[ PCI/104 Description ] [ PC/104 Pin-Out ] [ PCI-104
Timing ]
[ PCI-104 Interface ICs ] [ PCI-104 Connectors ]
[ PCI-104 OnLine Standards ] [ PCI-104 Cards ]
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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
type boards 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. PCI-104 boards may only be stacked 4
cards high. This PCI bus operates at 33MHz, 66MHz PCI operations are not
supported. |
In other words a PC104 card is just like the [old] Personal Computer PC-XT interface card, or PC-AT interface card, and the PC104-Plus board is just like an older mother board with ISA slots and PCI slots. This standard is widely used for embedded computing application even though the PC ISA bus has been obsolete for years now. 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.
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.
PCI/104 Express is the newest variant of the PC/104 series of standards.
Similar to the introduction of the PCI/104 interface in many other board formats, PCI/104 now uses the PCI Express [PCIe] electrical interface.
PCI-104 Pinouts [signal assignments]
Pin out signal name table for the PCI-104 interface bus.
Note this I/O no longer carries the XT/AT interfaces, and only handles the PCI bus signals.
Only the PCI bus remains in this version of the specification.
The PC/104-Plus [which adds the PCI bus], and PCI-104
timing is derived from the PCI specification.
So all timing and signally is based on the PCI specification.
The PCI-104 bus and the PC/104-Plus addition to PC104 use normal CMOS devices for the PCI Bus interface.
Basically the same integrated circuits used with a normal CompactPCI interface.
Integrated Circuit manufacturers by function:
Memory Chip Manufacturers
Processor Manufacturers
Chip Set Manufacturers
Glue Logic Manufacturers
PCI-104 Specification [Version 1.0, 2003]
PC/104 Specifications {VersaLogic Corp.}
PC/104 and PC/104-Plus Specifications {PC104.org}
PC/104 Spec ver 2.5, PC-104-Plus Ver2.0, PCI-104 V1.0 {PC/104 Consortium}
There are yet two newer and faster PC/104 variations, both using the form factor;
PCI/104 Express [which uses the PCIe specification]
StackableUSB [which uses the USB specification]
The PCI side of the card for PC/104-Plus boards or PCI-104 boards use a 4
x 30 (120-pin) 2mm pitch stack-through connectors or non-stack-through
connectors.
While the older PC104 bus has .100" spacing, and may be
'stack-through' (pins extend out the other side of the PWB), or
'non-stack-through (normal PWB mounting). The PC/104 8 bit XT card uses a
62 pin connector, and the 16 bit AT version adds another 40 connector.
PC XT/AT connectors are not part of the PCI104 specification.
PCI/104 Connector Vendors;
ept {PC104 Connectors-PC104 Plus Connector Manufacturer}
Teka Interconnection Systems {Solder Flux Bearing Lead Connectors}
Tyco Electronics {PC/104 Connector Manufacturer}
Topic Navigation: Engineering Home > Interface Buses > Backplane Interface Standards > PCI/104 Board Standard.
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