VXS Cover

VME

Switched

Serial

“VXS” is a trademark of VITA

VXS Overview

• Adds switched serial interconnect(s) to the VME architecture

coincident with the VMEbus parallel bus.

• Employs standard open technology for the serial switched links.

• Accommodates multiple switched serial technologies, but not

necessarily at the same time.

• Utilizes MULTIGIG RT 2 connector in P0 position. Demonstrated

to support 10 Gb/s.

• Pulls additional DC power onto each VME card over existing

P1/P2 pins (VITA 1.7).

• Maintains backward compatibility.

VXS Family of Standards

ANSI/VITA Standard

Draft Standard

VXS 41.1

InfiniBand

Protocol Layer

VXS 41.2

Serial RapidIO

Protocol Layer

VXS 41.8

10GbE Protocol

Layer

VXS 41.3

GbE Protocol

Layer

VXS 41.4

PCI Express

Protocol Layer

VXS 41.5

Aurora

Protocol Layer

VXS 41.6

1x Gigabit

Ethernet

Control

Channel Layer

VXS 41.0VMEbus Switched Serial

Base Specification

VXS 41.10

Live Insertion

System

Requirements

Relative Bus Performance

Feature PCI bus PCI-X VME642eSST

VMEVXS

Topology Shared bus Shared bus Shared bus Shared busSwitched

serial

Theoretical maximum

bandwidth264 MB/s 1064 MB/s 80 MB/s 320+ MB/s

2.5 Gb/s per

1x link

Practical maximum

bandwidth~100 MB/s ~760 MB/s ~40 MB/s 320 MB/s 8 Gb/s

Simultaneous

transactions1 1 1 1 Many

Aggregate bandwidth ~100 MB/s ~760 MB/s ~40 MB/s 320 MB/s 36 GB/s

Bus performance is a reason to use VME!

Why VXS?

• The most demanding applications (e.g. SPE, radar, sonar, image processing, etc.) require:

– High performance, scalable processing power

– Very high data transfer capabilities

– Extremely low latency

• Currently these applications make use of:

– VMEbus for “control plane” communication

– A proprietary or quasi-standard bus for “data plane” communication

• Standard interfaces are now able to address these needs and provide:

– Less Contention

– Increased Scalability

– Less Routing Real Estate

– Higher Bandwidth

– Low Latency

Multiple Topologies

Dual Star Single Star Mesh

VXS components

Payload boardSwitch board

Example backplaneNote: not all backplanes would need a switch!

P0 connector200 insertions

Courtesy Tyco Electronics

www.multigigrt.com

Alignment and Protocol Keying

VMEbus

VXS Switch Card Connection Example

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P

2

P0

P

1An example

8 user-slot,

1 switch card

backplane

Fabric

Switch

Slot 1 link

Slot 2 link

Slot 3 link

Slot 4 link

Slot 5 link

Slot 6 link

Slot 7 link

Slot 8 link

VXS Switch Card (no VME)

Logical connections to switch card

Slot

8

P1

P0

P2

Slot

1

P1

P0

P2

Slot

2

P1

P0

P2

Slot

3

P1

P2

Slot

4

P1

P0

P2

Slot

5

P1

P0

P2

Slot

6

P0Slot

7

P0

VXS Backplane

VME – VXS Compatibility

2eSST

VMELegacy

VME

VXS +

2eSST VME

Fabric Only VXS

(no parallel bus)

Parallel Bus Compatible

Switched Serial Compatible

All of these cards can coexist in the same VXS chassis

Payload Board

Top Handle

Bottom Handle

Front Panel

4 HP

P1

P2

P0

K0

Photo courtesy of TEK Microsystems, Inc.

Switch Board

VXS: Connectors

VITA 41 payload board P0 connector

VITA 41 switch card P1-P5 connectors

VXS Suppliers

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Concurrent Technologies Plc

CSP Inc.

Curtiss-Wright Controls, Inc.

Elma Bustronic Corporation

Elma Electronic Inc.

EVOC Intelligent Technology

Hartmann Electronic

Mercury Computer Systems, Inc.

Meritec / Joy Signal Technology

Pentek, Inc. SIE Computing Solutions TEK Microsystems, Inc.

W-IE-NE-R, Plein & Baus GmbH

VXS Products

TEK Microsystems, Inc.

Atlas

TEK Microsystems, Inc.

ADC-DCA

Pentek, Inc.

4207

CSP Inc.

M16 Switch

VXS Products

Elma VXS 18 Slot

Hartmann VXS Backplane