Provided by:
alliance_5.0-20110203-4_i386 
NAME
ctl - Control Temporal Logic file format.
DESCRIPTION
This document describes the CTL file format used by moka(1) for model
checking of finite states machine description.
This CTL file format subset is defined to enable classical CTL formulae
description.
A CTL file is made of two parts: a declaration part and a formulae
statement part.
The declaration part described types, constants, macros and all
variables used in CTL formulae. It also describes assumption
conditions and initial conditions that have to be applied by moka(1)
during the model checking.
The formulae statement part described all the CTL formulae that have to
be verified.
All boolean and relational VHDL operators are supported (see vbe(5))
and also the 8 CTL operators AF, AG, AX, AU, EF, EG, EX and EU. The CTL
file format support also the imply boolean operator '->' and the
equivalence operator '<=>'.
EXAMPLE
-- user type definition
TYPE A_ETAT_TYPE IS (A_E0, A_E1);
TYPE B_ETAT_TYPE IS (B_E0, B_E1);
-- variables definition
VARIABLE A_NS, A_CS : A_ETAT_TYPE;
VARIABLE B_NS, B_CS : B_ETAT_TYPE;
VARIABLE ck : BIT;
VARIABLE data_in : BIT;
VARIABLE data_out : BIT;
VARIABLE reset : BIT;
VARIABLE ack : BIT;
VARIABLE req : BIT;
-- example of a macros definition
DEFINE def1 : BOOLEAN := ack='1';
-- the assigned value can be a constant
DEFINE c1 : BIT := '1';
-- the assumption condition
ASSUME ass1 := (reset='0');
-- the initial reset condition
-- be careful, the assumption condition is not applied
-- to the initial conditions.
RESET_COND init1 := (reset='1');
-- It is also possible to describe the first state
-- with the INITIAL keywork, as follows:
--
-- INITIAL init1 := ((A_CS=A_E0) AND (B_CS=B_E0));
--
-- formulae description statement part
begin
prop1 : EX( ack='1' );
prop2 : AG( req -> AF( ack ) );
prop4 : AU( req='1', ack='1');
end;
SEE ALSO
moka(1)