HY29F040AR-12 datasheet(10/40 Pages) HYNIX

Part #	HY29F040AR-12

Description	512K x 8-bit CMOS 5.0 volt-only, Sector Erase Flash Memory

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Manufacturer	HYNIX [Hynix Semiconductor]

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HY29F040A

During Sector Erase operation, data bit DQ7 shows

a logical “0”. This operation is known as

/Data Polling. Sector Erase operation is complete

when data on DQ7 is a logical “1” (see Write Opera-

tion Status section) at which time the

device returns to read mode. At this time, the

address pins are no longer latched. Note that

/Data Polling must be performed at a sector

address within any of the sectors being erased and

not a protected sector to ensure that DQ7 returns

a logical “1” upon completion of the Sector Erase

operation.

Figure 2 illustrates the Sector Erase Algorithm us-

ing typical command strings and bus operations.

During execution of the Sector Erase command, only

the Erase Suspend and Erase Resume com-

mands are allowed. All other commands will reset

the device to read mode. Note:

Do not attempt to

write an invalid command sequence during the

sector erase operation. Doing so will terminate the

sector erase operation and the device will reset to

the read mode.

Erase Suspend/Erase Resume

Commands

The Erase Suspend command allows the user to

interrupt a Sector Erase operation and read data

from or program to a sector that is not being erased.

The Erase Suspend command onthe HY29F040 also

allows for Byte Programming during the suspended

erase from a sector not being erased. The Erase

Suspend command is applicable only during Sector

Erase operation and will be ignored if written during

the Chip Erase operation or Byte Programming op-

eration. The Erase Suspend command (B0H) will

be allowed only during the Sector Erase opera-

tion, including, but not limited to, the sector erase

time-out period after any Sector Erase commands

(30H) have been initiated.

Writing the Erase Suspend command during the

time-out will result in immediate termination of the

time-out period. Any subsequent writes of the Sec-

tor Erase command will be taken as the Erase

Resume command (30H). Note that any other com-

mands during the time-out will reset the

device to the read mode. The address pins are

don’t-cares when writing the Erase Suspend or

Erase Resume commands.

When the Erase Suspend command is written dur-

ing a Sector Erase operation, the chip will take a

maximum of 15 ms to suspend the erase opera-

tion and go into erase suspended-read mode.

During this time, the system can monitor the /Data

Polling or Toggle Bit write operation status flags to

determine when the device has entered erase sus-

pend-read mode (see Write Operation Status sec-

tion). The system must use an address of an eras-

ing sector to monitor /Data Polling or Toggle Bit to

determine if the Sector Erase operation has been

suspended.

In the erase suspend-read mode, the system can

read data from any sector that is not being erased.

A read from a sector being erased may result in

invalid data.

After the system writes the Erase Suspend com-

mand and waits until the Toggle Bit stops toggling,

data reads from the device may then be performed.

Any further writes of the Erase Suspend command

at this time will be ignored.

To resume operation of Sector Erase, the Erase

Resume command (30H) should be written. Any

further writes of the Erase Resume command at

this point will be ignored. Another Erase Suspend

command can be written after the chip has re-

sumed the Sector Erase operation.

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