Patent ID: 7815273

Claim:
A fluid ejection device, comprising: two groups of firing cells, sharing a common fire signal and a common address selection mechanism, each firing cell having a drop generator for ejecting fluid and a dynamic memory addressable by the common address selection mechanism; circuitry interfacing to a data line, a data clock, and three select lines carrying three select signals active at separate times; a first of the groups being operable to latch first data to a first subset of firing cells on a first clock active cycle and first select signal, and to latch second data to a second subset of firing cells on a second clock active cycle and second select signal; a second of the groups being operable to receive third data to a third subset of firing cells when the clock is inactive and during the first select signal, and receiving fourth data to a fourth subset of firing cells when the clock is inactive and during the second select signal; and circuitry for receiving the common fire signal during a third select signal and held active for multiple select cycles wherein the dynamic memory is configured to hold the first, second, third, and fourth data through the entire active common fire signal.