Logic circuitry

A logic circuitry package for a replaceable print apparatus component, the logic circuitry package comprising:

• logic circuitry that is addressable via a first address and a second, reconfigurable address,
• the second, reconfigurable address being reconfigurable between a default address and at least one different address,
• the logic circuitry including print apparatus component characteristics data and a first key for cryptographic authentication of data being communicated, wherein the first key is related to a second key for cryptographic authentication stored on the print apparatus;
• wherein the logic circuitry package is to:
• participate in a first validation process based on communications sent to the first address by sending a cryptographically authenticated response that includes the characteristics data encrypted using the first key and at least one of a message authentication code or a session key identifier derived from at least one of the first key or the second key;
• and
• participate in a second validation process based on communications sent to the second address by sending validation responses including a bitstream that is not encrypted using the first key and not accompanied by a message authentication code or session key identifier;
• wherein the logic circuitry package is I2C compatible using I2C compatible addresses;
• and
• wherein, in response to a first command indicative of a task and a first time period sent to the first address, the logic circuitry package is accessible via at least one second address for a duration based on the time period.

A print cartridge comprising:

• a logic circuitry package including:
• at least one logic circuit that is addressable via a first address and via a second, reconfigurable address, the second, reconfigurable address being reconfigurable between a default address and at least one different address;
• and
• print apparatus component characteristics data and a first key for cryptographic authentication of data being communicated, the first key related to a second key for cryptographic authentication stored on a print apparatus,
• wherein the logic circuitry package is to:
• participate in a first validation process based on communications sent to the first address by sending a cryptographically authenticated response that includes the characteristics data encrypted using the first key and at least one of a message authentication code or a session key identifier derived from at least one of the first key or the second key, and
• participate in a second validation process based on communications sent to the second address by sending validation responses including a bitstream that is not encrypted using the first key and not accompanied by a message authentication code or session key identifier,
• wherein the logic circuitry package is I2C compatible using I2C compatible addresses,
• wherein, in response to a first command indicative of a task and a first time period sent to the first address, the logic circuitry package is accessible via at least one second address for a duration based on the time period, and
• wherein the logic circuitry package is to provide sensor data in response to a request sent to the second address.