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## Project description
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*The FMC PCIe Carrier called SPEC7 is an FMC carrier that can hold one
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**The FMC PCIe Carrier called SPEC7 is an FMC carrier that can hold one
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FMC card and an SFP connector.**
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This board is optimised for low jitter and cost and is usable with most
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of the FMC cards designed within the OHR project (e.g. ADC cards, Fine
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Projects](https://www.ohwr.org/project/fmc-projects).
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![](https://www.ohwr.org/project/spec/uploads/23a127884e2820d707e58c6119cde69d/spec_v1.1_top.JPG)
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*The SPEC7 will be a follow-up of the [*SPEC
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**The SPEC7 will be a follow-up of the [*SPEC
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board*](https://www.ohwr.org/project/spec/wiki) (shown)**
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-----
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- ***Under discussion. Possibly only GTX lines connected and Vadj
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fixed at 2.5V (23/10/18)***
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- Vadj <s>programmable at 1.8V and</s> 2.5V.
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- \*1.8V not possible due to LVDS level restrictions on the
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- *1.8V not possible due to LVDS level restrictions on the
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7-series HR-IO banks, as can be read on page 91 of the
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[manual](https://www.xilinx.com/support/documentation/user_guides/ug471_7Series_SelectIO.pdf#page=91/.)*
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- 2.5V can only be used with a LPC FMC mezzanine: only the LPC
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(APU) (frequency?)
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- 1x 10-280 MHz VCXO controlled by I2C and a DAC with SPI
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interface. Starts up at 100 MHz (Silicon Labs <s>Si571</s>
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***Si570 (23/10/18)***, freely usable)
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**Si570 (23/10/18)**, freely usable)
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- 1x 125 MHz TCXO controlled by a DAC with SPI interface (used by
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[White Rabbit PTP
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core](https://www.ohwr.org/project/wr-cores/wikis/Wrpc-core))
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