PXS20RM Datasheet, PDF (545/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Fault Collection and Control Unit (FCCU)
In the FAULT state, the faulty logical state is indicated. In NORMAL or ALARM state, “no-faulty” state
is indicated. In Bi-stable mode the second output (FCCU_F[1]) is the inverted signal of first output
(FCCU_F[0]).
In the RESET phase the output pins are set as “high impedance”.
NOTE
Figure 22-43 is formatted to display the behavior in all four phases (reset,
normal, error, and config), not to imply transitions between one phase to
another. In particular, transition from error phase to config phase is not
possible.
Reset phase
or self-test
Normal phase
Error phase
Config phase
FCCU_F[0]
FCCU_F[1]
Input
or high-Z
Output
Figure 22-43. Bi-stable protocol
22.7.11 Fault mapping
Table 22-31 and Table 22-32 show the source of the fault signals and the type of fault input these signals
are connected to at the FCCU.
Table 22-31. FCCU mapping of critical faults
Critical fault
Source
Signal description
CF[0]
CF[1]
RCCUO[0]
RCCU1[0]
Cores out of lock
Cores out of lock
Short / long /
none default
func reset
Set /
clear
injection
NMI
Safe mode
request
Long
Long
Yes
Yes
Yes
Yes
Yes
Yes
CF[2]
RCCUO[1] DMA_MUXes out of lock
Long
Yes
Yes
Yes
CF[3]
RCCU1[1] DMA_MUXes out of lock
Long
Yes
Yes
Yes
CF[4]
RCCUO[2] PBRIDGEs out of lock
Long
Yes
Yes
Yes
CF[5]
RCCU1[2] PBRIDGEs out of lock
Long
Yes
Yes
Yes
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
22-45