LHCb level-1 vertex topology trigger

99-031 LHCb Level-1 Vertex Topology Trigger This document specifies the functional and technical requirements of the level-1 vertex trigger. It tries to do this without specifying details of its implementation. The level-1vertex trigger has also to interface with various components developed by other LHCb collaborators. The definition of requirements for these external interfaces is essential to particularize their task and to ensure interoperability. In order to resolve ambiguities and uncertainties of the external interfaces an implementation of them is added to the requirements. Many of the system parameters are not final. For example the geometry of the vertex detectors themselves are being discussed to be modified. Therefore all requirements are justified with respect to the driving input parameters, which shall allow to immediately identify the impact of a given change.