1. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 The NEMO DAQ electronics: Actual characteristics and new features

2. NEMO tower layout The basic self consistent element is the tower Main components: o Optical module (PMT and FE) o Floor Control Module o Junction Box

3. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 One floor data is received on shore by twin FCM board plugged on host machine Data transmission Optical module data coming from 4 Front End modules (FEM) FEM#2FEM#3 FEM#0FEM#1 Sea Shore Storage and data manager Off shore data concentration is carried out by Floor Control Module Board (FCMB)

4. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 Front End Module Board Signal sampling: double 100 MHz 8 bit ADC’s quasi-logarithmic compression (13 bits) On board calibration circuit PMT HV management Low power Safe configuration from remote Optical Module housekeeping

5. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 Floor Control Module Board Off shore - On shore link FEM interface Fiber Optic interface DWDM transceiver Communication with other electronics: Slow control board Time Calibration Other features: Safe remote reconfiguration

6. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 Floor Control Module Board data bridge Electrical Interfaces for 4 Optical Modules (up to 8) 3 Differential Lines:  Tx Clock line (5 MHz)  Tx Data line (5 Mbps)  Rx Data line (20 Mbps) Spartan-3 FPGA bridges optics and OMs Electro-Optical Interface: Ser-Des (up to 1.4 Gbps) + DWDM compliant Transceiver

7. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 Freescale DSP56301 with PCI 32/33 interface: Board Debug System control and management On-shore data and slow control extraction Measured sustained performance: 60MBps Slow Control board connector: electrical link with SPI interface Time calibration connector: set calibration parameters trigger optical pulses to OMs Power Area: linear LDO regulators to minimize noise. On-shore Clock Input Floor Control Module Board interfaces

8. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 Clock distribution: On shore Time station (GPS) Slow clock PLL Sys clock Data Data + clk to off shore Sys clock

9. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 Clock distribution: Off shore Sys clock Data Data + clk from on shore Clock and data on the same fiber

10. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 The FCMB for NEMO phase 2 FE embedded on FCMB New AD converters: one 12 bit 200 MHZ ADC per PMT New on shore interface (1 Gbit Ethernet or PCI Express) Secondary Junction-Box Tower Base FCM (Floor Control Module) OM-PMT Analog signals electrical link Optical link 40m 150m Floor 16 Floor 15 Floor 2 Floor 1 PMT1 PMT2 PMT3 PMT4 10m

11. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 The new FCMB

12. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 NEMO phase 2 FE embedded on FCMB One 12 bit 200 MHZ ADC per PMT Gbit Ethernet or PCI Express on shore interface DC/DC power FE into OM Two 8 bit 100 MHZ ADC’s per PMT PCI on shore interface AC/DC power NEMO phase 1 VS

13. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 The next phase: Copper data link Secondary Junction-Box Tower Base FCM (Floor Control Module) OM-PMT & FE electronics Analog signals electrical link Optical link 40m 150m Floor 16 Floor 15 Floor 2 Floor 1 PMT1 PMT2 PMT3 PMT4 10m

14. stefano russo Universita’ di Napoli Federico II & INFN Km3Net meeting Pylos 16–19/4/2007 The next phase: Copper data link