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SPXN2010VLQ120R Datasheet(PDF) 7 Page - Freescale Semiconductor, Inc

Part # SPXN2010VLQ120R
Description  32-bit Power Architecture짰 Microcontrollers for Highly Reliable
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

SPXN2010VLQ120R Datasheet(HTML) 7 Page - Freescale Semiconductor, Inc

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Features
PXS20 Product Brief, Rev. 1
Freescale Semiconductor
7
— Selectable pull-up, pull-down or no pull on all pins on all SIU controlled pins
— Selectable open drain
Redundant temperature sensors in separate safety channels
Multiple low/high voltage detector and inhibit units
— High voltage detection and inhibit with off-line testing capability on 1.2 V only
— Low voltage detection and inhibit with off-line testing capability on 1.2 V and 3.3 V supply
Redundant bandgap to duplicate internal reference
Deep N-well and wide column multiplexing where required to reduce Soft error rate (SER) effect
for SRAM
Physical separation of replicated functional blocks achieved by layout
2.4
Modes of Operation
PXS20 devices can operate in two modes of operation:
Lock Step Mode (LSM)
Decoupled Parallel Mode (DPM)
One of the two modes is statically selected at power-up. The selected mode may be changed only going
through a full power-on reset.
2.4.1
Lock Step Mode (LSM)
Lock Step Mode (LSM) allows reaching the highest safety level. It has been defined to allow reaching
SIL3 with minimum software overhead.
The Sphere of Replication (SoR) refers to a set of replicated IP modules where at the outputs a formal
check is performed to ensure that the same operations or transactions are executed on a clock per clock
basis (Lock Step Mode of operation).
The current concept assumes as premise that the most important goal for a functional safety SIL3-capable
device is to detect (or diagnose) faults as they leave the SoR. In fact, a fault as long as it remains confined
within the SoR and therefore will not generate an action visible outside the SoC or influence the effective
operability of the periphery (and so the ECU), is not to be considered as a dangerous fault.
The presence of checkers (RC) at the outputs of the SoR for the periphery bus, the flash-memory
subsystem and the SRAM subsystem represents a minimum guarantee that non-common cause faults are
detected when the two channels redundantly are merged into a single actuator or recipient, on the action
that is to be performed.
2.4.2
Decoupled Parallel Mode (DPM)
In Decoupled Parallel Mode (DPM) , each CPU core and connected channel run independently from the
other one and redundancy checkers (RC) are disabled.


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