15

Write Operation Status

2. Reading the byte address being programmed while in the erase-suspend program mode will indicate logic

Data Polling

The MBM29F040C device features Data Polling as a method to indicate to the host that the Embedded Algorithms

are in progress or completed. During the Embedded Program Algorithm an attempt to read the device will produce

in Figure 15.

For chip erase, and sector erase the Data Polling is valid after the rising edge of the sixth WE pulse in the six

write pulse sequence. For sector erase, the Data Polling is valid after the last rising edge of the sector erase

WE pulse. Data Polling must be performed at sector address within any of the sectors being erased and not a

protected sector. Otherwise, the status may not be valid. Once the Embedded Algorithm operation is close to

the successive read attempts.

The Data Polling feature is only active during the Embedded Programming Algorithm, Embedded Erase

Algorithm, or sector erase time-out. (See Table 6.)

See Figure 9 for the Data Polling timing specifications and diagrams.

Table 6

Hardware Sequence Flags

Status

In Progress

Embedded Program Algorithm

Toggle

0

0

1

Embedded Erase Algorithm

0

Toggle

0

1

Toggle

Erase

Suspended

Mode

Erase Suspend Read

(Erase Suspended Sector)

1100

Toggle

Erase Suspend Read

(Non-Erase Suspended Sector)

Data

Data

Data

Data

Data

Erase Suspend Program

Non-Erase Suspended Sector)

Toggle

(Note 1)

00

1

(Note 2)

Exceeded

Time Limits

Embedded Program Algorithm

Toggle

1

0

1

Program/Erase in Embedded Erase Algorithm

0

Toggle

1

1

N/A

Erase

Suspended

Mode

Erase Suspend Program

(Non-Erase Suspended Sector)

Toggle

1

0

N/A