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
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.
Configurable for LSC or LDC
Configurable 3.3 Volt or 5 Volt supply to the link card
12 programmable buffered TTL I/O lines on LEMO connectors
Selectable number of inputs and outputs (0/12, 4/8, 8/4 or 12/0 I/O)
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
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.
23/6/1998: PCB design finished, PCB production in July 1998
27/7/1998: Five PCB boards, front-panels and P2 to P2 boards received
11/1/1999: boards not yet tested. Postponed until MFCC Altera design will
17/9/1999: board tested by Stefano Veneziano on MFCC/RIO2. No changes needed.
24/9/1999: new project started to make a VME64-X transition module.
7/4/2000: have changed series resistors to 68 Ohm to improve signal quality
The S2P2 is a completely passive card, so no software is needed. The following
is the status of applications using the S2P2:
23/6/1998: Altera software for the front-end Altera in the MFCC will have
to be written. Only a simple slave will be made (S-LINK data will be read
by the processor on a single cycle basis) as no bus master or DMA functions
are available from CES
17/9/1999: Stefano Veneziano has made ATLAS "ROB-in" functionality in the
Altera on the MFCC.
7/4/2000: "ROB-in" almost working
CERN - High Speed Interconnect
Erik van der Bij - 10 October