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D602 - PowerPC Safe Computer

6U CompactPCI The D602 is a 6U CompactPCI COTS computer with onboard functional safety that realizes triple redundancy on a single board to achieve fail-operational, fault-tolerant behavior.

Petr Chalupa

Odolné PC, Military, TEMPEST, Doprava +420 251 614 073 pchalupa@nowatron.cz

Poptat řešení

Základní informace Specifikace Blokové schéma Volitelné Fotogalerie Ke stažení

Základní informace

Main Features

3x PowerPC 750 (lockstep mode), 3x 512 MB DDR RAM
Fail-operational, fault-tolerant behavior
Fail-safe and fail-silent board architecture
Clustering of two D602 to raise availability
Board management, BITE
SEU (radiation) tolerant
Certifiable up to SIL 4 (with report from T? Sd) and DAL-A
Developed according to RTCA DO-254, EN 50129 and IEC 61508
EN 50155 compliance
Up to -40 to +70C with qualified components
Convection or conduction cooling

Specifikace

Technical Data

CPU

3x PowerPC 750 CL
- Scalable performance
- 1 GHz processor core frequency
- Superscalar
- Classic PowerPC FPU, MMU
- CPU bus to FPGA: 100-MHz/64-bit
Lock-step operation
- All CPUs do the same thing at the same time
- 2-out-of-3 voting in FPGA with CPU bus clock speed (100MHz)
- Software-assisted resynchronization
- No functional interruption in case of an SEU inside the CPU
Chipset
- North- and Southbridge realized in FPGA

Memory

2x 32 kB L1 cache, 1MB L2 cache integrated in each CPU
3 independent ranks of 512MB DDR SDRAM system memory, FPGA-controlled
- 100MHz memory bus frequency (32 bit)
- Up to 800 MB/s
- 2-out-of-3 voting in FPGA
- Scrubbing to prevent accumulation of SEU
- No functional interruption in case of an SEU inside the memory
2 independent ranks of 256MB Flash, FPGA-controlled
- Primary and backup Flash ranks contain the same data, auto-selection by boot loader
- ECC protection
1MB FRAM
- ECC protection
4KB serial EEPROM for production data (serial number etc.)

I/O

All I/O realized in FPGA and available at rear I/O
Sextuple UART
- E.g., for communication with other D602
- Data rates up to 460,800 Baud for each channel
- Handshake lines: none
RS232 UART
- Data rates up to 460,800 Baud
- 2x 256 Byte transmit/receive buffer
- Handshake lines: none
PCI bus
I²C bus

Mezzanine Slots

Two PMC slots

32 bit/33 MHz, 3.3V V(I/O)
PMC slot 1 with rear I/O (revisions -02 and later)

Miscellaneous

Voltage monitoring
Temperature monitoring
Watchdog
Reset signal control
Control of redundant power supplies
Sleep mode
- Lowers power consumption in case of primary power supply interruption
- Power failure indicated through signals from backplane
- Supports power interruptions specified in Airbus directive ABD0100.1.9
- CPUs and memory can be put into sleep mode
Redundant clock generation
Connection with second D602 possible (with special backplane)
- Control of shared outputs
- Exchange of state information
- BMC and 6x UART link

CompactPCI Bus

Compliance with CompactPCI Core Specification PICMG 2.0 R3.0
System slot
32-bit/33-MHz PCI-to-PCI bridge
V(I/O): +3.3V

Electrical Specifications

Dual power input from CompactPCI bus, uninterrupted (EN50155, Class S1)
- 3.3V (-5%/+5%)
- 5V (-3%/+5%)
- Standard backplane supplies both input rails with power
- Continued operation if one power input fails (or is not present)
- Separate power supplies for the three CPUs and the three main memory ranks
Supply voltage/power consumption:
- 30W
- 15W in sleep mode

Mechanical Specifications

Dimensions: conforming to CompactPCI specification for 6U boards
Front panel: 4HP with ejector
Weight: 640g (with heat sink)

Environmental Specifications

Temperature range (operation):
- 1-slot models: -40..+55°C (qualified components), temperature classes T1, T2, and TX inside buildings, or in containers with temperature control for signalling equipment, according to EN 50125-3, table 2
- 2-slot models: -40..+70°C (qualified components), temperature classes T1, T2, and T3 for equipment onboard rolling stock, according to EN 50125-1, table 2
- Airflow: min. 2 m/s
Temperature range (storage): -40..+85°C
Relative humidity (operation): max. 95% non-condensing
Relative humidity (storage): max. 95% non-condensing
Altitude: -300m to +2,000m (EN50124, Class AX)
Compliant to EN50125-1, meeting requirements of EN61373, Cat. 1, Class B and Classes GTX, GL3 for rolling stock
- Shock: 50 m/s², 30 ms (EN 61373)
- Vibration (function): 1 m/s², 5 Hz - 150 Hz (EN 61373)
- Vibration (lifetime): 7.9 m/s², 5 Hz - 150 Hz (EN 61373)
For signalling equipment, a distance of 3m from the track bed is required
Protection class IP00 (EN50124, Category PD1)
Conformal coating on request
All components soldered

MTBF

46 000 h @ 40°C according to MIL.HDBK-217FN2 with modifications.
- Weighted mean figure for 65% operation in AIC (air inhabited cargo) and 35% operation in GF (ground fixed) conditions
312 437 h @ 40°C according to IEC/TR 62380 (RDF 2000)
430 705 h for continuous operation @ 25°C according to IEC/TR 62380 (RDF 2000)

Safety

Erroneous behavior of CPU/memory subsystem < 1E-8/h
- Considering hardware failures and worst-case SEU environment
PCB manufactured with a flammability rating of 94V-0 by UL recognized manufacturers

EMC Conformity