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\* Aim: smooth replacement of existing SPEC that is a cheap *Simple FMC
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carrier with WR support*.
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* It is believed that an ADEV of 1e-13 over 100 sec should be
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achievable on the SPEC7 if the same oscillator is used as in the [WRS
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Low-Jitter
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Daughterboard](https://www.ohwr.org/project/wrs-low-jitter/wiki) (a
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4-layer PCB).
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* The existing SPEC with WRS are the two flagship OH projects and the
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SPEC7 therefore may not fail as project.
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| ... | ... | @@ -99,8 +105,8 @@ alternative. |
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- cf.
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[XC6SLX45T-3FGG484C](https://www.eciaauthorized.com/en/search/XC6SLX45T-3FGG484C)
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on SPEC: (~84 Euro without STEP pricing)
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- 8 GTX Transceivers max (4 used for PCIe, 1 for SFP, *only 3
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left for FMC and SATA*).
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- 8 GTX Transceivers max (4 used for PCIe, 1 for SFP, 1 for
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FMC <s>as on SPEC</s> and 2 for SATA).
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- A 70T in FBG484 package cannot be used as has only 4 GTX
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Transceivers (No need to check if can be used on
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footprint of FBG676)
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| ... | ... | @@ -120,7 +126,9 @@ alternative. |
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Euro)
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- [XC7A100T-2FGG676C](https://www.eciaauthorized.com/en/search/XC7A100T-2FGG676C)
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(~180 Euro)
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- FBG484 package allows only 4 GTX transceivers (x1 PCIe?).
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- FBG484 package allows only 4 GTX transceivers (1 used for PCIe
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1x(\!), 1 for SFP, 1 for FMC <s>as on SPEC</s> and only 1 for
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SATA instead of 2).
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<!-- end list -->
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| ... | ... | @@ -207,16 +215,15 @@ alternative. |
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### SATA
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- Cannot have SATA anymore?
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- Proposed Xilinx has only 8 GTX Transceivers max (4 used for
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PCIe, 1 for SFP, *only 3 left for FMC and SATA*)
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\* Cannot have SATA anymore?
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<!-- end list -->
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*\* 8 GTX Transceivers max (4 used for PCIe, 1 for SFP, 1 for FMC
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<s>as on SPEC</s> and 2 for SATA).
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- Liked to keep same two SATA connectors as on SPEC.
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- Keep same two SATA connectors as on SPEC.
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- Planned to be used on SPEC for daisy-chaining triggers between
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SPECs with FMC-ADCs with modified gateware. However, until now
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not used.
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SPECs with FMC-ADCs with modified gateware. However, no users
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that we know of (external users possibly?)
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- Is a connector specifically for internal use (i.e., not
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panel-mounted).
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- May be used as well for digital interface for external PLL loop.
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| ... | ... | |
