Skip to content

  • Projects
  • Groups
  • Snippets
  • Help
    • Loading...
  • Sign in
DIOT CompactPCI Serial crate hardware
DIOT CompactPCI Serial crate hardware
  • Project
    • Project
    • Details
    • Activity
    • Cycle Analytics
  • Repository
    • Repository
    • Files
    • Commits
    • Branches
    • Tags
    • Contributors
    • Graph
    • Compare
    • Charts
  • Issues 39
    • Issues 39
    • List
    • Board
    • Labels
    • Milestones
  • Merge Requests 0
    • Merge Requests 0
  • CI / CD
    • CI / CD
    • Pipelines
    • Jobs
    • Schedules
    • Charts
  • Wiki
    • Wiki
  • Snippets
    • Snippets
  • image/svg+xml
    Discourse
    • Discourse
  • Members
    • Members
  • Collapse sidebar
  • Activity
  • Graph
  • Charts
  • Create a new issue
  • Jobs
  • Commits
  • Issue Boards
  • Projects
  • DIOT CompactPCI Serial crate hardwareDIOT CompactPCI Serial crate hardware
  • Wiki
  • Home

Home

Last edited by Erik van der Bij Oct 11, 2021
Page history

DI/OT 3U crate project

Project description

The 3U crate is a main component of the Distributed I/O Tier hardware kit. The enclosure is assembled using 3U sub-rack components compatible with the IEC 60297-3 and IEEE 1101.10-1996 mechanical standards. These are low-cost aluminum elements available in the products portfolio of all major crate vendors. The crate provides:

  • in-house designed 9 slot backplane compatible with CompactPCI Serial standard
  • support to host Rear Transition Modules (RTMs) - the RTMs are usually fully passive boards that provide an interface with external equipment through a direct RTM connector to the corresponding Peripheral Board
  • two power supply slots (two power backplanes) to host dual modular redundancy power supplies in load-sharing configuration
  • optional 1U fan tray that can be mounted either below or above the main 3U crate

DI/OT crate 19" rack variant:

nVent_DIOT

DI/OT crate tunnel variant:

DIOT_crate_full_3d

DI/OT main backplane

The DI/OT main backplane is a KiCad design compatible with the CompactPCI Serial standard. It provides 9 slots (1 System Slot and 8 Peripheral Slots) and the support for RTMs.

DI/OT main backplane(front view):

backplane_front

DI/OT main backplane topology:

backplane_topology_scaled

The backplane provides:

  • a star topology of 144 LVDS lanes in total (18 LVDS lanes per Peripheral Slot) used as differential or single-ended I/Os to implement communication between the System and Peripheral Boards. Out of those, 1 LVDS lane per Peripheral Slot is reserved for the distribution of low-jitter clock and 2 LVDS lanes are designated for high-speed communication
  • the Reset line driven by the System Slot to reset all the Peripheral Boards
  • a set of 5 multidrop lines (multidrop IRQs) can be used as interrupt lines of 5 priorities, or for any other one-to-many signaling.
  • a star of single-ended presence detection signals and a service I2C bus (shared among all the slots)
  • distribution of two auxiliary voltages to all Peripheral Slots.

Release

Date Release
17.08.2021 v1.2
04.05.2020 v1.1

Contacts

  • Greg Daniluk - CERN

Status

Date Event
May 2019 CPCIserial backplane and Power backplane PCB design kick-off; backplanes development notes
Nov 2019 Mechanical crate design kick-off; crate development notes
Jan 2020 Discussion with nVent/Schroff; Schroff meeting notes
Marc 2020 Crate mechanics release v1.0
Apr 2020 Crate mechanics review of v1.0 with 15 engineers
May 2020 Crate mechanics release v1.1
3 Dec 2020 First 2 prototypes delivered by nVent
15 Jan 2021 Crate prototype delivered by Creotech
17 Aug 2021 Ordering 25 v1.2 crates for lab and IT String tests at CERN
10 Sep 2021 Design of optional DI/OT fan tray finalised
11 Oct 2021 Ordered ten DI/OT fan tray prototypes
Clone repository
  • Diot backplanes dev notes
  • Fan tray
  • Files
  • Release v1.1
  • Release v1.2
  • Schroff meeting notes
  • Home
  • Release v1.0
  • DI
    • Diot crate dev notes
More Pages

New Wiki Page

Tip: You can specify the full path for the new file. We will automatically create any missing directories.