[PC/104 Description] [PC/104 Pin-Out] [PC/104
Timing]
[PC/104 Interface ICs] [PC104
Connectors]
[PC/104 OnLine Standards] [PC-104 Cards]
[PCI Page] [ISA Page]
[Home]
The embedded PC/104 bus uses the PC/XT, and PCAT card specification (IEEE P996),
but changes the form factor [board size]. The specification defines the
new mechanical foot print and card power requirements. |
PCI-104 is the newest
variation of the standard. PCI-104 removes the old PC XT / AT bus from
the specification leaving only the PCI bus. The PCI bus connector is a
4x30, 2mm stack-through connector. PCI-104 cards may still reside in a
stack with either PC/104 cards or PC/104-Plus cards. However when PCI-104
boards are combined in a stack with other board types they must reside on
the top of the stack [because they do not have the XT or AT connectors].
If PC/104-Plus cards are used they must reside underneath the PCI-104
cards. Component height above and below the board has changed. This PCI
bus operates at 33MHz, 66MHz PCI operations are not supported.
The card size for each of the PC/104 standards is shown below.
Card size [dimensions] / Board Form Factor
Boards may be stacked 6 high when using the PC-AT [PC/104] bus, but only four of the boards may use the PCI bus, plus the Host board. In many cases the PC/104 stack is encased in a metal chassis. An embedded mother board format called EPIC contains a PC/104 stack area, allowing PC/104 boards to interface with the motherboard.
PC/104 Pin Out ISA [PC-AT/PC-XT] pinouts. [ISA bus Interface]
PC/104-Plus Pin Out PCI pinout [PCI bus Interface]
The PC104 Bus timing for is derived from the PC/PCAT
specification, IEEE P996.
The PC/104-Plus [which adds the PCI
bus], and PCI-104 timing is derived from the PCI specification
PC/104 and ISA use standard TTL logic levels for the AT and XT PC bus interfaces. An input Low is 0 to 0.4v, High is 2.4v to Vcc. An output Low is 0 to 0.8v, High is 2.0v to Vcc. The bus drive was reduced from 24mA used on the ISA bus to 4mA. The PC/104-Plus addition to PC104, and PCI-104 buses use normal CMOS devices for the PCI bus interface. Operational voltages for the PCI interface will either be 5 volts or 3.3 volts as determined by the PCI Host. The PC/104-Plus standard defines a maximum of 39 watts per board [total from all supply voltages].
Integrated Circuit manufacturers listed on this site:
PCI Chip
Manufacturers
Memory Chip Manufacturers
Micro-Processor Manufacturers
PC Chip Set Manufacturers
Glue Logic IC Manufacturers
--------
PC/104 and PC/104-Plus Specifications {VersaLogic Corp.}
PC/104 and PC/104-Plus Specifications {PC104.org}
PC/104 Spec ver 2.5, and PC/104-Plus ver 1.0 {PC/104 Consortium}
PC/104 Specification Version 1.0; March 1992
PC/104 Specification Version 2.1 / 2.2; July 1994 / September 1994
PC/104 Specification Version 2.3; June 1996
PC/104 Specification Version 2.4; August 2001
PC/104 Specification Version 2.5; November 2003
PC/104-Plus Specification Version 1.0; February 1997
PC/104-Plus Specification Version 2.0; November 2003
The Pin-and-Socket connectors used with the PC104 bus have .100" spacing,
and may be 'stack-through' (pins extend out the other side of the PWB),
or 'non-stack-through (normal PWB mounting).
The 8 bit XT card uses a 62 pin connector, The 16 bit AT version adds
another 40 connector.
The PCI side of the card for PC/104-Plus or PCI-104 uses a 4x30 (120-pin)
2mm pitch stack-through connector.
ept {PC104 Connectors-PC104 Plus Connector Manufacturer}
Teka Interconnection Systems {Solder Flux Bearing Lead Connectors}
Tyco Electronics {PC/104 Connector Manufacturer}
Home | |||||||
Distributors | Components | Equipment | Software | Standards | Buses | Design | Reference |