US 11,693,730 B2
Replaceable unit and apparatus to which the replaceable unit is attached
Naoki Inoue, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Feb. 10, 2021, as Appl. No. 17/172,120.
Claims priority of application No. JP2020-025399 (JP), filed on Feb. 18, 2020.
Prior Publication US 2021/0255919 A1, Aug. 19, 2021
Int. Cl. G06F 11/00 (2006.01); G06F 11/10 (2006.01); G03G 21/18 (2006.01); G06F 1/26 (2006.01)
CPC G06F 11/1004 (2013.01) [G03G 21/1878 (2013.01); G06F 1/26 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A replaceable unit to be attached to a main body of an apparatus, the replaceable unit comprising:
a communication unit configured to perform communication with the main body;
a non-volatile memory storing code information indicating whether a configuration of an error detection code applied to data transmitted and received in the communication is a first configuration or a second configuration; and
a volatile memory, wherein
the communication unit is further configured to store, in the volatile memory, the code information stored in the non-volatile memory, execute the communication in accordance with the code information stored in the volatile memory, and, upon receiving data indicating a change command from the main body, update the code information stored in the volatile memory in accordance with the change command,
the first configuration uses an error detection code of a first code length,
the second configuration uses an error detection code of a second code length that is longer than the first code length, and
the first configuration is used for the change command in order to change from the first configuration to the second configuration.