VME Board Sizes; Mechanical Dimension for VME cards
VITA 48 "Ruggedized Enhanced Design
Implementation" (REDI) draft standard for 3U and 6Ux160mm
commercial off-the-shelf (COTS) modules. This standard intends
to create a unified mechanical standard for 3U and 6U COTS
modules using air-, conduction- or liquid-cooling methods. The
REDI mechanical enhancements are independent of electrical
standards such as VITA 46 (VPX) or VITA 41 (VXS). The first
initiative underway combines VITA 46 and VITA 48 to produce
a next-generation platform called VPX-REDI.
REDI has increased the maximum allowed pitch (or spacing)
between modules to 1" from the IEEE 1101 standard of 0.8".
A greater maximum PWB thickness is also allowed. Whereas
IEEE 1101 practice allows for a 0.063" maximum PWB thickness,
REDI accounts for up to a 0.120" thickness.
There is a slight increase of 0.050" on the primary side of the
PWB that is over IEEE 1101 practice. While this may seem very
small, it is sufficient to enable components, such as those associated
with memory or on-board power systems, to reside under
one of the previous "keep out" areas in IEEE 1386 or VITA 42
XMC mezzanine cards when these are on a 12mm high mezzanine
connector option allowed in REDI. ...... Highlighted is the 0.150" increase in secondary side dimension,
and the 0.120" increase in primary side dimension........
.... The air- and conduction-cooling sections of the standard push the
ceiling of thermal management to 200W per module.Use of the liquid-cooling methodologies of VITA 48 is intended
to allow upwards of 500W in a single module slot.....
VITA 48 REDI standard:
VITA 48.0 - Mechanical Specifications for Microcomputers Using
Ruggedized Enhanced Design Implementation (REDI)
VITA 48.1 - Mechanical Specifications for Microcomputers REDI Air
Cooling Applied to VITA 46
VITA 48.2 - Mechanical Specifications for Microcomputers REDI
Conduction Cooling Applied to VITA 46
VITA 48.3 - Mechanical Specifications for Microcomputers REDI
Liquid Cooling Applied to VITA 46
IEEE 1101.1 Base Document for Mechanics ~ Defines 3U/6U/9U (high) x
100/160/220/280/340/400mm (Long) cards
IEEE 1101.10 Mechanics for VME Boards and Subracks
IEEE 1101.11 Mechanics for Rear Transition Modules
Three card heights are allowed with VME; 3U, 6U, or 9U; a single slot
card is 6T wide. Length is either 160mm or 340mm (Norm)
Height is given in 'U' [1U = 43.60mm], Length is given in 'mm', Width is
given in 'T' or HP [1HP = 5.08mm [HP: Horizontal Pitch];
Card sizes listed below are one slot or 6T wide
A size CCA dimensions = 3U x 160mm. A 3U Printed Wiring Board
[PWB] is 100mm high.
B size CCA dimensions = 6U x 160mm. A 6U Printed Wiring Board
[PWB] is 233mm high.
C size CCA dimensions = 6U x 340mm, ...
{H x L x W {@ width=6T}
D size CCA dimensions = 9U x 340mm. A 9U
Printed Wiring Board [PWB] is 360mm high.
A, B, C, and D are VXI terms. VME normally only references 3U or 6U
[dimensions] by a length.
The board thickness for VME cards is 0.063 +/- 0.008 inchs [1.6mm +/-
0.2mm] Thicker or thinner CCAs may not fit in the card guides
correctly.
How ever an 0.90 board may work if you mill down the top and bottom
[2.5mm] of the card to 0.63 so it fits in the card guides.
A, B, C, and D are VXI terms. VME normally only references 3U or 6U by a
length, but the 9U was added a few years ago.
The VMEbus PWB Dimensions [size] or form factor is also called the
Euro-card form factor.
Back to the main VMEbus page for additional details including connector types, bus pin outs, and electronic equipment manufacturers and component manufacturers. OEM VME Card Vendors, and products listing is found on the VME Board manufacturers page. {This Web Site}
Abstract: Available VME board sizes. What are the VMEbus board formats. Show the different VME Card form factors
Compare the different VMEbus board dimensions. Comparison of VME card lengths and card heights. What is the depth of a VME board.
Engineering Key Words: PWB,CCA, Circuit Card, Printed Wiring Board, Form Factor, Dimensions, Mechanical, Mechanics, Height, High, Long, VME {Versa Module Europa} Extension for Instrumentation, VME, VMEbus, Versa Module Europa, IEEE 1014-1987, Euro-Card size, Embedded Computer bus, Usable Component Space, Front panel hole locations, How tall is a VPX card, How long is a VPX card.
|
|
|||||||
| Home | |||||||
|
|
|||||||
|
|
|
|
|
|
|
|
|
| Distributors | Components | Equipment | Software | Standards | Buses | Design | Reference |