EN29F002 datasheet(7/32 Pages) ETC

7 / 32 page

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EN29F002 / EN29F002N

Rev. C, Issue Date: 2001/07/05

Device Code can be read as 7F, 92 (hex) for EN29F002T or as 7F, 97 (hex) for EN29F002B (See

Table 4). All identifiers for manufacturer and device codes possess odd parity with the DQ7 defined

as the parity bit.

Write Mode

Write is used for device programming and erase through the command register. This mode is

selected with CE = WE = L and OE = H. The contents of the command register are the inputs to

the internal state machine. The command register is a set of latches used to store the commands

along with the addresses and data information needed to execute that command. Address latching

occurs on the falling edge of WE or CE (whichever occurs later) and data latching occurs on the

rising edge of WE or CE (whichever occurs first).

Temporary Sector Unprotect Mode

EN29F002 allows protected sectors to be temporarily unprotected for making changes to data stored

in a protected sector in system (n/a for EN29F002N). To activate the temporary sector unprotect, the

RESET pin must be set to a high voltage of VID (11V). In this mode, protected sectors can be

programmed or erased by selecting the sector addresses. Once the high voltage, VID, is removed

from RESET pin, all previously protected sectors will revert to their protected state.

RESET

Hardware Reset Mode (not available on EN29F002N)

Resetting the EN29F002 device is performed when the RESET pin is set to VIL and kept low for at

least 500ns.

The internal state machine will be reset to the read mode.

Any program/erase

operation in progress during hardware reset will be terminated and data may be corrupted.

If the RESET pin is tied to the system reset command, the device will be automatically reset to the

read mode and enable the system’s microprocessor to read the boot-up firmware from the FLASH

memory.

COMMAND DEFINITIONS

The operations of the EN29F002 are selected by one or more commands written into the command

Chip Erase, Erase Suspend and Erase Resume. Commands are made up of data sequences

written at specific addresses via the command register. The sequences for the specified operation

are defined in the Command Table (Table 5).

Incorrect addresses, incorrect data values or

improper sequences will reset the device to the read mode.

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