diff options
Diffstat (limited to 'fpga_interchange/site_router.cc')
| -rw-r--r-- | fpga_interchange/site_router.cc | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fpga_interchange/site_router.cc b/fpga_interchange/site_router.cc index cae81d52..12dce9f5 100644 --- a/fpga_interchange/site_router.cc +++ b/fpga_interchange/site_router.cc @@ -1092,7 +1092,10 @@ static void block_lut_outputs(SiteArch *site_arch, const pool<std::pair<IdString } } -// Block outputs of unavailable LUTs to prevent site router from using them. +// Block wires corresponding to dedicated interconnections that are not +// exposed to the general interconnect. +// These wires cannot be chosen for the first element in a BEL chain, as they +// would result in an unroutability error. static void block_cluster_wires(SiteArch *site_arch) { const Context *ctx = site_arch->site_info->ctx; |