RHIC Timeline System Page: 4 of 7
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1.2 EVENT ENCODER MODULE
The event encoder module is used to transmit RHIC event codes on the RHIC timeline.
The encoder module is connected to a 16-position event input module bus. An event input
module determines the relative priority of its 16 event trigger inputs. If triggered, the event input
module delays 1.3 usec, and attempts to place its highest priority event trigger on the input
module bus. However, the event input modules are part of a serial, daisy chain, priority scheme.
Thus, if other event input modules have been triggered, the event input module must have
position priority (closest to the encoder module) in order to place its event trigger code on the
The event trigger with the least numeric value has the highest priority. The event encoder
module converts event trigger inputs into RHIC event codes in a translation table. The event
code is input to a serial non-return-to-zero to bi-phase-mark converter for transmission on the
When the event encoder module receives an event trigger available from an event input
module the following occur:
a. The event trigger code is loaded into a temporary buffer.
b. The event trigger code translated into an event code.
c. The event encoder module sends a BUSY signal to the highest priority event input
module, disabling the priority chain while the transmission is in process.
d. The translated event code is input to a serial non-return-to-zero to bi-phase-mark
converter. As the code is serialized, a "zero" start bit is added, and code parity
(even) is generated. The output of the bi-phase-mark converter is transmitted over
the RHIC timeline.
e. The BUSY signal is terminated at the end of the event code parity bit transmis-
sion. This allows the event input module priority system time to determine the
next event trigger (if any) to be transmitted by the encoder module, and maintain
f. The minimum inter-event code transmission headway is two bit times (two bi-
1.3 EVENT INPUT MODULES - EVENT INPUT MODULES
Each event input module accepts up to 16 event trigger inputs, and determines their
relative priority. Event input module channel 0 has the highest priority and channel 15 the lowest
priority. Sixteen input modules are required to support 256 events.
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R., Conkling C. & Oerter, B. R. RHIC Timeline System, report, August 4, 1994; United States. (https://digital.library.unt.edu/ark:/67531/metadc864830/m1/4/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.