G. Antchev, L. Pollet, A. Racz*
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In a first part, steering principles for sub-detector/DAQ communication
are presented. In order to ease system integration, the concept of a
uniform interface for all sub-detectors has been adopted for CMS. A set
of minimum requirements has been established and a common inplementation
for these minimum requirements is proposed. 
In a second part, reconfigurable hardware platforms developped by the 
CMS DAQ group are presented. Thanks to the on-board programable logic, 
these platforms are used by the sub-detectors but also by other groups
to develop their specific applications. An overview of these applications
is given.
Finally, the latest evolution of the platform is presented. The 
versatility of the platform has been increased by using co-planar 
extensions where application specific hardware can be added. A
200m-400MB/s data link based on this platform is described.
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In the context of large data acquisition systems for LHC experiments, flexible and uniform interfaces between subsystems is a key feature to ensure best possible system integration/maintenability and a clear system upgrade policy. This approach is widely used in CMS at the border between sub-detectors front-end and the DAQ. Common requirements and reconfigurable hardware used in CMS DAQ are presented in this article.
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