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10

EN29F002 / EN29F002N

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

WRITE OPERATION STATUS

DQ7

DATA

Polling

Erase, Chip Erase, Erase Suspend. (See Table 6)

When the Byte Programming is in progress, an attempt to read the device will produce the

complement of the data last written to DQ7. Upon the completion of the Byte Programming, an

attempt to read the device will produce the true data last written to DQ7. For the Byte Programming,

When the embedded Erase is in progress, an attempt to read the device will produce a “0” at the

DQ7 output. Upon the completion of the embedded Erase, the device will produce the “1” at the DQ7

rising edge of the sector erase WE or CE pulse.

used is in a protected sector.

Just prior to the completion of the embedded operations, DQ7 may change asynchronously when the

instant of time and valid data at the next instant of time. Depending on when the system samples the

DQ7 output, it may read the status of valid data. Even if the device has completed the embedded

operations and DQ7 has a valid data, the data output on DQ0-DQ6 may be still invalid. The valid

data on DQ0-DQ7 will be read on the subsequent read attempts.

diagram is shown in Figure 8.

DQ6

Toggle Bit I

The EN29F002 provides a “Toggle Bit” on DQ6 to indicate to the host system the status of the

embedded programming and erase operations. (See Table 6)

During an embedded Program or Erase operation, successive attempts to read data from the device

at any address (by toggling OE or CE ) will result in DQ6 toggling between “zero” and “one”. Once

the embedded Program or Erase operation is complete, DQ6 will stop toggling and valid data will be

read on the next successive attempts. During Byte Programming, the Toggle Bit is valid after the

rising edge of the fourth WE pulse in the four-cycle sequence. For Chip Erase, the Toggle Bit is valid

after the rising edge of the sixth-cycle sequence. For Sector Erase, the Toggle Bit is valid after the

In Byte Programming, if the sector being written to is protected, DQ6 will toggle for about

2

µs, then stop toggling without the data in the sector having changed. In Sector Erase or Chip

Erase, if all selected sectors are protected, DQ6 will toggle for about 100

µs. The chip will then return

to the read mode without changing data in all protected sectors.

Toggling either