HAPP001
Understanding the New Revision of the
CompactPCI Core Specification:
PICMG 2.0 R3.0
Application
Note
Hybricon Corporation • 12 Willow Road • Ayer, Massachusetts 01432
Tel: (978) 772-5422 • Fax: (978) 772-2963
Web: www.hybricon.com • E-Mail: info@hybricon.com
1999 Hybricon Corporation
www.PICMG.com
HAPP001
Understanding the New Revision of the CompactPCI Core Specification: PICMG 2.0 R3.0
Understanding the New Revision of the CompactPCI
Core Specification: PICMG 2.0 R3.0
Robert C. Sullivan
Hybricon Corporation
1 Introduction
PICMG 2.0 Revision 3.0 was adopted by PICMG on October 1, 1999. This revision supersedes
PICMG 2.0 R2.1, providing a number of new features, and presenting some migration issues that
the user must be aware of.
For complete information, you can obtain a copy of PICMG 2.0 R3.0 from the PCI Industrial
Computer Manufacturers Group (PICMG); for information on how to order specifications, see
www.picmg.org.
2 Key New Features in PICMG 2.0 R3.0
• Adopt Hot Swap pin sequencing and dedicated (non-shared) clocks.
• Adopt Type AB rear shrouds for RP3 and RP5 to improve rear transition module
alignment, along with Rear Transition Module connectors J3 and J5.
• Allow Hot Swap support for 3.3V V(I/O) in addition to 5V V(I/O).
• Provide 66 MHz support for up to 5 slots with 3.3V V(I/O).
• Provide signals for future implementation of System Management Bus, in anticipation of
PICMG 2.9 Secondary System Management Bus Specification.
• Allow relaxed peripheral board stub length to 2.5 inches to allow routing of 64-bit cards.
• Allow mix of 64-bit and 32-bit operation in a single platform.
• Allow the option to selectively tie logic ground to frame ground via the CompactPCI card
front panels to provide flexibility in system integration for applications with differing
grounding practices.
• Protect systems via adoption of the PICMG 2.10 Keying Specification.
• Discourage use of backplane JTAG signals; these pins will be redefined at a later date.
3 PICMG 2.0 R3.0 CompactPCI Backplane and Enclosure Impacts
• Non-Hot Swap PICMG 2.0 R2.1 backplanes become obsolete.
• Existing non-hot-swap P1 connector (per PICMG 2.0 R2.1 ) and combo P1/P2 connectors
(per PICMG 2.0 R2.1 ) become obsolete.
• PICMG 2.0 R2.1 backplanes without Geographic Addressing become obsolete.
CompactPCI and PICMG are registered trademarks of the PCI Industrial Computer
Manufacturers Group
Hybricon Corporation • 12 Willow Road • Ayer, Massachusetts 01432
Tel: (978) 772-5422 • Fax: (978) 772-2963
Web: http://www.hybricon.com • E-Mail: info@hybricon.com
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HAPP001
Understanding the New Revision of the CompactPCI Core Specification: PICMG 2.0 R3.0
• Add new 66MHz bus signal, M66EN (GND for 33 MHz). Hybricon backplanes use a
jumper to configure 33/66MHz. Only 5 slots and lower are supported at 66 MHz.
• Add Hot swap signals HEALTHY# and 64EN# (per PICMG 2.1 R1.0)
• Widen backplane trace for System Management Bus power signal.
• Requires V(I/O) current carrying capacity of 4A per slot on backplane.
• Tighten up backplane clock trace length matching to 160 mm +/- 1mm for 66MHz.
• Requires Hot Swap P1 connector pin staging on backplane.
• Requires Type AB rear shrouds for RP3, RP5 on backplane.
• Requires red card guide for system slot (was previously optional).
• Refers to PICMG 2.11 (new specification) for In-Rack power connections.
• Require lower card guide ESD discharge clips.
• Requires backplane connector keys and IEEE 1101.10 card guide keys per PICMG 2.10
Keying Specification.
4 PICMG 2.0 R3.0 CompactPCI System Slot Card and Peripheral
Card Impacts
• Revision 1.0 CPU’s that do not drive CLK5 and CLK6 become obsolete; all 7 clocks
must be driven.
• Tighten up system slot card clock timing to +/- 0.8 ns for 66MHz.
• Tighten up peripheral card clock trace length matching to 63.5 mm +/- 1mm for 66MHz.
• Only one PCI load is allowed on system slot card for 66MHz.
• Allows relaxation of peripheral card stub length to 2.5 inches to allow routing of 64-bit
cards.
• Tighten up system slot pullups to +/-5%.
• Revised system slot card pullup requirements on a number of additional signals (PRST#,
DEG#, FAL#, INTP).
• Require support for 64EN# signal on 64-bit peripheral cards.
• Require bottom edge ESD discharge strips on all system slot and peripheral cards.
• Allow the option to selectively tie logic ground to frame ground via the CompactPCI card
front panels to provide flexibility in system integration for applications with differing
grounding practices.
• Requires system slot and peripheral card connector keys and IEEE 1101.10 front panel
keys per PICMG 2.10 Keying Specification.
5 PICMG 2.0 R3.0 CompactPCI Rear Transition Module Impacts
• Rear Transition Modules require use of Type AB connectors for J3, J5.
Hybricon Corporation • 12 Willow Road • Ayer, Massachusetts 01432
Tel: (978) 772-5422 • Fax: (978) 772-2963
Web: http://www.hybricon.com • E-Mail: info@hybricon.com
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HAPP001
Understanding the New Revision of the CompactPCI Core Specification: PICMG 2.0 R3.0
6 Availability
• Hybricon offers CompactPCI • Product is in production and is
backplanes and enclosures that available from stock
conform to PICMG 2.0 R3.0
Hybricon Corporation • 12 Willow Road • Ayer, Massachusetts 01432
Tel: (978) 772-5422 • Fax: (978) 772-2963
Web: http://www.hybricon.com • E-Mail: info@hybricon.com
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