COTS PCI104 Board

PCI/104-Express Bus

[PCI/104 Description] [PC/104 Pin-Out]
[PCI-104 Interface ICs] [PCI-104 Connectors]
[PCI-104 OnLine Standards] [PCI-104 Cards]

PCI/104-Express Bus Description

PCI/104-Express is one of the newer variations of the PC104 standard. PCI/104-Express combines a connector for a PCI interface and a connector for the PCI-Express [PCIe] interface. Similar to the introduction of the PCI/104 interface in many other board formats, PCI/104 now uses the PCI Express [PCIe] electrical interface. This is basically a follow on to the PCI-104 specification, which only used a PCI connector and now adding a connector for the PCI express interface. 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.

The elimination of the J1 and J2 connectors allows for the addition of the PCI-Express interface connector. The PCI-104 specification defines the mechanical foot print and card power requirements.
This is a stacked bus with no backplane or interconnecting cable. The cards plug into each other.

The card size for each of the PC/104 standards is shown below.

PC-104 Board Size

Card [dimensions] size / 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.

{PCI/104-Express Bus Index}

PCI/104-Express Bus Pin-Out

PCI-104 Pinouts
Pin out signal name table for the PCI-104 interface bus.

{PCI/104-Express Bus Index}

PCI/104-Express Bus Interface IC Vendors

The PCI-104-Express bus uses the same integrated circuits as PCI-Express Bus.
The PCI104 bus and the PC/104-Plus use normal CMOS devices for the PCI Bus interface.
It's the same interfaces in a different form factor.
The main listing of ICs are listed on the original interface pages, and not relisted here.
The electrical interfaces isn't changing, only the board and connectors [the physical interface].

Integrated Circuit manufacturers listed on this site:
Memory Chip Manufacturers
Processor Manufacturers
FPGA Vendors
Glue Logic Manufacturers

{PCI/104-Express Bus Index}

PCI/104-Express Online Standards and Specifications

PCI-104 Specification [Version 1.0, 2003]

PCI-104-Express Specification [Version 1.0, 2008]
PCI-104-Express Specification [Version 2.0, 2011]
I believe that PCIe/104 is a part of the above specification.

{PCI/104-Express Bus Index}

PCI/104-Express Bus Connector Manufacturers

The PCI side of the card uses a 4 x 30 (120-pin) 2mm pitch stack-through connector or non-stack-through connector.
However the PCI express side of the board uses a connector similar to the one used in the SATA.

The companies may produce one or both of the connector styles.

ept {PC104 Connectors-PC104 Plus Connector Manufacturer}

Tyco Electronics {PC/104 Connector Manufacturer}

Topic Navigation: Engineering Home > Interface Buses > Backplane Interface Standards > PCI/104-Express Board Standard.

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Modified 3/05/12
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