System Host Board Description

SHB Express System Host Board [PCI Express], is also called SHBe. The mother board supports a removable System Host Board [SHB] in addition to other I/O boards. The SHB is produced as a full length or short form factor. Both board types support x16 and x8 PCI Express lanes with a bandwidth of 10GB/s. SHB Express is used as an industrial embedded computer system [PICMG 1.3]. The board-to-backplane interfaces are PCI Express instead of PCI and ISA found in PICMG 1.0 standard, although the use of PCI remains as an option. PICMG 1.1 was a PCI to PCI bridging specification, which define a form factor and backplane connector layout for PCI-PCI bridge boards. While PICMG 1.2 was a PCI only specification which defined a system with either two PCI/PCI-X busses or a single PCI/PCI-X bus.
In the PICMG 1.0 series of specifications the backplane or motherboard is passive, the intelligence is contained on the plug-in board that mount to the backplane.

SHB Express cards are produced in two different form factors; a Full Size board 338.582mm x 126.390mm, and a Half Size board 167.64mm x 126.390mm
The half-size board is shown above holding the A and B connectors, which carry the PCIe signals and power and ground. The C and D connectors which carry the PCI-X signals and additional I/O and power appear on the full size board. The passive backplane which is also not shown would support one System Host Board, having an expansion slot to support one SHB, with a number of other expansion slots to support normal card add-ons.

System Host Board Manufacturers

Advantech {13-slot SHB backplane for 14-slot Chassis, PCIe (x1, x4, x 8, or x16), and 64-bit/32-bit PCI slots}

Chassis Plans {Manufacture PICMG 1.0 (1.1, etc) and 1.3 Single Board Computers and System Host Boards.}

Trenton Technology Inc. {Dual Intel Processor SHB Express Board}

The SHB Express standard was released in 2005 as;
SHB Express, System Host Board PCI Express Specification

Editor note; A number of board specifications did the exact same thing as PICMG 1.3. That is, when a particular specification was up-dated to add the PCI-express bus, the ISA interface was dropped. However at the same time the addition of the PCI interfaced was allowed as an option. These revisions came at a time when the original IBM ISA interface was obsolete and replaced by the PCI bus years before. Now with the introduction of the PCIe interface the new standard would support PCIe and be backwards compatible with the PCI bus; instead of being a PCI bus and be backwards compatible with the ISA bus.

So the new standard was PCIe & PCI, and not PCI & ISA. Of course a new standard was required to introduce the PCIe bus into the interface and at the same time remove the ISA bus from the interface.

Personal Computer Mother-Board
System Host Board

Larry's Web Page

Electronic Parts and Equipment Distributors Electronic Component Manufacturers OEM Electronic Equipment Manufacturers EDA Software Producers CAD/CAE Software Engineering Standards, EE Publications Interface/Embedded Computer Bus Electronic Engineering Design Data Engineering Reference Information.
DistributorsComponents Equipment Software Standards Buses Design Reference
Modified 7/17/2015
Copyright © 1998 - 2016 All rights reserved Larry Davis