MBM29F800BA-55PF 데이터 시트보기 (PDF) - Fujitsu

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MBM29F800BA-55PF

FLASH MEMORY CMOS 8M (1M × 8/512K × 16) BIT

Fujitsu 

MBM29F800TA-55/-70/-90/MBM29F800BA-55/-70/-90

When the Erase Suspend command is written during the Sector Erase operation, the device will take a maximum

of 20 µs to suspend the erase operation. When the device has entered the erase-suspended mode, the RY/BY

output pin and the DQ7 bit will be at logic “1”, and DQ6 will stop toggling. The user must use the address of the

erasing sector for reading DQ6 and DQ7 to determine if the erase operation has been suspended. Further writes

of the Erase Suspend command are ignored.

When the erase operation has been suspended, the device defaults to the erase-suspend-read mode. Reading

data in this mode is the same as reading from the standard read mode except that the data must be read from

sectors that have not been erase-suspended. Successively reading from the erase-suspended sector while the

device is in the erase-suspend-read mode will cause DQ2 to toggle. (See the section on DQ2).

After entering the erase-suspend-read mode, the user can program the device by writing the appropriate

command sequence for Program. This Program mode is known as the erase-suspend-program mode. Again,

programming in this mode is the same as programming in the regular Program mode except that the data must

be programmed to sectors that are not erase-suspended. Successively reading from the erase-suspended sector

while the device is in the erase-suspend-program mode will cause DQ2 to toggle. The end of the erase-suspended

Program operation is detected by the RY/BY output pin, Data polling of DQ7, or by the Toggle Bit I (DQ6) which

is the same as the regular Program operation. Note that DQ7 must be read from the Program address while DQ6

can be read from any address.

To resume the operation of Sector Erase, the Resume command (30H) should be written. Any further writes of

the Resume command at this point will be ignored. Another Erase Suspend command can be written after the

chip has resumed erasing.

Write Operation Status

In

Progress

Exceeded

Time

Limits

Table 8 Hardware Sequence Flags

Status

Embedded Program Algorithm

Embedded Erase Algorithm

DQ7 DQ6 DQ5

DQ7 Toggle 0

0 Toggle 0

Erase

Suspended

Mode

Erase Suspend Read (Erase Suspended

Sector)

Erase Suspend Read (Non-Erase

Suspended Sector)

Erase Suspend Program (Non-Erase

Suspended Sector)

1

1

0

Data Data Data

DQ7

Toggle

(Note 1)

0

Embedded Program Algorithm

Embedded Erase Algorithm

DQ7 Toggle 1

0 Toggle 1

Erase

Suspended

Mode

Erase Suspend Program (Non-Erase

Suspended Sector)

DQ7 Toggle 1

DQ3 DQ2

0

1

1 Toggle

0 Toggle

Data Data

0

1

(Note 2)

0

1

1

N/A

0

N/A

Notes: 1. Performing successive read operations from any address will cause DQ6 to toggle.

2. 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.

3. DQ0 and DQ1 are reserve pins for future use. DQ4 is Fujitsu internal use only.

4. DQ8 to DQ15 are “DON’T CARES” because there is for × 16 mode.

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