In a memory sub-block, a refresh activation instruction signal from a main control circuit is taken in by a de-multiplexer in a local control circuit under a predetermined condition and refreshing is executed in the memory sub-block. The calibration circuit includes a controller to receive and interpret commands in the form of positive and negative pulses for respectively increasing and decreasing Vcom by a predetermined amount per pulse. Additionally, the need for reading old parity to compute new parity is eliminated. Third and fourth projections are point-symmetric around optical axis. A suspended dog amusement system is also disclosed that comprises the above-referenced elements plus a first suspension system comprising a strand-like member, an anchor, and a plurality of pass-through devices for raising and lowering of the apparatus by the dog’s owner. An IDCT block is provided for performing IDCT calculations on each block processed by the dequantization block.