Specifications

PCIe/104 and PCI/104-Express Specification Revision 3.0 February 17, 2015 Page 7
1.9.7 RTC Battery
Any board in a system can provide a 3.0 to 3.6 volt battery on pin 154 of the Type 2 connector. This battery shall be
current limited with a 1K resistor, reverse current protected with a schottky diode, and filtered with a 10uF capacitor.
Any board in the system may use the battery. Battery life will depend on the specific battery used and the load.
Figure 1-3 RTC Battery Example
1.9.8 PCI Expansion Bus
The PCI Expansion Bus is the same 32 bit, 33 MHz PCI bus found on the PC/104-Plus and PCI-104 Specifications with
the addition of +5V_SB, PSON#, and PME#.
1.10. References
The following documents should be used as reference for a detailed understanding of the overall system requirements.
For latest revisions of the above specifications contact the respective organizations.
PC/104 Specification
PC/104 Consortium
www.pc104.org
PC/104-Plus Specification
PC/104 Consortium
www.pc104.org
PCI-104 Specification
PC/104 Consortium
www.pc104.org
PCI Local Bus Specification Revision 2.2
PCI Special Interest Group
www.pcisig.com
PCI Express Base Specification Revision 1.1
PCI Special Interest Group
www.pcisig.com
ATX Specification Version 2.2
Intel Corporation
www.intel.com
System Management Bus (SMBus)
Specification Version 2.0
SBS Implementers Forum
www.sbs-forum.org
INTEL description of PEG and SDVO in the
915/945/965 chipsets
Intel
www.intel.com
USB Specification Revision 2.0
USB Specification Revision 3.0
USB Implementers Forum
www.usb.org
If errors are found in this document, please send a written copy of the suggested corrections to the publishers listed on the
title page.