MBM29F080A datasheet(17/47 Pages) FUJITSU

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MBM29F080A-55/-70/-90

Write Operation Status

Notes: 1. Performing successive read operations from the erase-suspended sector will cause DQ2 to toggle.

2. Performing successive read operations from any address will cause DQ6 to toggle.

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

“1” at the DQ2 bit. However, successive reads from the erase-suspended sector will cause DQ2 to toggle.

DQ7

Data Polling

The MBM29F080A 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 the complement of the data last written to DQ7. Upon completion of the Embedded Program Algorithm,

an attempt to read the device will produce the true data last written to DQ7. During the Embedded Erase™

Algorithm, an attempt to read the device will produce a “0” at the DQ7 output. Upon completion of the Embedded

Erase Algorithm an attempt to read the device will produce a “1” at the DQ7 output. The flowchart for Data Polling

(DQ7) is shown in Figure 18.

Data polling will also flag the entry into Erase Suspend. DQ7 will switch “0” to “1” at the start of the Erase Suspend

mode. Please note that the address of an erasing sector must be applied in order to observe DQ7 in the Erase

Suspend Mode.

During Program in Erase Suspend, Data polling will perform the same as in regular program execution outside

of the suspend mode.

For chip 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 sector that is within a

protected sector group. Otherwise, the status may not be valid.

Table 7

Hardware Sequence Flags

Status

DQ7

DQ6

DQ5

DQ3

DQ2

In Progress

Embedded Program Algorithm

DQ7

Toggle

Embedded Erase Algorithm

Toggle

Erase

Suspended

Mode

Erase Suspend Read

(Erase Suspended Sector)

1100

Toggle

(Note 1)

Erase Suspend Read

(Non-Erase Suspended Sector)

Data

Erase Suspend Program

(Non-Erase Suspended Sector)

DQ7

Toggle

(Note 2)

(Note 3)

Exceeded

Time Limits

Embedded Program Algorithm

DQ7

Toggle

Embedded Erase Algorithm

Toggle

N/A

Erase

Suspended

Mode

Erase Suspend Program

(Non-Erase Suspended Sector)

DQ7

Toggle

N/A

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