The global event system Page: 2 of 15
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R1SP (RAM 1 Speed) Event clock 1 rate in Hz. This must be set to the clock rate of the
signal source on the Event CLK 1 input. It is only used to calculate the 'desired,
position' value of events that are placed into the sequence RAM. These events
are specified by the use of 'egevent' records.
If all 'egevent' record types that use the generator being configured will be using
'Clock Ticks' as their 'Delay Units' the value placed into R1SP is not used and
may be left as zero.
R2SP (Ram 2 Speed) Same ar R1SP for the second sequence RAM.
FIFO (FIFO Enable) Used to enable or disable the input-fifo on the generator board.
The fifo is used to allow more than one event generator to exist on the same
CLR1 (Clear RAM 1) Performing a 'put' operation on this field causes sequence
RAM1 to be cleared. The use of this field is undefined (and will cause great
problems) if there are any 'egevent' records configured in the database. This is
provided for testing purposes.
CLR2 (Clear RAM 2) Same as CLR1, but for sequence RAM2.
TRG1 (Manual Trigger RAM 1) If a 'put' operation is performed on this field, a one-
time trigger on sequence RAM1 will be initiated. The result would be that same
as if there were a hardware trigger applied to the 'Event TRG 1' input on the
TRG2 (Manual Trigger RAM 2) Same as TRG1, but for sequence RAM2.
ENAB (Master Enable) Master card enable. No events are generated unless the card is
enabled. In general, there should never be any reason to disable an event genera-
tor. This is provided for testing purposes.
TAXI (Taxi Violation Flag) This is set to a non-zero value when there has been a taxi
violation. It simply reflects that state of the violation signal on the taxi receiver
module. Taxi violations can not occur when FIFO is set to 'Off.'
VME (Manual Event Generation via VME Access) Used to send out a one-shot event
code. A put to this field will cause the event to be sent. It appears to be zero if it
is ever read. This can be 'OUT-LINKed' to by an other record in order to gener-
ate an arbitrary event when it is processed.
ETEn (Event Trigger Enable) These are the enables for the trigger event inputs on the
card. They must be set to 'On' in order to send the trigger event codes.
ETn (Event Trigger) These are used to program the event codes that correspond to the
trigger event inputs on the card.
VAL Placed into the record to make EPICS happy and is completely worthless.
2.1.2 Record Processing
It is intended that EG records be set to passive processing only. They are not altered by the
device support code in response to being processed. Their purpose is only to specify the
operating modes of the event generator and, as such, are processed if and when a value in
it is altered by a put operation. To start things going, however, they should have their 'pro-
cess at init' flag set to YES.
The Global Event System
March 2, 1994
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Winans, J. The global event system, report, March 2, 1994; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc672996/m1/2/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.