HY29LV400 Hynix Semiconductor, HY29LV400 Datasheet - Page 14

• Manufacturer Part Number: HY29LV400
• Description: 4 Mbit (512K x 8/256K x 16) Low Voltage Flash Memory
• Manufacturer: Hynix Semiconductor

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HY29LV400
tomatic Erase algorithm that automatically
preprograms and verifies the entire memory for
an all zero data pattern prior to electrical erase.
The host system is not required to provide any
controls or timings during these operations.
Commands written to the device during execution
of the Automatic Erase algorithm are ignored. Note
that a hardware reset immediately terminates the
chip erase operation. To ensure data integrity, the
aborted Chip Erase command sequence should
be reissued once the reset operation is complete.
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Issue NORMAL PROGRAM
(See Write Operation Status
CHIP ERASE COMPLETE
C o m m a n d S e q u e n c e
Issue CHIP ERASE
Figure 5. Chip Erase Procedure
Check Erase Status
C o m m a n d
Section)
START
Normal Exit
Figure 4. Normal and Unlock Bypass Programming Procedures
N O
N O
DQ[5] Error Exit
Setup Next Address/Data for
Issue UNLOCK BYPASS
Issue UNLOCK BYPASS
P R O G R A M C o m m a n d
ERROR RECOVERY
Program Operation
Unlock Bypass
Programming?
Enable Fast
C o m m a n d
S T A R T
Mode?
GO TO
Y E S
Y E S
When the Automatic Erase algorithm is complete,
the device returns to the array Read mode. Sev-
eral methods are provided to allow the host to
determine the status of the erase operation, as
described in the Write Operation Status section.
Figure 5 illustrates the chip erase procedure.
Sector Erase Command
The Sector Erase command sequence consists
of two unlock cycles, followed by the Erase com-
mand, two additional unlock cycles and then the
sector erase data cycle, which specifies the sec-
tor to be erased. As described later in this sec-
tion, multiple sectors can be specified for erasure
with a single command sequence. During sector
erase, all specified sectors are erased sequen-
tially. The data in sectors not specified for era-
sure, as well as the data in any protected sectors,
even if specified for erasure, is not affected by the
sector erase operation.
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
N O
N O
(See Write Operation Status
Check Programming Status
Issue UNLOCK BYPASS
R E S E T C o m m a n d
PROGRAMMING
Last Word/Byte
Unlock Bypass
C O M P L E T E
Section)
Mode?
Done?
Y E S
Programming Verified
Y E S
DQ[5] Error Exit
R E C O V E R Y P R O C E D U R E
GO TO ERROR
Rev. 1.0/Nov. 01