[Futurebus Description]
[Futurebus Interface ICs] [Futurebus Standards Links]
[Futurebus Connectors] [Futurebus Pin-Out]

Futurebus Description

Futurebus and then Futurebus+ is a back-plane bus specification which defines both the Physical and Electrical layers.
The Futurebus bus width started at 32 bits wide, but now with Futherbus+ the width may be up to 256 bits.
Bus widths of 32, 64,128 and 256 are possible at a clock rate of 100MHz.
The data may transfer with either asynchronous or source-synchronized protocol. When operating with 256 bit transfers, the data rate may be as high as 3200MBps.
The FutureBus card size is defined as 300mm x 300mm, and uses 2mm style connectors.
Bus (card) addressing is fixed by the card slot, with each card receiving a unique fixed 5bit address number
Data transfer uses a broad-cast approach for the addressing. The Master out-puts the address in combination with an AS line,
and then waits until (each) all cards have asserted the Ack line. Once all cards have Ack-ed, data is output with the data valid strobe DS.
The recipient then asserts the data ack line (DK)

I do not believe that Futurebus was ever adopted by any one, and Futurebus+ [Futurebus-Plus] never saw wide spread usage.
The Futurebus connectors are still used and may be procured, but I can't find many Integrated Circuit vendors producing parts.

Futurebus Bus Pin Out

{FutureBus Index}

Futurebus On-Line Standards Information

896.1: Futurebus+ Logical Layer Specifications
896.2: Futurebus+ Physical Layer Specifications
P896.3: Futurebus+ System Configuration Guide
1014.1: VME/Futurebus+ Bridge

Institute of Electrical and Electronics Engineers, Inc., IEEE [www.ieee.org]

{Back to Futurebus Index}

Future Bus Interface IC Vendors

The Futurebus and Future bus+ specification use Backplane Transceiver Logic (BTL) Family of devices - ABT and FB series of parts.
A number of companies offer these series of parts; however only TI offers Futurebus specific chips.

Glue Logic Voltage Threshold Levels

Click for a larger Image of a Logic Voltage Threshold Chart

BTL Device Manufactures
IC Manufacturers {All other types}

{Futurebus Interface Index}

Futurebus Connector Manufacturers

IEC 1076-4-104: 2mm connectors, Hard Metric Packaging Specification.
FutureBus connectors, which use 2mm style have a mating distance of 10mm. cPCI also use 2mm connectors with a mating distance of 12.50mm, matching the 96 pin DIN 41612 connectors used with other EuroCard packaging [IEC 273 or IEEE 1101, 1101.10], like VMEbus.
However; because the mating distance is different, FutureBus connectors are not compatible with cPCI or VME connectors.

CTS Drawing, 2mm Shielded Futurebus Connector

CTS Corporation
{2mm Pitch Futurebus Connector, Unshielded, Shielded}

DINTEK {Future Bus 4/5 rows. Press fit/Solder. Male/Female}

{Future Bus 2mm Conn 4Row Power Header, Signal Header, Receptacle, 5 Row}

Harwin Plc
{2.00mm Pitch Futurebus Connectors 8/9 Row Housing Unshielded/Shielded 8x12, 9x12}

ITT Industries
{2mm Futurebus Connectors, 4 and 5 row / Hybrid and Shroud Coax Contacts}

Molex Inc.
{Futurebus+ Connectors}

{Futurebus Connectors; 4/5 row male/female, male power connector, 4-pair}

tyco Electronics
{2mm Centerline Futurebus+ Connector Manufacturer}

CTS Drawing, 2mm Shielded Futurebus Connector
Top Lengths: 5.00, 5.75, 6.50, 7.25, 8.00mm
Tail Lengths: 4.30, 12.10, 13.60, 15.10, 15.60, 17.00mm

Both Futurebus and the upgrade Futurebus+ are out-dated.
No additional work has been done to upgrade the specification over the years.
However vendors still produce products which meet the Physical and Electrical layers of IEEE-896.
Of course as with the case of the 2mm connector standard, many or uses can be made with that connector style.

{Back to Futurebus Index}

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Modified 6/13/15
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