Standard 32 Bus

[STD 32 Bus Description] [STD 32 Bus Standards Info] [STD 32 Bus Interface IC's]
[STD32 Board Manufacturers]

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STD 32 Bus Description

STD32 which defines a bus with a 32 bit data bus running at 32MBps, was an up-grade of STD Bus; a Scalable back plane bus spec for 8/16 bits. The STD bus and STD32 bus may not be interchanged, and are incompatible. STD bus was developed in 1978,and STD32 in 1989. STD 32 is also a superset of the STD-80 architecture. The STD 32 bus pins reside on 0.0625" centers, which are between the pin spacing of the STD-80 bus. STD 32 cards retain the same form factor and may be inserted into STD-80 connectors. The new 'E' pins for STD 32 reside between the STD-80 'P' pins. This bus uses card edge fingers, etched onto the PWB as traces. STD 32 bus defines the electrical and mechanical specifications of the interface, bus timing is included.

The STD 32 bus defines an 8bit, 16 bit or 32bit data bus, with a 16bit address bus. An additional 8 bits of address lines [for a total of 24bits] are multiplexed onto the lower order data lines [D0 - D7]. Termination resistors are required, the value of the termination resistor varies with the pin function. Diode termination may also be used if required at both ends of the backplane. The specifications defines 136 signals; 117 data and control lines, with the rest power and ground lines. All lines are TTL compatible.

The card size is defined as 4.5" x 6.5". Board thickness is 0.062". Board-to-Board spacing on the backplane is 0.0625", or 0.50" if you want to be compatible with STD-80.

It's hard to go wrong with this board specification, every thing is covered. The specification is out dated, and is not being used for new designs. The STD32 interface is obsolete. Use the Buses icon at the bottom of the page to locate current bus interfaces in the same form factor. The STD Bus preceded the STD 32 Bus.

STD32 Form Factor

STD 32 Bus Standards Information

STD 32 Bus Specification and Designers Guide; Version 2.1, July 3, 1996
STD32 Specification *.pdf {Spec download, info, and links, on the Web}

STD 32 Bus Interface IC Vendors

STD 32 bus uses normal [+5 volt] standard TTL switching levels V_IH = 2v, V_OH = 2.4v.

TTL glue logic IC Manufacturers .... IC Manufacturers {All other types}

STD32 Board Manufacturers

STD32 card manufacturers links are provided below.

Micro/Sys
{Computer; 486DX/66-133, 386SX/25, 8/16-bit STD memory, Analog I/O, Timer, Digital I/O, Extender board, Prototyping board}

Robotrol Corp.
{STD32, STD80}

VersaLogic Corp.

Win Systems
{Single Board Computers, Memory Expansion Cards, Disk Controllers/Mass Storage, Video/Graphics Controllers, Networking/Communications Controllers, Serial and Parallel I/O, Analog I/O, Special Function Cards, Accessories, Card Cages}

{STD32 Bus top}

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