PC/104-Plus Specification Version 1.2 — Page 1
PC/104-Plus SPECIFICATION
Version 1.2 August 2001
1. INTRODUCTION
While the PC/AT architecture is becoming increasingly popular in embedded applications, there
is an increasing need for a higher performance Bus throughput. This is especially true when it
comes to graphics devices as well as other high speed I/O devices such as networks.
This document supplies the mechanical and electrical specifications for the “PC/104-Plus”and
incorporates all of the PC/104 features, with the added advantage of the high speed PCI bus. The
physical size, mounting configuration and electrical interconnect portion of the PC/104
specification shall remain unchanged.
1.1 Summary of Key Differences From PC/104 Specification:
! A third connector opposite the PC/104 connectors supports the PCI bus.
! Changes to the component height requirements increase the flexibility of the module.
! Control logic added to handle the requirements for the high speed bus.
1.2 Summary of Key Differences (120-pin PCI and PCI Local Bus Specification)
! The PCI bus connector is a 4x30 (120-pin) 2mm pitch stackthrough connector as opposed to
the 124-pin edge connector on standard 32-bit PCI Local Bus.
! The 120-pin PCI does not support 64-bit Extensions, JTAG, PRSNT, or CLKRUN signals.
1.3 References
This document covers the addition of the PCI functions. The following documents should be
used as reference for a detailed understanding of the overall system requirements:
! PC/104 Specification -- Version 2.4
! PCI Local Bus Specification -- Revision 2.1
Contact the PCI Special Interest Group office for the latest revision of the PCI specification:
PCI Special Interest Group
5440 SW Westgate Drive, Suite 217
Portland, OR 97221
800.433.5177 (U.S.) 503.291.2569 (International)
If errors are found in this document, please send a written copy of the suggested corrections to:
PC/104 Embedded Consortium
1060 North Fourth St.
San Jose, CA 95112
Tel 650.903.8304 Fax 408.999.0344
E-mail info@pc104.org
Website http://www.pc104.org