PEB 2091
PEF 2091
Operational Description
4.4
State Machines
4.4.1
State Machine Notation Rules
The state machine includes all information necessary for the user to understand and
predict the activation/deactivation status of the IEC-Q. The information contained in a
state bubble is:
– State name
– U-signal transmitted
– Overhead bits transmitted
– C/I-code transmitted
– Transition criteria
– Timers
IN
Signal Transmitted
to U-Interface
(general)
Single Bit
Transmitted
to U-Interface
State Name
Indication Transmitted on C/I-Channel
(DD)
ITD04257
OUT
Figure 71
State Diagram Notation
The following example explains the use of a state diagram by an extract of the LT state
diagram. The state explained is the "Deactivated" state in LT mode.
The state may be entered by either of three methods:
– From state "Receive Reset" after time T7 has expired (T7 Expired)
– From state "Tear Down" after the internal transition criterion "LSU" is fulfilled
– From state "Test" after the C/I-command "DR" has been sent downstream
The following information is transmitted:
– SL0 is sent on the U-interface (no signal, see "U-Interface Signals", page 125)
– No overhead bits are sent
– C/I-message "DI" is issued on upstream
The state may be left by either of the following methods:
Semiconductor Group
145
Data Sheet 01.99
INFINEON [ Infineon ]
