Abstract: A survey rod boot utilized with a survey rod, wherein the survey rod includes a rod support body defining a receiving aperture disposed on an upper surface of the rod support body, defining, with an enclosed inner sidewall of the rod support body, a receiving channel spanning from the receiving aperture into the rod support body, wherein the survey rod is disposed therein and frictionally retained by, and selectively, removably, and directly coupled to, the enclosed inner sidewall of the rod support body. The boot also has at least one cantilever member projecting in a direction outwardly from a sidewall of the rod support body and has a lower surface opposing an upper surface of the at least one cantilever member and defining a body resting plane so a user can obtain a measurement from the survey rod boot.

Abstract: A survey rod boot utilized with a survey rod, wherein the survey rod includes a rod support body defining a receiving aperture disposed on an upper surface of the rod support body, defining, with an enclosed inner sidewall of the rod support body, a receiving channel spanning from the receiving aperture into the rod support body, wherein the survey rod is disposed therein and frictionally retained by, and selectively, removably, and directly coupled to, the enclosed inner sidewall of the rod support body. The boot also has at least one cantilever member projecting in a direction outwardly from a sidewall of the rod support body and has a lower surface opposing an upper surface of the at least one cantilever member and defining a body resting plane so a user can obtain a measurement from the survey rod boot.

Abstract: A digital logic circuit comprises a programmable logic device and a programmable security circuit. The programmable security circuit stores a set of authorized configuration security keys. The programmable security circuit compares the authorized configuration security keys with an incoming configuration request, and selectively enables a new configuration for the programmable logic device in response to the configuration request. In another exemplary embodiment, a programmable security circuit also stores a set of authorized operation security keys. The programmable security circuit compares the authorized operation security keys with an incoming operation request from the programmable logic device, and selectively enables an operation within the programmable logic device in response to the operation request.

Abstract: A digital logic circuit comprises a programmable logic device and a programmable security circuit. The programmable security circuit stores a set of authorized configuration security keys. The programmable security circuit compares the authorized configuration security keys with an incoming configuration request, and selectively enables a new configuration for the programmable logic device in response to the configuration request. In another exemplary embodiment, a programmable security circuit also stores a set of authorized operation security keys. The programmable security circuit compares the authorized operation security keys with an incoming operation request from the programmable logic device, and selectively enables an operation within the programmable logic device in response to the operation request.