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# Compact Universal Timing Endpoint Based on White Rabbit
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## Introduction
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The cute-wr project is a standalone White Rabbit Node implementation on
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a FPGA Mezzanine Card. The idea is to have a compact, low-cost and
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common WR NIC for synchronous DAQ frontends and other applications.
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## Structure Design
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cute-wr is originally derived from and keeps firmware compatibly with
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the [SPEC](https://www.ohwr.org/project/spec/wiki) board. The [White
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Rabbit Node Reference
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Design](https://www.ohwr.org/project/white-rabbit/wikis/WRReferenceDesign)
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has detailed information on infrastructure
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design.
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## Features:
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- Standalone Operation;
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- Spartan 6 (XC6SLX45T-3FGG484C);
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- 32MBit SPI FLASH (M25P32-VMF6P);
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- 64Kbit I2C EEPROM (24AA64T-I/MC);
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- FMC LPC interface;
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- JTAG and RS232;
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- External CLK reference (work in master mode);
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- 125MHz CLK and PPS output;
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- 3 user LEDs;
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## Application orientation
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Timing distribution for LHAASO Project:
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Please refer to:
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- [The proposed Large High Altitude Air Shower Observatory (LHAASO)
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project](http://english.ihep.cas.cn/ic/ip/LHAASO/)
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- Guanghua Gong, Shaomin Chen, Qiang Du, Jianming Li, Yinong Liu,
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Huihai He, [Sub-nanosecond timing system design and development for
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LHAASO
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Project](http://www.esrf.eu/icalepcs2011/papers/webhmult04.pdf) , in
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Proceedings of ICALEPCS2011, Grenoble, France, 2011
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## Current status
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<table>
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<tbody>
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<tr class="odd">
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<td><strong>Date</strong></td>
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<td><b> Event </b></td>
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</tr>
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<tr class="even">
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<td>20-10-2011</td>
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<td>Start of project. Framework design finished.</td>
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</tr>
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<tr class="odd">
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<td>29-11-2011</td>
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<td>Schematic and PCB drawing reviewed.</td>
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</tr>
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<tr class="even">
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<td>15-02-2012</td>
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<td>PCB fabrication and assembly finished in Tsinghua.</td>
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</tr>
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<tr class="odd">
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<td>12-03-2012</td>
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<td>Start of the project management cute-wr on ohwr.org.</td>
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</tr>
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<tr class="even">
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<td>14-03-2012</td>
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<td>First demo worked together with WR switch and SPEC.</td>
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</tr>
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<tr class="odd">
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<td>12-05-2012</td>
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<td>In-depth development and test with wr-cores::spll_ng branch, getting ready to publish a separate branch for cute-wr and other compact, standalone WR reference designs.</td>
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</tr>
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<tr class="even">
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<td>12-06-2012</td>
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<td>Presented at IEEE realtime 2012 conference at Berkeley. [Development of White Rabbit Interface for Synchronous Data Acquisition and Timing Control](https://www.ohwr.org/project/white-rabbit/uploads/0f7e470f2701f6d499b3188602ebb85a/RT2012_PS2_10.pdf)</td>
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</tr>
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<tr class="odd">
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<td>10-25-2012</td>
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<td>Release of cute-wr v2.0</td>
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</tr>
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</tbody>
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</table>
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## Users list
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- [Large High Altitude Air Shower Observatory (LHAASO)
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project](http://english.ihep.cas.cn/ic/ip/LHAASO/)
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- [Daya Bay Reactor Neutrino
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Experiment](http://dayabay.ihep.ac.cn/twiki/bin/view/Public/)
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- [China JinPing underground Laboratory
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(CJPL)](http://wwwgerda.mppmu.mpg.de/symp/03_Yue.pdf)
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- [Lawrence Berkeley National Lab (LBNL)](http://www.lbl.gov)
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- [Facility for Rare Isotope Beams (FRIB)](http://www.frib.msu.edu/)
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- [American Biomedical
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Group(ABGI)](http://www.americanbiomedicalgroup.net/)
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cute-wr\_v2.jpg
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Version 1.0 has been tested on March 5, 2012, and showed a similar
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performance comparing with SPEC boards.
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Version 2.0 tesetd on Oct, 25, 2012, tested under wrpc-sw and wr-cores
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(branch:cute-wr).
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