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WIP: gtp_common: attach GTREFCLK_USED to IBUFDS #1638

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@acomodi acomodi commented Mar 29, 2021

Given that, if an IBUFDS is used, the corresponding GTREFCLK on the GTP_COMMON site will be used as well, it is more convenient to have the GTREFCLK_USED feature within the corresponding IBUFDS_GTE2 site, as there are no routes to connect to the opposite GTREFCLK port in the GTP_COMMON.

E.g.:

┌──────────────────────┐             ┌──────────────────────┐
│                      │             │                      │
│                      │             │                      │
│  IBUFDS_GTE2_1       ├────────────►│ GTREFCLK1            │
│                      │             │                      │
└──────────────────────┘             │                      │
                                     │                      │
                                     │     GTPE2_COMMON     │
┌──────────────────────┐             │                      │
│                      │             │                      │
│                      │             │                      │
│  IBUFDS_GTE2_0       ├────────────►│ GTREFCLK0            │
│                      │             │                      │
└──────────────────────┘             └──────────────────────┘

Given that, if an IBUFDS is used, the corresponding GTREFCLK on the
GTP_COMMON site will be used, it is better to have the feature relative
to the IBUFDS site, rather than the GTP_COMMON one.

Signed-off-by: Alessandro Comodi <[email protected]>
@acomodi acomodi changed the title gtp_common: attach GTREFCLK_USED to IBUFDS WIP: gtp_common: attach GTREFCLK_USED to IBUFDS Mar 29, 2021
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