EN29F080(2000) 查看數據表（PDF） - Eon Silicon Solution Inc.
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EN29F080 Datasheet PDF : 37 Pages
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USER MODE DEFINITIONS
Standby Mode
EN29F080
The EN29F080 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 VCC ± 0.5. The device also has a
TTL-compatible standby mode, which reduces the maximum VCC current to < 1mA. It is placed in
TTL-compatible standby when the CE pin is at VIH. 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 OE pin is at a logic high level (VIH), the output from the EN29F080 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 DQ7–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 VID (11.5 V to 12.5 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 DQ7–DQ0.
To access the autoselect codes in-system; the host system can issue the autoselect command via
the command register, as shown in the Command Definitions table. This method does not require
VID. See “Command Definitions” for details on using the autoselect mode.
Write Mode
Programming is a four-bus-cycle operation. The program command sequence is initiated by writing two
unlock write cycles, followed by the program set-up command. The program address and data are written
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