Marc Kelly, Maurice Goodrick, Bart Hommels112-12-2008 CALICE / EUDET DAQ – DESY CALICE (ECAL) / EUDET DAQ: DIF and LDA Status.

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Presentation transcript:

Marc Kelly, Maurice Goodrick, Bart Hommels CALICE / EUDET DAQ – DESY CALICE (ECAL) / EUDET DAQ: DIF and LDA Status

Marc Kelly, Maurice Goodrick, Bart Hommels CALICE / EUDET DAQ – DESY Reminder: links in the DAQ System 1.DIF  LDA synchronous, serial link with additional asynchronous pairs. 8B/10B encoded data runs at N*machine clk: frequency MHz (assume 100MHz) HDMI cabling and connectors 2.LDA  ODR Gigabit Ethernet (and TLK2501) serial protocol SFP cage connector supports optical fibre 3.C+C  LDA Compatible with LDA  DIF interface C+C & DIF capable of stand-alone operation

Marc Kelly, Maurice Goodrick, Bart Hommels CALICE / EUDET DAQ – DESY LDA Hardware LDA hardware: Broaddown2 baseboard with Gbit-Eth add-on and DIF links add-on Resolved many hardware issues Latest fix: terminator resistors on Gbit Eth board Hardware works now (!) M. Kelly (Manchester)

Marc Kelly, Maurice Goodrick, Bart Hommels CALICE / EUDET DAQ – DESY LDA Firmware While struggling with hardware: good firmware progress Gbit Eth now up&running: auto-negotiates link and subsequently sends packets through Ethernet switch LDA-DIF interface ready, debugging (partly?) done DIF-side of link firmware ready as well Documentation available on web:

Marc Kelly, Maurice Goodrick, Bart Hommels CALICE / EUDET DAQ – DESY DIF, and DIF-LDA link status LVDS over HDMI link test: pseudo-LDA sends CLK & 8B/10B 100MHz over AC-coupled LVDS lines DIF pseudo-LDA HDMI cable AC-coupling adapter 5 DIFs produced, parts available for 5 more. DIF hardware is (at least partly) functional M. Goodrick, B. Hommels (Cambridge) Power consumption vs. link frequency: relatively small power penalty from 50MHz=>150MHz

Marc Kelly, Maurice Goodrick, Bart Hommels CALICE / EUDET DAQ – DESY DIF-LDA link: AC-coupling ‘Traditional’ AC coupling is OK for clocks, but not for data. Long absence of transitions leads to link being ‘blind’ to first few bits arriving Solution is to use a feedback system: edge-detector or bus keeper Works well, but needs tuning of RC time constant w.r.t transmission frequency Continuous sending of idle characters might circumvent the issue altogether

Marc Kelly, Maurice Goodrick, Bart Hommels CALICE / EUDET DAQ – DESY DIF hardware: plans DIF re-spin for EUDET readout, should have smaller form factor. No external SRAM (6) No user connector (9) No reset button (10) No USB? (4, 8) SPI-flash PROM (5) Flash RAM for VFE config Include advanced AC-coupling option (2) Probably smaller FPGA (7)

Marc Kelly, Maurice Goodrick, Bart Hommels CALICE / EUDET DAQ – DESY DIF firmware status 2m HDMI 50MHz 15m HDMI 50MHz DIF firmware test bench: Pseudo-LDA with clock generation, full-duplex 8b/10b data transmission machinery DIF running link firmware as development platform for DIF firmware. Initial task: send pseudo-data packets for DAQ system test First –and very primitive- data transmission from dev. DIF to LDA

Marc Kelly, Maurice Goodrick, Bart Hommels CALICE / EUDET DAQ – DESY DIF  LDA link protocol DIF  LDA protocol layer: Mathias took initiative to start ‘user guide’ writeup Lively exchange of s within DIF WG resulted in draft.v7. For further details: see Mathias’ talk DIF next steps:  Implement minimal set of DIF commands in firmware for DAQ test  Extend firmware towards full DIF command functionality