"
strength. */
if (ivl_nexus_ptr_drive0(nptr) != IVL_DR_STRONG)
nex_flags |= VVP_NEXUS_DATA_STR;
if (ivl_nexus_ptr_drive1(nptr) != IVL_DR_STRONG)
if (nexus_drive_is_strength_aware(nptr))
nex_flags |= VVP_NEXUS_DATA_STR;
/* Save this driver. */