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Memory tag control
The memory tag is a nonvolatile memory built in the print cartridge.
The cartridge usage condition is monitored by reading/writing the data stored in the memory
tag.
The cartridge usage condition is stored in the memory tag as a memory data. The memory
controller reads/writes a memory data into the tag at the specified timing upon receipt of a
command from the DC controller. The DC controller updates a memory data sent from the
memory controller and sends it back to write into the memory tag at a specified timing.
When the following status is received, the DC controller judges a memory tag abnormal and
sends a “cartridge memory abnormality warning” to the formatter.
● Access abnormality: reading/writing failed
● Data abnormality: wrong data is read/written
Figure 5-40.
Memory tag control
Cartridge presence detection
160 Chapter 5 Theory of operation ENWW