This contribution deals with the main features and with the hardware modifications of RAM controllers in the dual-port accessed CAMAC memory modules that have been applied in a modular multichannel analyzer instrumentation system. The modules described in this paper are fully compatible with the CAMAC standard EUR 4100 and with the COMPEX draft proposal of the ESONE Study Group, as well. Special attention is paid to the possible application of modern LSI bipolar circuits.
I. Infroduction
32-bit wide VAX computer with a CAMAC interface and with a unibus adapter. Data flow to the A modular experiment multiparameter pulse-VAX computer is through the CAMAC bus conheight instrumentation system was proposed and necting the expandable number of multiparameter built in the Institute of Nuclear Research (Kern-system (MPS) crates [1]. It is possible to combine forschungsanlage) Julich, Federal Republic of from 1 to 16 analogue-to-digital converters into Germany. Such a system serves for computer-one 16 to 128 bit wide data word for an event. controlled spectroscopic measurement in a scien-Other parts of this instrumentation system are tific program, the aim of which is the experimental created by a scaler and by spectra monitor crates. research of nucleon transfer reactions and the
The overall arrangement is shown in fig. 1. measurements of particule spectra from stripping-A parameter position is freely selectable within and pick-up-reactions by means of a magnet spec-the 128 bit maximum word width and any number trograph. The computer control of the instrumen-of bits ranging from 1 to 16 can be set for each tation system is based on the application of parameter. More information can be added to this CAMAC standards on various levels, taking all data word from outside through bit sample inputs advantages of distributed computer intelligence, provided with LEMO-connectors. It is possible to The subject of this paper originates from a par-store temporarily an actual parameter in a correticipation in the development and design of a sponding input unit. One or more digital windows dual-port accessed memory module. This work with variable discriminating levels can be conwas done under the UNIDO Fellowship Training nected to the input unit being plugged into any Program in Zentrallabor für Elektronik Kern-position within the MPS crate. A flag bit can be forschungsanlage Jülich early in 1980.
output at an arbitrary bit position of the data word. The start of an ADC unit or a group of these units can be conditioned by an external 2. Measurement system description coincidence flag. One or more two-parameter coordinate transformation units make the direct con-A magnet-spectrograph-based physical experi-nection possible of a monitor with a point of the ment needs a large amount of spectra evaluation curve delay line to the MPS. and archiving. The modular multichannel analyzer Control functions necessary for data transfer system is connected to an overhead evaluation within such a multiparameter spectra evaluating V. ~karda / CA MAC RAM controllevi READ DATA RAP4-..DATAWAY DATAWAY-.. CAt'IAC CYCLE -~CONTROLLER WRITE DATA CONTROLLER -DATAWAY-.-RAP4 DATA WAY NAF SI 52 -400 200 200 ~4O0.~NANOSEC