S-LINK to P2 adapter

(Circuit no. 680-1110-750)
Picture of the board with an FCS-LINK mounted
Picture of the empty board
Detail of the S-LINK connector and terminations
Picture of the P2 to P2 connector board


The S-LINK to P2 (S2P2) adapter is a VME board that can carry an S-LINK Link Source Card or Link Destination Card. The S2P2 is a passive board, which connects all S-LINK signals to rows A and C of the VME P2 connector. With a short cable or backplane plug connected to the VME backplane, the S-LINK signals can be fed into the slot next to the S2P2, where they can be brought up to the JN14 PMC connector. The S2P2 is powered via the P2 connector.

PMC cards like the MFCC from CES and the PMC version of the ATLAS Royal Holloway ROB-in can use the S2P2 to provide robust connectivity to S-LINK. The RIO II and RTPC from CES connects P2 to JN14 according the PMC standard.

The adapter features:

Note that although some processor boards have two PMC slots, only the bottom one may be used to connect a card that connects to S-LINK as the top PMC slot does not receive all P2 signals.

Although great care has been taken to keep the signal integrity, until the board has been tested in various configurations, it is not sure if the signal quality will be good enough for use with all link card, VME motherboard and PMC card combinations. The difficulties lie in the fact that the S-LINK clock signals may be up to 40 MHz, while the signals will have to go through four different connectors and run over four different PCBs. It is likely that this will give signal reflections which may affect reliability.

We have designed our own P2 to P2 board to be used in combination with the S2P2 that will connect at the back of a standard VME backplane. It just connects all signals of row A and C together.

The S2P2 has been used as a prototype for the VME64 Extensions transition module which gives connectivity to S-LINK cards.




The S2P2 is a completely passive card, so no software is needed. The following is the status of applications using the S2P2:



CERN - High Speed Interconnect - S-LINK
Erik van der Bij - 10 October 2000