The DomHub Service Board (DSB)

Purpose

The DOR Service Board, DSB,  distributes master clock signals to DOM Hub Receiver cards in a DOM Hub chassis.  The requirements for the master clock distribution system  are covered in the document authored by Dave Nygren. 

The DSB design attempts to address the needs of DOM testing during production, the needs of software and firmware development before deployment to Antarctica, and the requirements of  first year deployment at the south pole, where four DOM Hubs for IceCube, and at least one DOM Hub for IceTop must be  synchronized to a GPS clock. 

The list of features/capabilities/limitations is a little too long for this web page. Most of the capabilities are captured in the requirements document, on Docushare in Wisconsin.  

Installation

See the installation figure

Evolution of Rev A

Design Files for Rev A went through several iterations.
 20040109_DSB_RevA.pdf

20040112 design file in OrCAD
20040112_DSB_RevA.pdf
20020112 Netlist (PADs Netlist)
20020112  BOM Bill of materials

20040113 design file in OrCAD Schematics  in pdf format:
20040113_DSB_RevA.pdf 20030113
20040113 Netlist (PADs Netlist)
20020113 Bill of Materials

Kit of  data sheets in zip file.
DSB Rev A Design files

DSB Testing after production.  Tests performed by LBNL technical staff, including Brad Bingham and others.
The  page with Supporting documentation amplifies and enhances the description of testing.

First cut of the Rev B DSB

DSB Rev B Change List.  The revised board layout will use the existing Wisconsin layout as a starting point.
20040709 DSB Rev B Schematic (PDF)
20040709 DSB Rev B Netlist for PADs
20040709 DSB Bill of Materials (XLS)
DSB Rev A post production mods

Rev B DSB, post Design Review

On July 19, a short design review was held.  In Berkeley, the attendees were Dave Nygren, Bob Minor, Brad Bingham, Thorsten Stezelberger, and Gerald Przybylski. Phoning in from Wisconsin were Albrecht Karle, and Kael Hanson.
The design review had two major areas of focus; the capturing in the schematic and layout of requirements in the recently released draft of the design document, and  the correction of  deficiencies  in  the design, layout and fabrication of  the Rev A DSB.  Notes were collected during the review by Brad Bingham.
In the first half of the meeting, the powerpoint presentation (available at both locations)  was discussed.  

Next, the design document was discussed. 

During the discussion,  note was made that loading options need to be called out in the bill of materials.  This precipitated another pass through the schematics. The results are below:

DSB Rev B Change List (nothing new here).  The revised board layout will use the existing Wisconsin layout as a starting point.
20040803 DSB Rev B Schematic (PDF)  Some descriptive changes. No connectivity changes. Enhanced part properties
20040803 DSB Rev B Netlist for PADs No connectivity changes.  Should look identical to the previous version.
20040803 DSB Bill of Materials (XLS) Includes a column identifying which (optional) parts should not be loaded.
20040803_DSB_Rev1.0_Design_Review (ppt) (use with the current version of the schematic for part references) Review 9:15am 7/19/04