IGLOO2 FPGAS IN MUON SYSTEM - Indico...‘3b010 ‘3b011 sw_pulse ‘3b100 ‘3b101 BC_PULSE CLK 40 SCL I2C SLAVE SDA Signal Generator strobe, int_ADDR, WE_ data_in[7:0], data_out[7:0]

IGLOO2 FPGAS IN MUON SYSTEM

Valerio Bocci

INFN Roma

LHCb electronics-FPGAs, 11th Feb 2016

LHCb Muon Chamber FE control

Valerio Bocci LHCb electronics-FPGAs, 11th Feb 2016

THE FLASH FPGA ARE ORDERS OF MAGNITUDINE MORE RESISTENT THAN SRAM FPGA.IN LHC MUON ENVIRONMENT NO SEU EFFECT IN THE CONFIGURATION SIDE

There is no problem in the program side.

Flash assure that the functionality still the same

It is not the case of SRAM FPGA (like Xilinx ,Altera) where

also the program side is affected of SEU and some technics

must be used to refresh the configuration .

(V.Bocci et al https://cds.cern.ch/record/529388/files/p137.pdf)

This was the reason why we were one of the first group in HEP (probably the first)

to use FPGA with flash tecnology (in 2003).


https://cds.cern.ch/record/529388/files/p137.pdf

FOR THE LOGIC SIDE WE USE SAME TECHNICS OF ASIC CHIP LIKE TMR (TRIPLE MODULE REDUNDANCY )

• In the old muon front end control system all the registers are TDR, State machines , internal registers

• In any case for muon Front END we have not data processing but only controls.

• if a read or write operation fail we can redo without impact In the data acquisition


FEB CONTROL AND PULSE DISTRIBUTION

12 x ( I2C+TST signal )

Up to 8 Cardiac Board for each lvds i2c branch

I2c LVDS signals:SCL,SDAin,SDAout

LVDS TST pulse,TTL Reset

Read Write Dialog Registers

Send pulse to measure rate,

calibrate DLL,sync pulse, RESET FEB


int_pulse

clk40

reg_i2c_pulse

BC_pulse

REG_TEST_PULSE_SEL[1:0]

test_pulse

‘2b00

‘2b01

‘2b10

‘2b11REG_PULSE[0]

int_pulse

dly_pulse

div_pulse

REG_INT_PULSE_SEL[2:0]

‘3b000

‘3b001

‘3b010

‘3b011

sw_pulse

‘3b100

‘3b101

BC_PULSE

CLK 40

SCLI2C SLAVE

SDA

Signal

Generator

strobe, int_ADDR, WE_

data_in[7:0], data_out[7:0]

async_start_stop

sync_start_stop

sw_start_stop‘3b110

NC

Start_Stop_Gen

APA150

ELMB_CTRL 0_15

SN1-5

OR4

AND4

REG_ELMBRST_MSKREG_ELMBRST

ELMB_RST(MRD)

CLK_QTZ


NEW PULSE DISTRIBUTION MODULE SINGLE GBT

GBT

2 LVDS

40 MHz

Machine

CLKBC

counter

2 LVDS

Sync

BC

pulse

GBT

Fiber

BC

Pulse

Generator

(IGLOO2)

I2C

16 x

E-Link

80Mbits/s

GBT-SCA


New Service Board Module(multiple GBT old Backplane)

CLK40

BC Pulse

Test/pulse

SCL

SDA_IN

SDA_OUT

Test/Pulse

RESET

ttl/lvds

converter

Test/pulse

Test/pulse

Test/pulse

3x

LVDS I2c

each ELMB

test

pulse

logic

1

2

3

1

2

3

1

2

3

1

2

3

GBT-SCA

Long line I2CFE converter

FlashFPGA

IGLOO2FPGA

E-Link 80 Mbits/s

12 x I2C

lines

I2C





IGLOO2 BREAKING NEWS FROM MICROSEMI(HTTP://WWW.MICROSEMI.COM/DOCUMENT-PORTAL/DOC_VIEW/134103-IGLOO2-AND-SMARTFUSION2-FPGAS-INTERIM-RADIATION-REPORT )

• Microsemi radiation test Document published in OCTOBER 2014

• Important information: Expected same results from IGLOO2 and Smartfusion 2 (they use same technology and process)

• Very poor statement -> usable with radiation level in aviation application and ground level (“For flight-critical applications, mitigation of data upsets in flip-flops and SRAM blocks is

advisable”).

• Tested from microsemi with 24 MeV protons. -> “non-destructive latch-ups in heavy ion radiation testing, at energy levels low enough to cause concern in low earth orbit (LEO) space applications”.

• “SEL onset threshold is in excess of 20 MeV-cm2 /mg, and that single-event latchups have not been observed at energy levels relevant for aviation applications”


http://www.microsemi.com/document-portal/doc_view/134103-igloo2-and-smartfusion2-fpgas-interim-radiation-report

• M2A02 previous run 1Gy in 3.5 fb-1 => 0.3 Gy/fb-1(dosimeter measuraments)

• Aspected dose in LHCB upgrade X 3 (1.5 (collision)*2 (location)) => 0.9 Gy/fb-1 => 4.5 Gy/year

• Aspected integrated luminosity 50 fb-1 => 45 Gy

• The previous calculation are without safety factor.

• If we consider a safety factor 2 we have 90Gy = 9 Krad

• Warning from a preliminary test one FPGA lose programmability at 25 GyChengxin Zhao https://indico.cern.ch/event/299180/session/5/contribution/73/material/slides/0.pptx

• IGLOO2 sample failed at 1000 Gy and one SmartFusion at 380 Gy (Chengxin Zhao https://indico.cern.ch/event/299180/session/5/contribution/73/material/slides/0.pptx)


Total ionizing dose expected in nSB system and IGLOO2 problems

https://indico.cern.ch/event/299180/session/5/contribution/73/material/slides/0.pptx

The expensive RTG4 the radiation tolerant version of IGLOO2

Can we expect a better IGLOO2 in the future from the TID point of view ?

No because the a better IGLOO2 exist is the RTG4 G150 very expensive (The price is order of 15Keuro-20 KEuro piece )


CONCLUSION FOR LHCB MUON CONTROL SYSTEMAT FEB 2016

• We are confident in the use of FLASH based FPGA.

• In our case the TMR is enough strong to correct Filp- flop SEU.

• In any case our apparatus it is non envolved in Data Acquisition flow but only in configuration and monitoring (we are able to do retry operation in case of SEU) .

• The result coming from first test are only indicative we need more data from radiation test and from LHCb simulation

• We are not able to perfom test alone (not enough human resource) but we are interested to help/participate to define and build test setup for radiation campaign.


Documents

IGLOO2 FPGAS IN MUON SYSTEM - Indico...‘3b010 ‘3b011 sw_pulse ‘3b100 ‘3b101 BC_PULSE CLK 40 SCL I2C SLAVE SDA Signal Generator strobe, int_ADDR, WE_ data_in[7:0], data_out[7:0]