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# Mini-WR
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## Introduction
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The Mini-WR is a plug\&play mini-module for flexible integration of
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White Rabbit functionality of boards. The carrier board of the Mini-WR
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should implement the fibre-optic SFP connector.
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The [Cute-WR-DP](https://www.ohwr.org/project/cute-wr-dp/wiki)
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implements similar functionality.
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*TEMPLATE BELOW, PLEASE
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MODIFY**
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![](/project/cute-wr-dp/uploads/c9c1d06426079bf7f5ff1b1fc5b0c25d/Cute-WR-DP__block_diagram.jpg.png)
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The two ports can act in different modes:
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*Parallel mode (Cute-WR-DP-PM)**
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In PM mode both port acts as down-link port connect to different WRS,
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provide redundancy to improve the relibility for safety related
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applications. Two WRPC work simultaneously on each port, the switch over
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efforts developed on WRS can be adapted.
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*Chain mode(Cute-WR-DP-CM)**
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In CM mode, two ports act as one down-link and one up-link to support
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cascade topology.
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The CUTEWR-DP board can also be used as normal WR node when only one
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port is used.
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## Hardware
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<table>
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<tbody>
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<tr class="odd">
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<td>/5617
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<td><img src="/project/cute-wr-dp/uploads/1314fadacca2def3e9c0ee5a4c3b3c60/Top_view.png" alt="" /></td>
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</tr>
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<tr class="even">
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<td><strong>Isometric view of Cute-WR-DP</strong></td>
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<td><strong>Top view of Cute-WR-DP</strong></td>
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</tr>
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</tbody>
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</table>
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## Features:
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- 3.3v power supply, 1.5A
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- VITA57 FMC mezzanine
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- Two WR compatible SFP sockets
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- Spartan 6 (XC6SLX45T-4CSG324C)
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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 following the VITA standard
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- JTAG connector
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- USB-UART port
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- External CLK reference (work in master mode)
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- Adjustable CLK output (optional)
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- 2 USER IO on front panel, LEMO interface
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- 2 front panel LEDs
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- the following features are not compatible with VITA standard,
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will be removed in next version
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- 2 Pmod Interfaces for debug
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- 3 LEMO Interfaces for debug
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- Addition Low-cost connector on FMC Region3
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## Firmware
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![](/project/cute-wr-dp/uploads/e0868cff1a89ea94f2fd21d06e77f37e/dual_port_structure.png)
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The firmware is based on WRPC with modified code in the LM32 softcore.
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The additional resource cost to support Dual Port is not twice of the
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single port.
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## Project information
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- [Hardware design
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files](https://github.com/leehongming/cutewr_dp_hw.git)
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- [Firmware demo
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project](https://github.com/leehongming/cutewr_dp_v2.git)
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- Follow the
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[instructions](https://www.ohwr.org/project/cute-wr-dp/wikis/cute-wr-dp-demo)
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to run the project.
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- [Users](Users)
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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>19-Mar-2018</td>
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<td>Project started on ohwr</td>
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</tr>
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</tbody>
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</table>
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## Contacts
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### Commercial producers
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[SyncTech](http://www.synctechnology.cn) - a spinoff company from THU
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### General question about project
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- [Guanghua Gong](https://www.ohwr.org/users/925) - Tsinghua
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University, Beijing
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-----
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19 March 2018
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