Triggered query in chain devices, system, and method

A master device comprising:

• a data communication bus interface configured to be connected to a shared data communication bus;
• a daisy-chain feedback input separate from the data communication bus interface;
• and
• a daisy-chain enable output separate from the data communication bus interface;
• wherein the master device is configured to:
• communicatively couple with a plurality of slave devices over the shared data communication bus;
• communicatively couple with the plurality of slave devices in a daisy-chain configuration via the daisy-chain feedback input and the daisy-chain enable output;
• and
• responsive to a change of the daisy-chain feedback input to an interrupt value, poll the plurality of slave devices for feedback collection using the shared data communication bus, the polling comprising:
• reading a first data ready status from a first polled slave device;
• in response to the first data ready status indicating a first value, reading a first feedback register of the first polled slave device;
• and
• in response to the first data ready status not indicating the first value, skipping a reading of the first feedback register of the first polled slave device.

A slave device comprising:

• a data communication bus interface configured to be connected to a shared data communication bus;
• a daisy-chain input separate from the data communication bus interface;
• a daisy-chain output separate from the data communication bus interface;
• a data status ready register;
• and
• a feedback register;
• wherein the slave device is configured to:
• communicatively couple with a master device over the shared data communication bus;
• communicatively couple with the master device and one or more other slave devices in a daisy-chain configuration via the daisy-chain input and the daisy-chain output;
• and
• in response to a local interrupt event:
• change the daisy-chain output from an operating value to a first interrupt value;
• set a data status ready indicator in the data status ready register to a first value;
• and
• store feedback data in the feedback register.

A communication method in a digital communication system comprising a master device and a plurality of slave devices communicatively coupled with the master device over a shared data communication bus, the master device and the slave devices also coupled together in a daisy-chain configuration separate from the shared data communication bus, a daisy-chain input of a subsequent device being coupled to a daisy-chain output of a previous device in the daisy-chain configuration, the method comprising:

• changing, by an interrupt slave device, its daisy-chain output to an interrupt value in response to a local interrupt event;
• propagating, by each slave device downstream from the interrupt slave device along the daisy-chain configuration, the interrupt value received at its daisy-chain input to its daisy-chain output;
• and
• polling, by the master device, responsive to detecting a change in its daisy-chain input to the interrupt value, the slave devices for feedback collection using the shared data communication bus, the polling comprising:
• reading, by the master device, a first data ready status from a first polled slave device;
• and
• in response to the first data ready status not indicating a first value, skipping reading, by the master device, a first feedback register of the first polled slave device.