Up to six PMC cards can be used with a single VME CPU board via adapters.
For example one CPU card can utilize up to 384 analog input channels by using PMC expansion adapters.
See "High Speed Expansion on VME with PMC", below.
Serial I/O card on True VME Form Factor
Four channel serial I/O with 32K byte FIFOs on each channel... [Read More]
Data Acquistion I/O Boards
General Standards Corporation is a leading supplier of data acquisition I/O boards, provides a complete family of data acquisition cards for sonar, industrial, and embedded applications on several form factors/busses, and for many operating systems.
Functions available include analog I/O, serial I/O, and high speed parallel I/O.
Ask About Other Form Factors
Ask About Other Drivers
FREEWindows, Linux, and Labview Drivers. FREELoaner Boards.
Analog I/O Boards
Analog I/O Board Features include:
Up to 64 input channels per board;
Programmable Sampling rates to 50M SPS;
Sigma-Delta and Delta-Sigma Analog I/O;
Resolutions from 12 bits to 24 bits.
Numerous CPU boards on VME provide PMC slots for I/O expansion.
One CPU board can utilize up to six PMC cards via the PMCspan product.
This allows one CPU board to have high speed access to: 1) Up to 384
analog input channels; or 2) Up to 96 analog output channels; or 3) Up to 24
high speed bidirectional serial I/O channels; or 4) Up to six high speed 32-bit
bi-directional parallel busses; or 5) Any combination of the above.
Standalone PMC-to-VME adapters can provided for additional I/O expansion.
------- PMCspan ---------
PMCspan allows for Up to Six PMC Cards to attatch to the I/O computer board.
PMCspan works with Emerson Network Power's VME based CPU modules. When
coupled with an MCG processor module, the PMCspan provides up to six PMCs,
more expansion capability than any other VMEbus processor module. Each
PMCspan supports either two single-wide or one double-wide PCI Mezzanine
Card (PMC). By stacking PMCspans, a total of four additional single-wide
PMCs can be added to MCG's compute engines-either today or as future
application growth demands.
The PMCspan is a standard 6U single-slot VMEbus module that links to its
host board via a PCI expansion connector. It supports both front panel and
P2 I/O access for customer supplied PMCs.
For more Info: http://www.emersonnetworkpowerembeddedcomputing.com/pmcspan_pmc_expansion_bo
Background on VMEbus
---- VME32 ---
VME32 is where everything started in August 1982. The original
specification was sponsored by VITA and eventually standardized as IEEE
1014. It established a framework for 8-, 16- and 32-bit parallel-bus
computer architectures that can implement single and multiprocessor systems.
This bus includes the initial four basic subbuses: (1) data transfer bus,
(2) priority interrupt bus, (3) arbitration bus, and (4) utility bus. Other
architectures with other subbuses are possible within this VME framework. ---- VME64 ---
In 1994, VME64 was formally approved by ANSI as ANSI/VITA 1-1994,
incorporating all the features of VME32 and adding support for 64-bit
Parallel Data: 8-, 16-, 32- and 64-bit
Bandwidth: up to 80MB/secThe data transfer bus will support 8-, 16-, 32-,
and 64-bit data transfers in multiplexed and non multiplexed form. The
transfer protocols are asynchronous with varying degrees of handshaking
dependent on the speeds required. The priority interrupt subsystem provides
real-time interrupt services to the system. The allocation of bus mastership
is performed by the arbitration subsystem which allows the implementation of
several prioritization algorithms. The utility bus provides the system with
power plus power-up and power-down synchronization. The mechanical
specifications of boards, backplanes, subracks, and enclosures are based on
IEC 297 and IEEE 1101.1 specifications, also known as the Eurocard form
factor. Additional standards exist that can be used as sub-busses to this
architecture for data transfers transactions, peripheral interfaces and
intra-crate communications among compatible modules.
For more Info on VME see VITA: http://www.vita.com/vme32.html
For detailed History and Description, see Wikipedia: http://en.wikipedia.org/wiki/VMEbus
========= VME =========
Miscellelanous terms used with VME:(vme digital) vme digital, vme digital
board, vme digital card, vme digital i/o, vme digital input, vme digital io,
vme lvds i/o, and vme pecl i/o.
---- vme data acquisition -------
VME Data Acquisition
-- vme serial ---
Includes: vme asynchronous, vme rs-232, vme rs-422, vme rs-485, vme serial,
vme serial board, vme serial card, and vme synchronous.
----- vme analog
Includes: vme analog, vme analog board, vme analog card, vme analog i/o, vme
analog input, and vme analog io.
---- vme opto-coupler
Includes: vme optically isolated, vme opto, and vme optoisolated.
----- vme drivers
Includes: vme windows 2000, and vme windows nt.