1. Design Criteria and Proposal for a CBM Trigger/DAQ Hardware Prototype Joachim Gläß Computer Engineering, University of Mannheim Contents –Requirements from Algorithms and Networks –Design Considerations –Proposal for a Hardware Architecture September 9, 2004Second FutureDAQ Workshop

2. Requirements example: algorithms for D-trigger –tracking of STS using Hough-transform (-> talk this afternoon) –Kalman-filter track following through MAPS (-> talk this afternoon) –primary vertex determination in y-z plane –secondary vertex and invariant mass network –L1 processor network –hypertree readout network event building –active buffer hardware prototype should also be usable and used for implementations of all algorithms and networks Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering

3. Requirements Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering => network Different algorithms -> different hardware => programmable hardware

4. Design Considerations FPGA combines flexibility of programming with implementation directly in parallel hardware processor prototyp hardware testbed for all algorithms small number of different building blocks system should be capable to assimilate several algorithms as well as the appropriate network at the same time -> test system aspects several FPGAs for algorithms one FPGA for network same type of FPGA to facilitate HDL development and maintanance of the tools Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering

5. Design Considerations > 50,000 logic cells per FPGA from requirements (logic cells in FPGA not 100% utilisable) testing, debugging, embedded CPUs readout, writing of processed data / initialisation data during operation -> VirtexIIpro 4 x 2.5 Gbit/s as substitute for 10 Gbit/s (integrated in VirtexIIpro) external memory 8 x (1M x 16) from requirements Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering

6. Design Considerations network connection to other units –> 1 x 10 Gbit/s = 4 x 2.5 Gbit/s –=> 8 x 2.5 Gbit/s links –enables network topologies apart from star, ring, torus number of FPGAs for algorithms –> 2 (balance between network and algorithm) –max. 4 (complexity of PCB) –1 x 10 Gbit/s = 4 x 2.5 Gbit/s connections –=> 8 – 16 x 2.5 Gbit/s links Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering network

7. Proposal for a Hardware Architecture XC2VP50 –53,136 logic cells –16 x 2.5 Gbit/s links –FF1152 or FF1517 flip-chip ball grid array package –692 or 852 user I/Os XC2VP70 –74,448 logic cells –20 x 2.5 Gbit/s links –FF1517 or FF1704 flip-chip ball grid array package –964 or 996 user I/Os XC2VP100 –99,216 logic cells –20 x 2.5 Gbit/s links –FF1704 flip-chip ball grid array package –1040 user I/Os Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering

8. Proposal for a Hardware Architecture system with 4 x XC2VP70 –extendable to 4 x XC2VP100 –4 x 2.5 Gbit/s per connection Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering

9. Proposal for a Hardware Architecture Alternative systems Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering 3 x XC2VP70 reduceable to XC2VP50 5 x XC2VP70 reduceable to XC2VP50 2 x 2.5 Gbit/s per connection 7 x XC2VP70 extendable to XC2VP100 2 x 2.5 Gbit/s per connection

10. Proposal for a Hardware Architecture Alternative systems Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering 5 x XC2VP70 extendable to XC2VP100 2 x 2.5 Gbit/s per connection 4 x XC2VP70 extendable to XC2VP100 4 x 2.5 Gbit/s per connection

11. Proposal for a Hardware Architecture external memory –8 x (1M x 16) ZBT synchronous SRAM ZBT: read/write access without dead cycles supports > 200 MHz –DDR modules for PPC (?) additional 2.5 Gbit/s links –2 x SFP connectors –additional data input/output –additional network –additional Gb Ethernet interface to/from PC –PCI/X –USB –Ethernet Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering 4 x XC2VP70 extendable to XC2VP100 10 Gbit/s per connection

12. Proposal for a Hardware Architecture Systemsize implement and test several algorithms and network at the same time –test real system aspects workload balancing find bottlenecks early reasonable systemsize –3 – 4 FPGAs for algorithms –1 FPGA for network 1 system – 1 board –NO connectors, cables, backplanes, additional boards –power supply and interfaces (PCI, USB, Ethernet) only once Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering

13. Summary Goals –system has to be flexible and easily adaptable to many different algorithms for all kind of detector types that are needed for triggering –aim is to arrive at a modular solution based on a small number of building blocks that are linked by high-speed interconnects –system should be capable to assimilate several algorithms as well as the appropriate network at the same time Design Criteria (from Requirements) –> 50,000 logic cells per FPGA –testing, debugging, embedded CPUs –4 x 2.5 Gbit/s as substitute for 10 Gbit/s –external memory 8 x (1M x 16) Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering

14. Summary Proposal for Hardware Architecture –system with 4 x XC2VP70 extendable to 4 x XC2VP100 4 x 2.5 Gbit/s per connection –connection from/to board SFP –connections to PC PCI/X USB Gb Ethernet Joachim Gläß, Univ. Mannheim, Institute of Computer Engineering