CC-PC board design guide-lines

Computing ECS CC-PC E-mail Notes Meetings Subsystems Search



LHCb Connector

Glueboard Dimensions

CC-PC board connector


RS232 Pin Info
Reference Design            

This page collects various design guide-lines and recommendations for board-designers implementing a CC-PC. It will be constantly updated. Please mail about anything you find incorrect, incomplete or missing.


Each board hosting a CC-PC must provide an Ethernet connection. The CC-PCs will be connected to the ECS network via 100BaseT Ethernet (a.k.a as "copper-based" Fastethernet).
The Ethernet Media Access Controller is part of the CC-PC, it is an i82559 (datasheet pdf) from intel. The two differential RX and TX signals need to be connected to an RJ-45 connector on the front-panel. Ethernet requires a suitable magnetic filtering circuit as close as possible to the connector, which is the reason why this filtering must be provided by the carrier board.

We have verified two connector / magnetics combinations, which work with the i82559/CC-PC

1.) An RJ-45 connector with integrated magnetic filtering:
     PulseJack J0035D21B (datasheet pdf) from Pulse Engineering

2.) A discreet magnetic filtering device:
     Botthand 16ST8515 (datasheet pdf)  base pulse transformer from Botthand.
     Find here a drawing of an example circuit.

Pin-Out of the LHCb Connector

Most changes to the pin-out of the LHCb Specific connector  to the PLX PCI9030 (datasheet and Errata) interface chip between PCI and the local bus. This chip has a different set of control signals to the Local bus and hence this had to be reflected in the pins of the connector. We tried to re-use control signals as much as possible, so that existing designs wouldn't break.

Find the final pin-out of the  glue-card here (the old pin-out is still here for comparison). An explanation for the changes in the pin-out can be found under this web-page.
The mechanical dimensions of the gluecard can be found here.

The glue-card connector to the CC-PC includes all signals which need to be routed between CC-PC and glue-card. Its definition is here.

Other minor changes concern JTAG. On the new board the JTAG producing circuitry (emulating a ByteBlaster cable) will be supplied by a voltage which is taken from the carrier board and this will determine the signaling level of the output JTAG. Like this the implementer can choose the Level of JTAG between 3.3 and 5 Volts. This feature will most likely disappear in future versions of the glueboard, since the Chip envisaged to fan-out JTAG to different JTAG chains can ONLY run at 3.3 Volts.

Dimensions of the LHCb Glue-Card (2nd Prototype)

The dimensions and connector locations of  the LHCb Glue-Card v2.0 can be found here. The final prototype (currently under test) might have slightly different dimensions, but we will do our utmost that the connector locations are not changed. The mechanical dimensions and the connector locations can be found here. While there might be slight changes in the future on the board itself, the dimensions and connector locations should not change anymore.

CC-PC Board connector

The following connector is needed to hold a CC-PC on the board:
MOLEX 240 pin (h = 5mm)   Molex Reference Number 53475-2409 (data-sheet)
Alternatively you can use a 53467-2409 (6 mm) or 53481-2409 (7 mm)
The mating connector on the CC-PC is a Molex 240 pin 52760-2409

We have some of these connectors and can provide you with small quantities. If you need any or even better have a good source please write to


From the datasheet it is not completely obvious that the CC-PC needs only 5.0 V power supply. The 3.3 V at pin A91 and B91 of J2 are actually outputs (to be used with care, for a total of ~ 1 A). This is made clear in the integration manual V1.6 (section 4.2.5, page 36). The 3.3 V for the core voltage of the CC-PC are generated internally, and will make the D31 LED go on (or at least should, we have seen CC-PCs where this is not the case, although they work!).

RS232 - serial port (COM0)

The CC-PC does not generate the correct levels for the serial port. An additional chip is needed, e.g. the MAX211 (datasheet), which is included on the LHCb Glue-Card. Important: If you do not intend to use the serial port, i.e. you do not have the MAX211 RS232 or equivalent, then you need 4.7k pull-ups respectively pull-downs on the four signals:

CTS1-, DCD1-, DSR1-, RX1 and RI1-

Failing to do so might  halt the CC-PC in the POST (POwerupSelfTest) sequence of the BIOS before the graphics card is initialised - your screen will stay black...

Information for specific pins: clarifications, FAQ etc

Under this heading information concerning specific pins is collected. This information is drawn from experience or from Digital Logic's support

  • B13 CORE 3/5 i Only factory: COREBIOS B14 CORE 3/5 i Only factory: VGABIOS
    Only needed to connect external BIOS: leave unconnected

Evaluation Board & reference design:

Schematics of the test-board for the final glue-card are available here


Please send comments and suggestions to

This page last edited by NN on June 26, 2003.