PXS20RM Datasheet, PDF (1261/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Self-Test Control Unit (STCU)
When an STCU Reset Event occurs, the device goes through a two-phase boot sequence:
1. Self-test phase: See Figure 42-2.
2. Functional-reset phase: See Figure 42-3.
STCU Reset
Event
FCCU
Failures
SSCM
2
Read
Parameters
1
6
Detect Status
3
Load
Parameters
NVM
STCU
MC_RGM
Done
7
LBIST Partitions
Run Tests
5
MBIST Partitions
Run Tests
4
1. After an STCU Reset Event, the SSCM detects that the device self test has not been
run yet.
2. The SSCM reads the self-test parameters from flash nonvolatile memory (NVM).
3. The SSCM loads the self-test parameters into the STCU and passes control over to the
STCU.
4. The STCU manages the MBISTs and updates its internal status.
5. The STCU manages the LBISTs and updates its internal status.
6. If faults are detected, the STCU reports the test failures to the FCCU.
7. The STCU signals the MC_RGM that the tests are complete, and the boot sequence
proceeds to the next phase (see Figure 42-3).
Note: All steps described in the box above are executed only after (not before) the MC_RGM is in IDLE phase.
Figure 42-2. Boot sequence phase 1: Self test
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
42-3