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Constant assignments to outputs 

If the Verilog source contained a continuous assignment
of a constant to an output, it would not be present in
the VHDL output. This patch generates a VHDL continous
assignment in these cases.
This commit is contained in:
Nick Gasson 2008-07-13 13:02:17 +01:00
parent 3bd480a375
commit 27a40cfdcd
1 changed files with 17 additions and 3 deletions
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20
tgt-vhdl/scope.cc
View File

@ -278,8 +278,21 @@ static void declare_signals(vhdl_entity *ent, ivl_scope_t scope)
(new vhdl_port_decl(name.c_str(), sig_type, VHDL_PORT_IN)); (new vhdl_port_decl(name.c_str(), sig_type, VHDL_PORT_IN));
break; break;
case IVL_SIP_OUTPUT: case IVL_SIP_OUTPUT:
ent->get_scope()->add_decl {
(new vhdl_port_decl(name.c_str(), sig_type, VHDL_PORT_OUT)); vhdl_port_decl *decl =
new vhdl_port_decl(name.c_str(), sig_type, VHDL_PORT_OUT);
// Check for constant values
// For outputs these must be continuous assigns of
// the constant to the port
vhdl_expr *init = nexus_to_const(ivl_signal_nex(sig, 0));
if (init != NULL) {
vhdl_var_ref *ref = new vhdl_var_ref(name.c_str(), NULL);
ent->get_arch()->add_stmt(new vhdl_cassign_stmt(ref, init));
}
ent->get_scope()->add_decl(decl);
}
if (ivl_signal_type(sig) == IVL_SIT_REG) { if (ivl_signal_type(sig) == IVL_SIT_REG) {
// A registered output // A registered output
@ -292,7 +305,8 @@ static void declare_signals(vhdl_entity *ent, ivl_scope_t scope)
rename_signal(sig, newname.c_str()); rename_signal(sig, newname.c_str());
vhdl_type *reg_type = new vhdl_type(*sig_type); vhdl_type *reg_type = new vhdl_type(*sig_type);
ent->get_arch()->get_scope()->add_decl(new vhdl_signal_decl(newname.c_str(), reg_type)); ent->get_arch()->get_scope()->add_decl
(new vhdl_signal_decl(newname.c_str(), reg_type));
// Create a concurrent assignment statement to // Create a concurrent assignment statement to
// connect the register to the output // connect the register to the output