RHIC Timeline System Page: 3 of 7
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TTL, regenerated (restoring wave shape and timing), and buffered as differential TTL. Again
the fanout/repeater is used to produce multiple outputs. General purpose decoder/delay modules
may be located in these remote locations, as well as other specially designed modules having
direct timeline inputs (e.g. the waveform generator).
The decoder/delay modules accept the RHIC event timeline transmission, decode selected
event codes, and generate TTL compatible event pulses following individually programmable
delay intervals. The module outputs have 50 ohm drive capability. It is recommended that
equipment using these event pulses provide optical isolation to eliminate ground loops.
start 1 0 1 1 1 0 1 0 1 11 0 stop Istop
RHIC Timeline Event Transmission
RHIC Timeline Event Code Transmission
The event codes are transmitted using a serial modified Manchester code (bi-phase-
mark). The transmission rate is 10 Mbits/sec, and 1.2 usec are required to transmit an event
code. The event timeline contains a continuous bi-phase-mark "ones" transmission during idle
periods. A single event code transmission is shown in figure 2.1-2.
There is a 1.3 usec event code transmission delay built into the event encoder system.
This assures that very high priority events will be transmitted with minimum time jitter (-0,
+100 nsec). If a higher priority event trigger is received while a lower priority event trigger is
being delayed, the delay is reset, and the high priority event code will be transmitted before the
low priority event code.
RHIC event codes can be permanently assigned without regard to their timeline
transmission priority level. The event encoder module contains an event trigger to event code
translation table. This table allows an event code trigger priority level to be adjusted relative to
other event codes without changing the event code.
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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/m1/3/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.