EN29F800 Datasheet, PDF (7/38 Pages) List of Unclassifed Manufacturers – 8 Megabit (1024K x 8-bit / 512K x 16-bit) Flash Memory Boot Sector Flash Memory, CMOS 5.0 Volt-only

EN29F800
USER MODE DEFINITIONS
Word / Byte Configuration
The signal set on the BYTE# Pin controls whether the device data I/O pins DQ15-DQ0 operate in the
byte or word configuration. When the Byte# Pin is set at logic ‘1’, then the device is in word
configuration, DQ15-DQ0 are active and are controlled by CE# and OE#.
On the other hand, if the Byte# Pin is set at logic ‘0’, then the device is in byte configuration, and only
data I/O pins DQ0-DQ7 are active and controlled by CE# and OE#. The data I/O pins DQ8-DQ14
are tri-stated, and the DQ15 pin is used as an input for the LSB (A-1) address function.
Standby Mode
The EN29F800 has a CMOS-compatible standby mode, which reduces the current to < 1µA (typical).
It is placed in CMOS-compatible standby when the CE pin is at V_CC ± 0.5. RESET# and BYTE# pin
must also be at CMOS input levels. The device also has a TTL-compatible standby mode, which
reduces the maximum V_CC current to < 1mA. It is placed in TTL-compatible standby when the CE
pin is at V_IH. When in standby modes, the outputs are in a high-impedance state independent of
the OE input.
Read Mode
The device is automatically set to reading array data after device power-up. No commands are required to
retrieve data. The device is also ready to read array data after completing an Embedded Program or
Embedded Erase algorithm.
After the device accepts an Erase Suspend command, the device enters the Erase Suspend mode. The
system can read array data using the standard read timings, except that if it reads at an address within
erase-suspended sectors, the device outputs status data. After completing a programming operation in
the Erase Suspend mode, the system may once again read array data with the same exception. See
“Erase Suspend/Erase Resume Commands” for more additional information.
The system must issue the reset command to re-enable the device for reading array data if DQ5 goes
high, or while in the autoselect mode. See the “Reset Command” additional details.
Output Disable Mode
When the CE or OE pin is at a logic high level (V_IH), the output from the EN29F800 is disabled.
The output pins are placed in a high impedance state.
Auto Select Identification Mode
The autoselect mode provides manufacturer and device identification, and sector protection
verification, through identifier codes output on DQ15–DQ0. This mode is primarily intended for
programming equipment to automatically match a device to be programmed with its corresponding
programming algorithm. However, the autoselect codes can also be accessed in-system through the
command register.
When using programming equipment, the autoselect mode requires V_ID (10.5 V to 11.5 V) on
address pin A9. Address pins A6, A1, and A0 must be as shown in Autoselect Codes (High Voltage
Method) table. In addition, when verifying sector protection, the sector address must appear on the
appropriate highest order address bits. Refer to the corresponding Sector Address Tables. The
Command Definitions table shows the remaining address bits that are don’t-care. When all
necessary bits have been set as required, the programming equipment may then read the
corresponding identifier code on DQ15–DQ0.
4800 Great America Parkway, Suite 202
7
Santa Clara, CA 95054
Rev. E, Issue Date: 2001/07/05
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