A jitter measurement circuit includes: a conversion section sampling one of a reference signal and a measurement target signal in response to the other of the signals, thereby obtaining a sampling data string; and a determination section measuring jitter of the measurement target signal on the basis of the sampling data string obtained by the conversion section. For first and second data channels received during at least successive first and second transmission periods, the first and second acknowledgement information is provided. Each provider is associated with a resource and acts as the manager for the resource when interfacing with the resource manager. The seeding implement further includes a depth adjustment assembly including a slot within the packer support structure, a corresponding slot within the packer arm, and a fastener disposed through the slots.