What are ISM™ & SUMIT™
What is ISM™?
ISM™, short for Industry Standard Module™, is a pure
90mm x 96mm form factor (compatible with PC/104)
that addresses shortcomings of existing small form
factors:
• Fitting circuitry without extending beyond the board
outline.
• Meeting top-and bottom-side component height
restrictions.
• Decoupling form factors from expansion interfaces.
• Enabling exible expansion bus and I/O
connectorization.
• Allowing bus combinations that were previously
undened and unnamed.
SBC manufacturers have struggled to t modern
legacy-free platforms onto small form factors without
protruding beyond the allowed board outlines with
“wings”. With the ISA bus, serial ports, and even the
PCI bus no longer integrated into low power chipsets,
it takes extra circuitry to meet the needs of many
embedded applications.
What is included in the specification?
The ISM™ Specication denes the board size, four xed mounting
holes, component height limits, and exible “expansion zones” for I/O
and/or bus connectors. The xed corner mounting holes allow re-use
of enclosures without modications in the future.
What interfaces are allowed?
ISM™ allows many combinations of bus and I/O connectors as long
as those interfaces reside within the dened “expansion zones”.
ISM™ also offers a choice of using right-angle connectors that
overhang the board edges, or extending the circuit board if vertical /
non-overhang connectors are used.
What architectures are allowed?
ISM™ boards can be SBCs, stackable CPU and I/O cards, and even
computer-on-modules (COMs). This exibility allows easy migration
from SBCs to COMs and vice-versa, or from processor to processor,
while preserving investments in mechanical designs.
CoreModule
®
PC/104 - ISM™ • 90 mm x 96 mm
ReadyBoard™
EPIC • 165 mm x 115 mm
LittleBoard™
EBX • 203 mm x 146 mm
What is SUMIT™?
SUMIT™ is one of many board-to-board expansion
interfaces that are permitted with ISM™. SUMIT™,
short for Stackable Unied Module Interconnect
Technology, offers PCI Express
®
, USB, SPI, I
2
C, and
LPC Bus expansion using, footprint-efcient, 52-pin,
high-bandwidth rugged Samtec Q2-series connectors.
This mix of high-speed and low-speed buses simplies
the task of attaching many types of I/O without
complex bridges and software.
What is SUMIT-ISM™?
An ISM-size SBC with SUMIT™ expansion is called a “SUMIT-ISM™
SBC”. An ISM-size I/O card is similarly called a “SUMIT-ISM™ I/O
module”. A more general naming scheme handles SBCs that accepts
smaller boards as I/O cards, or SBCs with multiple buses, in a
descriptive manner by mentioning the form factor rst, followed by a
list of expansion interfaces. For example, “ISM™ SBC with SUMIT™
and PC/104 expansion”, and “EPIC SBC with SUMIT™ and PC/104
expansion” are some of the possibilities. The notations “SUMIT-ISM™”
or “SUMIT™ on ISM™” are contracted forms for a special case, while
boards with multiple interfaces could be more confusing to label with
contracted names.
Who manages these standards?
A new, independent standards organization called the Small Form
Factor Special Interest Group, or SFF-SIG, creates, adopts, and
maintains a number of emerging standards for the low power, small
form factor market. As consumer technology is often inappropriate
for the embedded market, the standards feature re-usable modular
building blocks, developed by embedded vendors for embedded
OEMs. Many of these are optimized for ultra low power processors
and controllers, yet scale up to multi-core processor environments.
For more information about the specications, visit www.sff-sig.org.
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