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The Submillimeter Array computers make use of fiber-optic reflective
memory from VME Microsystems International Corporation, part number
VMIVME-5576. These VME boards allow 256K of RAM to be shared between
the array's central computer and the antenna computers. Information
written to reflective memory on one end appears on the other end within
. They also provide the capability for a board to cause an
interrupt to be generated on the VME bus of another board. This feature
is used to provide notification between computers when reflective memory
contents are changed.
In the final configuration of the SMA, with 8 antennas plus the JCMT and
CSO, there will be 10 pairs of reflective memory cards. Each will
connect the central computer to one of the 10 antennas.
2008-06-18