EN29GL256H EON [Eon Silicon Solution Inc.], EN29GL256H Datasheet - Page 34

• Manufacturer Part Number: EN29GL256H
• Description: 256 Megabit (32768K x 8-bit / 16384K x 16-bit) Flash Memory Page mode Flash Memory, CMOS 3.0 Volt-only
• Manufacturer: EON [Eon Silicon Solution Inc.]

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 9~12.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
9~12. The system must write the reset command to return the device to the autoselect mode.
COMMON FLASH INTERFACE (CFI)
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
Rev. G, Issue Date: 2011/01/17
34
©2004 Eon Silicon Solution, Inc.,
EN29GL256H/L
www.eonssi.com