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*Block diagram of Mini-WR**
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## Connect options.
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Mini-WR provides the following connections:
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*Castellated edge contact**
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2 pairs of differential GTP pairs are linked to the Castellated edge
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contact. SI can be fulfilled by solder the Mini-WR to the carrier board.
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Special PCB cut-out should be implemented on the carrier board due to
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the R/C on the bottom of the Mini-WR.
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GMII signal group, UART, SFP control signals and few debug IO are also
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available.
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*Mezzostak connector**
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Mezzostak - High speed self mating board-2-board connector (
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(10106813-063112LF)) from Amphenol FCI are applied on Mini-WR. Stack
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height from 3mm to 7mm can be adjusted choosing different types.
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Another 2 Pairs of GTP differential signals are linked to the Mezzostak
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connector, and flyby further to the gold-finger connector.
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When use the Mezzostak connector, the additional trace to the
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gold-finger acts as branch. Although our test shows that the signal can
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suffer the small branch, it is still recommended to remove gold-finger
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zone when the Mezzostak connector is used (need to contact the
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producer).
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The 60Pos. Mezzostak connector also provides signals for GMII, UART and
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JTAG.
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*Gold-finger connector**
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The signals connected to 40Pos. Gold-finger are subset of those on the
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Mezzostak connector, without JTAG, UART and few data signals of the
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RMII. The Mezzostak is in the trace path and cause no interference.
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When use the gold-finger, 3 types of MEC1 series connector can be
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used.
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|MEC1-120-02-L-D-A| Vertical |
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|MEC1-120-02-L-D-RA1-SL| Right Angle|
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|MEC1-120-02-L-D-EM2| Edge mount|
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## Firmware
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## Mini-WR-CB
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Mini-WR can not work alone, [Mini-WR-CB](/mini-wr-cb) (Mini-WR Carrier
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Board) must provide power supply, mating connector and SFP modular to
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serve the Mini-WR.
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## Project information
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- Firmware
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- [Mini-WR-CB](Mini-WR-CB)
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- [Production
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documentation](https://www.ohwr.org/project/mini-wr/tree/master)
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- [Frequently Asked Questions](/FAQ)
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