Force Computers SYS68K/CPU-40, User Manual

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SECTION 4 APPENDIX TO THE HARDWARE USER'S MANUAL
H-7
REQUESTOR
A functional module that resides on the same board as a MASTER or INTERRUPT
HANDLER and requests use of the DTB whenever its MASTER or INTERRUPT HANDLER
needs it.
SERIAL CLOCK DRIVER
A functional module that provides a periodic timing signal that synchronizes operation of
the VMSbus. (Although the 1014 specification defines a SERIAL CLOCK DRIVER for use
with the VMSbus, and although it reserves two backplane signal lines for use by that bus,
the VMSbus protocol is completely independent of the 1014.)
SLAVE
A functional module that detects DTB cycles initiated by a MASTER and, when those
cycles specify their participation, transfers data between itself and the MASTER.
SLOT
A position where a board can be inserted into a 1014 backplane. If the 1014 system has
both a J1 and a J2 backplane (or a combination J1/J2 backplane) each slot provides a pair
of 96-pin connectors. If the system has only a J1 backplane, then each slot provides a
single 96-pin connector.
SUBRACK
A rigid framework that provides mechanical support for boards inserted into the
backplane, ensuring that the connectors mate properly and that adjacent boards do not
contact each other. It also guides the cooling airflow through the system, and ensures
that inserted boards do not disengage themselves from the backplane due to vibration or
shock.
SYSTEM CLOCK DRIVER
A functional module that provides a 16 MHz timing signal on the UTILITY BUS.