# Presentation: 352587

## BTeV Front End Readout&Links

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000

## BTeV Front End Systems Summary 

_**System   Channels     FEBs                           FEB Components       **_
- Muon    	 69120	        32ch overthreshold	ASDQs, DACs, ADCs
- RICH   	 349146	        163ch overthreshold   	IDE, DACs, ADCs
- EM Cal  	 23712	        32ch @ 11 bits each   	QIE, FADC, DACs, ADCs
- Straws 	 118464	        32ch @ 6 bits each	ADSQs, TDCs, DACs, ADCs
- Pixel
- Strips

- Six BTeV detector sub systems:

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000

## Front-End Readout Architecture

- Front-End Boards (FEBs) digitize multiple analog   detector signals
- Data Combiner Boards sparsify, combine, and format the data into data blocks for each BXNG.
- Data blocks are sent via high speed serial link with BXNG time stamp.

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000

## Muon System Example

- Digitized detector data is overthreshold (ASDQ)
- Each FEB is 32 channels.  32 channels equals 1 plank.
- 69120 System Channels Total
- 2160 FEBs
- 13 FEBs for each DCB. 13 FEBs equals 1 octant.
- 167 DCBs

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000

## Muon System Example

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000

## Data Combiner Board (Muon DCB Shown)

- System clock recovery
- Receive/decode control commands
- Combine/format data from 13 FEBs (TMC2 FPGA)

- Return Monitoring Data
- Different sized boards for different systems

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000

## TMC2 FPGA

- TMC2 = _T_iming, _M_onitoring, _C_ontrol, and _C_ombining
- Different size and slightly different firmware for each system

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000

## Optical Links

- Optical links will be standard across all systems

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000

## Summary of Other Systems

- RICH: DCB combines 6 FEBs.  Each FEB is 163 channels.
- Straws: DCB combines 8 FEBs.  Each FEB is 32 channels.
- EM Calorimeter:  DCB and FEB are combined into a single board.  Each DCB/FEB is 32 channels.

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000

## FEB/DCB Functional Summary

- Front End Boards (FEBs) digitize detector data every beam crossing (132ns) and send all data to a Data Combiner Board (DCB).
- DCBs connect multiple FEBs.  They receive the digitized detector data, combine all data (sparsified) from the same BXNG and send it as a data block to the L1 Buffer (or trigger) via a 2Gbps optical serial link.
- DCBs receive timing and control commands from a control/timing link, control FEB components, and return monitoring information back to the BTeV Timing/Control and Monitoring System.

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000

## Key Advantages

- Greatly reduce cable mass by combining data from many detector channels close to the detector into a single high speed optical data link.
- Architecture allows for “simple” FEBs resulting in higher reliability in difficult to access areas.
- Standard optical components (data link, control/timing link, and monitoring link) allow for interchangeable parts across systems and less development/debug time.
- TMC2 FPGA is functionally similar across each system allowing for common firmware resulting in less development/debug time.

- BTeV Front End Readout & Links

- B. Hall   17 Aug 2000