RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

• Status report on RPC FEB production• Status report on RPC Distribution Board• Interfaces RPC-LB

RPC electronics statusRPC electronics status

Flavio Loddo

I.N.F.N. Bari

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

Barrel FEB Production Barrel FEB Production statusstatus

• All the Barrel FEBs produced and tested (5500)

• The Boards classified according to the delay time in steps of 250 ps --> Time code produced

• Boards with the same time code are mounted on the 6-FEB rows

• Test & classification results logged into Barrel RPC production Database (www.ba.infn.it/rpc)

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

Barrel FEB Production Barrel FEB Production statusstatus

16 inputs from strips

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

Barrel FEB DatabaseBarrel FEB Database

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

EndcapEndcap FEB Production status FEB Production status (PK (PK responsability)responsability)

• 50 Endcap FEBs produced and used during 2002 Test Beams• Mechanical problems (poor locking) on the input connector

other connectors under evaluation

32 inputs from strips

MLink Board

SLink Board

DistributionBoard

Backup I2C busfrom DT (for 2 RPC’s)

FEB

FEB

RPC

LV1

LV2

LV3

MUX

(I2C from LB)

(Backup I2C)

I2C (LVDS)

LV input cable

Signals + test pattern cable

I2C connector

LV input

FieldbusOPTO

BarrelBarrel Distribution Board Distribution BoardFull production: done (450 boards)

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

BarrelBarrel Distribution Board Distribution Board

Power Connector

I2C Conn.

(Sec. 1-2,DT)

I2C Conn.

(Sec. 3)To FEB row # 3

To FEB row # 1

To FEB row # 2

Dim: 13 x 21 cm2

(including connectors)

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

EndcapEndcap Distribution Board Distribution Board (PK (PK responsability)responsability)

Power ConnectorI2C Conn.

To FEB row # 1

To FEB row # 2(to be used only in RE2/1)

Dim: 7.8 x 5.9 cm2

Power: ~ 100 mW

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

Interfaces RPC-LBInterfaces RPC-LBRPC-LB interfaces

FEB-LB

1. FEB -> LB:

16 LVDS output signals

2. LB -> FEB:

4 LVDS Test Input

(1 per 4 channels)

All available on the same 40-pin Scotchflex connector

Distr.Board – Control Board

(Slow Control)

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

RPC Distr. Board-LB Control RPC Distr. Board-LB Control BoardBoard

• The Control Board sends remote control to RPC via I2C bus

• One I2C line can control up to 8 Barrel FEB or 4 Endcap FEB

Barrel: 12 (18) FEBs/Chamb.

We need:

• 15 lines in sectors 4,10

• 12 lines in sectors 9,11

• 13 in the other barrel sectors

Endcap: 8 FEBs/RE2/1

3-4 FEBs elsewhere

We need:

• 1 line for each chamber, including RE2/1 where we use I2C Mux to address 2 rows

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

RPC Distr. Board-LB Control RPC Distr. Board-LB Control BoardBoard

• The I2C bus is a local bus running at 100 kbit/s in standard mode

• It consists of 2 serial lines: SCL (uni-directional) and SDA(bi-directional)

•It cannot drive long lines (few meters max) because it suffers of high capacitive loads

• To overcome this limitation, on the Control Board the SDA line is split into 2 uni-directional lines using the Philips component (P82B96) and SCL, SDA_IN, SDA_OUT are sent to RPC in LVDS on twisted-pair cable

•On the RPC Distr. Board they are reconverted into standard I2C and sent to FEBs

• This link (25 meter cable) was tested successfully during last test beam (I don’t expect problems with longer cables, due the very low transmission rate)

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

RPC Distr. Board-LB Control RPC Distr. Board-LB Control BoardBoard

• The I2C bus is used to set and read-back the Vthresholds and the Pulse widths on the FEBs

• Typical I2C operations are:

1. Write 1, 2 or 3 bytes

2. Read 1 or 2 bytes

• It could not be tested during 2003 test beam due to limitations in the CCU

RPC Trigger ESR Warsaw 08 July 2003 F. Loddo I.N.F.N. Bari

ConclusionsConclusions

• The Barrel electronics was fully produced and is under installation in the detectors

• The Endcap electronics was designed and is ready for production

• During the 2003 Test Beam (25ns beam) were tested successfully:

1. the RPC-LB connection (RPC signals and Test pattern signals)

2. the Control Board-Distr. Board only under the electrical point of view

• More investigations are needed for I2C routines implemented in the Control Board