EDOC076

 


Specification of the VXI Readout Mechanism


Version 1.0 - April 1991
Version 1.1 - Oct 14 1998

 

Nuclear Physics Support Group
Central Laboratory of the Research Councils
Daresbury Laboratory


Note: Version 1.1 is an exact conversion of Version 1.0 into html format. There are no changes in contents. Version 1.0 is only available as a postscript file.

Specification of the VXI Readout Mechanism

For phase 1 of the Eurogam project, the line specified as BLTACK* by this specification is re-named Readout* and is used slightly differently. The reason for this and the way in which it is used in phase 1 are explained in Appendix A.

1. Introduction

This document specifies the "REN-Readout cycle" which is used by Readout Controllers to read data from Eurogam VXI modules (currently the Ge, BGO and Master Trigger modules). The REN-Readout cycle is very similar to a normal VMEbus quad-byte block-read cycle, except that: