HY29F080 datasheet(13/38 Pages) HYNIX

13 / 38 page

Rev. 6.1/May 01

HY29F080

sector is to be erased. As described later in this

section, multiple sectors can be specified for era-

sure with a single command sequence. During

sector erase, all specified sectors are erased se-

quentially. The data in sectors not specified for

erasure, as well as the data in any sectors speci-

fied for erasure but located within protected sec-

tor groups, is not affected by the sector erase op-

eration.

The Sector Erase command sequence starts the

Automatic Erase algorithm, which preprograms

and verifies the specified unprotected sectors for

an all zero data pattern prior to electrical erase.

The device then provides the required number of

internally generated erase pulses and verifies cell

erasure within the proper cell margins. The host

system is not required to provide any controls or

timings during these operations.

After the sector erase data cycle (the sixth bus

cycle) of the command sequence is issued, a sec-

tor erase time-out of 50 µs (typical), measured from

the rising edge of the final WE# pulse in that bus

cycle, begins. During this time, an additional sec-

tor erase data cycle, specifying the sector address

of another sector to be erased, may be written

into an internal sector erase buffer. This buffer

may be loaded in any sequence, and the number

of sectors specified may be from one sector to all

sectors. The only restriction is that the time be-

tween these additional data cycles must be less

than 50 µs, otherwise erasure may begin before

the last data cycle is accepted. To ensure that all

data cycles are accepted, it is recommended that

host processor interrupts be disabled during the

time that the additional cycles are being issued

and then be re-enabled afterwards.

Note: The device is capable of accepting three ways

of invoking Erase Commands for additional sectors

during the time-out window. The preferred method,

described above, is the sector erase data cycle after

the initial six bus cycle command sequence. How-

ever, the device also accepts the following methods

of specifying additional sectors during the sector

erase time-out:

n Repeat the entire six-cycle command sequence, speci-

fying the additional sector in the sixth cycle.

n Repeat the last three cycles of the six-cycle command

sequence, specifying the additional sector in the third

cycle.

If all sectors scheduled for erasing are within pro-

tected sector groups, the device returns to read-

ing array data after approximately 100 µs. If at

least one selected sector is not protected, the

erase operation erases the unprotected sectors,

and ignores the command for the selected sec-

tors that are protected.

The system can monitor DQ[3] to determine if the

50 µs sector erase time-out has expired, as de-

scribed in the Write Operation Status section. If

the time between additional sector erase data

cycles can be insured to be less than the time-

out, the system need not monitor DQ[3].

Any command other than Sector Erase or Erase

Suspend during the time-out period resets the

device to reading array data. The system must

then rewrite the command sequence, including any

additional sector erase data cycles. Once the

sector erase operation itself has begun, only the

Erase Suspend command is valid. All other com-

mands are ignored.

As for the Chip Erase command, note that a hard-

ware reset immediately terminates the erase op-

eration. To ensure data integrity, the aborted Sec-

tor Erase command sequence should be reissued

once the reset operation is complete.

When the Automatic Erase algorithm terminates,

the device returns to the Read mode. Several

methods are provided to allow the host to deter-

mine the status of the erase operation, as de-

scribed in the Write Operation Status section.

Figure 6 illustrates the Sector Erase procedure.

Erase Suspend/Erase Resume Commands

The Erase Suspend command allows the system

to interrupt a sector erase operation to read data

from, or program data in, any sector not being

erased. The command causes the erase opera-

tion to be suspended in all sectors selected for

erasure. This command is valid only during the

sector erase operation, including during the 50 µs

time-out period at the end of the initial command

sequence and any subsequent sector erase data

cycles, and is ignored if it is issued during chip

erase or programming operations.

The HY29F080 requires a maximum of 15 µs to

suspend the erase operation if the Erase Suspend

command is issued during active sector erasure.

However, if the command is written during the time-

out, the time-out is terminated and the erase op-

eration is suspended immediately. Any sub-

sequent attempts to specify additional sectors for

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