The EMTF is one of the custom-built electronic systems of the CMS Level-1 Trigger (L1T). By means of pattern recognition EMTF combines multiple track's segments produced by a particle in sensitive regions of the detector and evaluates track's properties. The most important property, the particle's momentum (or transverse momentum), is evaluated from track's bending in the inhomogeneous magnetic field.
The EMTF system is controlled and monitored via PCI express (PCIe) connection to a regular PC running the EMTF cell instance. EMTF cell is a system-specific implementation of SWATCH cell. EMTF cell provides an expert-level interface to the system and in the same time allows the central SWATCH framework to orchestrate all systems of the L1T coherently. Current repository contains the EMTF cell implementation.