Introduction

1. Electronics Upgrade Meeting Introduction • The present calorimeter ECS is mainly based on SPECS • Front-end, LED pulsing, HV, Integrators • We suppose that we will keep the rest unchanged • Power supplies (Maraton), Turbines, HCAL rad. Source (CanBus) • SPECS will probably not be supported for the upgrade • Do not want to be alone to maintain SPECS • Follow the overall collaboration → GBT • This is not a problem for systems which have to be re-designed • We would like to keep some of our boards which are based on SPECS Barcelona/Orsay/Annecy

2. Electronics Upgrade Meeting The cases • 3 cases : • Electronics in FE crates and to be re-designed (FEB, control board) • Electronics in FE crates kept and based on a SPECS slave (TVB) • Electronics kept and based on a SPECS mezzanine (e.g. HV) • We have to find a “GBT solution” for all of these cases

3. SOL40 to FE Readout Crate 0 0 0 0 0 0 0 0 0 4 4 4 4 4 4 4 4 4 L L L L L L L L L L L L ECS L L L L L O E E E E E E E E S T T T T T T T T ... FEs FEs FEs FEs ... FEs FEs FEs FEs ... FEs FEs FEs FEs 3

4. SOL40 to FE-CALO Readout Crate Trigger Crate 0 4 0 0 0 0 0 0 0 0 0 4 4 4 4 4 4 4 4 4 G L L L L L L L L L I L L L L L ECS L L L O R E E E E E E E E S T T T T T T T T T ... backplane control TVB FEs FEs FEs FEs FEs FEs FEs FEs FE-CALO (18 Crates) ... backplane TVB control FEs FEs FEs FEs TFC +ECS Calo Control Board: New board New board Old Board Old Board 4

5. TFC protocol to FE-CALO Used in ECAL backplane (old TTC line) NOT used t.b.c. 5

6. BXID in FE-CALO ECS 0 4 L O S Constant latency logic Raw data Synchroniser ... BXID reset NOT used backplane control TVB FEs FEs FEs FEs BCnt ECS Preset ... backplane control TVB FEs FEs FEs FEs TFC +ECS Calo Control Board: New board New board Old Board Old Board 6

7. ECAL/HCAL Backplane Crate ressources Old Board New board 9 TFC signals TVB TVB 9 differencial line (100Ω) TVB reserved (5 diff. line) SPECS bus (5 diff. line) 18 diff. line (100Ω) 18 GBT CLK 16 x 4 diff. line (100Ω) 16 SCA e-link Old Board Upgrade reuse Calo Control Board: New board

8. FE-CALO Link TELL 40 TRIG 40 TELL 40 TELL 40 SOL 40 DATA TFC + ECS object DCS object object TFC + ECS GBT TFC commands GBTX SCA SCA Clock 9 x18 DATA GBT Calo Control Board GBTX Configuration data e-Link SCA monitoring data I 2 C , JTAG… FE FPGA x16 GOL Glue FPGA TVB FPGA x2 ECAL/HCAL Crate x18 8

9. GBT on Calo Control Board Clock[17:0] RepeterClock External clock reference GBT – SCA on FE Board E – Port + GBT-SCA for Calo control Board + Link for TVB (I2C or e-Link) + Calib Board? GBTX e-Link Phase - Shifter CLK Reference/xPLL E – Port GBT – SCA on FE Board ePLLRx E – Port GBTIA CDR DEC/DSCR E – Port data-down data-up Phase – Aligners + Ser/Des for E – Ports CLK Manager clock GBLD SER SCR/ENC E – Port ePLLTx GBT – SCA on FE Board E – Port E – Port Control Logic Configuration (e-Fuses + reg-Bank) GBT – SCA on FE Board JTAG I2C Slave I2C Master E – Port data control I2C (light) clocks JTAG port I2C port 16 e-Link ( 80 Mb/s port) 9

10. ECS register FE-CALO ECS register FE-CALO Readout Crate Trigger Crate 0 4 0 0 0 0 0 0 0 0 0 4 4 4 4 4 4 4 4 4 G L L L L L L L L L I L L L L L ECS L L L O R E E E E E E E E S T T T T T T T T T ... backplane control TVB Calib FEs FEs FEs FEs FE-CALO (18 crates) ... backplane control TVB Calib FEs FEs FEs FEs TFC +ECS New board : ECS register tbd ECS SPI & // register ECS: Same I2C register than now 10

11. Electronics Upgrade Meeting Case 1 : New electronics in crate • Backplane is kept as is but many lines are not necessary anymore • Use them for ECS point to point connections • A new control board must be designed → GBT-ECS fibre connection • GBT receiver on the control board • Propagate e-links on the backplane (SVLS @80MHz → to be tested!) • Receive the signal with a GBT-SCA chip on the boards (FEB) • Generates SPI and // bus for slow control on the FE boards FEB Control Board E-links (point 2 point) GBT-SCA GBT

12. Electronics Upgrade Meeting Case 2 : Old electronics in crate (SPECS Glue) • Some boards should be kept • ECS input is currently SPECS bus • Replace the signal from SPECS frame to I2C frame • This is not obvious : SPECS is here a mono-directional SPECS ! • May have to add a FPGA on Control board to make it transparent for the GBT • Firmware has to be written • Reprogram the SPECS slave to make it a I2C→I2C transmitter (Firmware) • The board directly receives I2C from the control board • GBT-SCA on the control board • Could this solution also be used for case 1 ? FEB Control Board GBT-SCA GBT

13. Electronics Upgrade Meeting Case 3 : SPECS Mezzanine • The SPECS mezzanine have to be replaced by a “GBT equivalent” • This would consist in replacing the SPECS mezza. by a GBT one • Yuri Guz from the calorimeter group volunteered to realize this • Difficulties : GBT frequency, power supply, signal levels,... Bus Bus GBT Mezzanine SPECS SPECS signal GBT optical signal

14. Electronics Upgrade Meeting Conclusion • Those are just ideas • Deeper thinking with experts of the different boards is needed • Preliminary tests are mandatory (usage of the backplane for e-link, clock, ...) • This is heavily connected with the control board design • Could imagine several alternatives and variations • It could be safer to have a bi-directional GBT link per FEB • But costs increases → not the baseline • Plan to use SPI on the FE board • Block already available (LAL) • SPI with addressing and chip select to avoid long frames: • Address: 7 bit for register selection • Chip select: should be generate externally • More than 10 chip select signals needed, not enough in GBT-SCA • GBT parallel bus could be used to generate chip selects • Asynchronous command • Discussion with GBT experts has started • FPGA for ECS needed on the FEB • Reprogram the one of the TVB