transition card_29_06_2004

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					             Slink Transition Card




01/01/2012            James Leaver
                   Slink Transition Card

                                        • Simple 6U board:
                                               – Provides interface between
                       VME                       FED and Slink Transmitter
                     Backplane
                                               – Provides access to FED
                                                 Throttle signals



             FED                 Slink                            Slink Data &
                                 Transmitter                      Control Signals

                                                    6U
                                                                  FED Throttle
                            Ethernet
                                                                  Signals
                            Connector

                           Slink Transition
                                 Card


01/01/2012                         James Leaver
                    Features

• Board takes +5V from VME, generates +3.3V
  and +2.5V
• Slink data and control lines from FED are
  buffered to provide cleanest possible signals
• Differential Slink clock from FED converted to
  single-ended
• FED throttle signals converted to LVDS and
  output via Ethernet connector
• Status LEDs for voltage levels and the 2 spare
  BE FPGA signals (for debugging)
01/01/2012             James Leaver
              Layout

                              S-Link
  VME 64x                     Transmitter
  Connector                   Card
                              Mounting




                              LVDS
  Buffers                     Driver &
                              Ethernet
                              Connector
  Clock
  Driver
                              Status
 Power                        LEDs
 Supply



01/01/2012     James Leaver
                       Production Costs

 Have received PCB manufacture quotations from DDi and
 Express Circuits:

             • DDi:
               – 3 Boards     = £943.50       (10 days)
               – 450 Boards   = £13,464.50 (20 days)

             • Express Circuits:
               – 3 Boards     = £787.81       (10 days)
               – 450 Boards   = £9,694        (20 days)

                                                          (Ex. VAT)
01/01/2012                     James Leaver
                    Production Costs
• Express Circuits significantly cheaper (20 - 40%)

          BUT: Have yet to obtain assembly quotations

• Currently unsure whether DDi or Express Circuits +
  Cemgraft will provide better manufacture &
  assembly package

• First three boards will be ordered from Express, and
  assembled in-house
   – Component cost for 3 boards: ~£250


  01/01/2012                James Leaver
              Transition Card Testing

• Simple board  simple test requirements
      – Output test patterns from FED via Slink
        through Transition Card
      – Receive and verify test patterns
      – Errors on Transition Card should appear as
        incorrectly set bits in data transmission –
        easily traceable to specific contacts on board

• If prototype functions correctly, then
  further errors should be identified by
  manufacturer connectivity test
01/01/2012                James Leaver
                                     Timeline
A rough indication of the expected Transition Card progress
over the coming weeks:
                                Schematic complete, virtually all components obtained,
                            0
                                layout progressing well

                           5
                                Layout complete, order requested

                           10
             Time (Days)




                           15
                                3 Slink Transition Card PCBs received

                           20

                                All Transition Cards populated
                           25
                                All Transition Cards tested

                           30
01/01/2012                                James Leaver

				
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