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LHF32KZR
14
4.1 Read Array Command
Upon initial device power-up and after exit from deep
power-down mode, the device defaults to read array
mode. This operation is also initiated by writing the
Read Array command. The device remains enabled
for reads until another command is written. Once the
internal WSM has started a block erase, bank erase,
(multi) word/byte write or block lock-bit configuration,
the device will not recognize the Read Array
command until the WSM completes its operation
unless the WSM is suspended via an Erase Suspend
and (Multi) Word/byte Write Suspend command. The
Read Array command functions independently of the
V PP voltage and RP# must be V IH .
4.2 Read Identifier Codes Command
The identifier code operation is initiated by writing the
Read Identifier Codes command. Following the
command write, read cycles from addresses shown in
Figure 4 retrieve the manufacturer, device, block lock
configuration and block erase status (see Table 5 for
identifier code values). To terminate the operation,
write another valid command. Like the Read Array
command, the Read Identifier Codes command
functions independently of the V PP voltage and RP#
must be V IH . Following the Read Identifier Codes
command, the following information can be read:
Table 5. Identifier Codes
4.3 Read Status Register Command
The status register may be read to determine when a
block erase, bank erase, (multi) word/byte write or
block lock-bit configuration is complete and whether
the operation completed successfully(see Table 14).
It may be read at any time by writing the Read Status
Register command. After writing this command, all
subsequent read operations output data from the
status register until another valid command is written.
The status register contents are latched on the falling
edge of OE# or BE#(Either BE 0 # or BE 1L #, BE 1H #),
whichever occurs. OE# or BE#(Either BE 0 # or BE 1L #,
BE 1H #) must toggle to V IH before further reads to
update the status register latch. The Read Status
Register command functions independently of the
V PP voltage. RP# must be V IH .
The extended status register may be read to
determine multi word/byte write availability(see Table
14.1). The extended status register may be read at
any time by writing the Multi Word/Byte Write
command. After writing this command, all subsequent
read operations output data from the extended status
register, until another valid command is written. Multi
Word/Byte Write command must be re-issued to
update the extended status register latch.
4.4 Clear Status Register Command
Status register bits SR.5, SR.4, SR.3 and SR.1 are
Code
Manufacture Code
Device Code
Address
00000
00001
00002
00003
Data
B0
D0
set to "1"s by the WSM and can only be reset by the
Clear Status Register command. These bits indicate
various failure conditions (see Table 14). By allowing
system software to reset these bits, several
operations (such as cumulatively erasing or locking
X0004
Block Status Code
? Block is Unlocked
? Block is Locked
? Last erase operation
completed successfully
? Last erase operation did
not completed successfully
? Reserved for Future Use
NOTE:
(1)
X0005 (1)
DQ 0 =0
DQ 0 =1
DQ 1 =0
DQ 1 =1
DQ 2-7
multiple blocks or writing several bytes in sequence)
may be performed. The status register may be polled
to determine if an error occurs during the sequence.
To clear the status register, the Clear Status Register
command (50H) is written. It functions independently
of the applied V PP Voltage. RP# must be V IH . This
command is not functional during block erase, bank
erase, (multi) word/byte write block lock-bit
configuration, block erase suspend or (multi)
word/byte write suspend modes.
1. X selects the specific block status code to be
read. See Figure 4 for the device identifier code
memory map.
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