Preliminary EN29GL064
COMMON FLASH INTERFACE (CFI)
The common flash interface (CFI) specification outlines device and host systems software
interrogation handshake, which allows specific vendor-specified software algorithms to be used for
entire families of devices. Software support can then be device-independent, JEDEC ID-independent,
and forward- and backward-compatible for the specified flash device families. Flash vendors can
standardize their existing interfaces for long-term compatibility.
This device enters the CFI Query mode when the system writes the CFI Query command, 98h, to
address 55h in word mode (or address AAh in byte mode), any time the device is ready to read array
data.
The system can read CFI information at the addresses given in Tables 10~13.In word mode, the
upper address bits (A7–MSB) must be all zeros. To terminate reading CFI data, the system must
write the reset command.
The system can also write the CFI query command when the device is in the autoselect mode. The
device enters the CFI query mode and the system can read CFI data at the addresses given in
Tables 10~13. The system must write the reset command to return the device to the autoselect
mode.
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
©2004 Eon Silicon Solution, Inc., www.eonssi.com
41
Rev. A, Issue Date: 2009/3/20
EON [ EON SILICON SOLUTION INC. ]
