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LHF08CTE
12
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, byte write or
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 or Byte Write Suspend command.
The Read Array command functions independently of
the V PP voltage and RP# can be V IH or V HH .
4.3 Read Status Register Command
The status register may be read to determine when a
block erase, byte write, or lock-bit configuration is
complete and whether the operation completed
successfully. 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 CE#, whichever
occurs. OE# or CE# 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# can be V IH or V HH .
4.2 Read Identifier Codes Command
4.4 Clear Status Register 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 master lock configuration codes
(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# can be V IH or V HH . Following the Read
Identifier Codes command, the following information
can be read:
Status register bits SR.5, SR.4, SR.3, and SR.1 are
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 7). By allowing
system software to reset these bits, several
operations (such as cumulatively erasing or locking
multiple blocks or writing several bytes in sequence)
may be performed. The status register may be polled
to determine if an error occurre during the sequence.
To clear the status register, the Clear Status Register
command (50H) is written. It functions independently
Table 5. Identifier Codes
Code Address
Data
of the applied V PP Voltage. RP# can be V IH or V HH .
This command is not functional during block erase or
Manufacture Code
00000
89
byte write suspend modes.
Device Code
Block Lock Configuration
00001
X0002 (1)
A6
4.5 Block Erase Command
? Block is Unlocked
? Block is Locked
? Reserved for Future Use
Master Lock Configuration
? Device is Unlocked
? Device is Locked
? Reserved for Future Use
00003
DQ 0 =0
DQ 0 =1
DQ 1-7
DQ 0 =0
DQ 0 =1
DQ 1-7
Erase is executed one block at a time and initiated by
a two-cycle command. A block erase setup is first
written, followed by an block erase confirm. This
command sequence requires appropriate sequencing
and an address within the block to be erased (erase
changes all block data to FFH). Block
preconditioning, erase, and verify are handled
NOTE:
1. X selects the specific block lock configuration
code to be read. See Figure 4 for the device
identifier code memory map.
internally by the WSM (invisible to the system). After
the two-cycle block erase sequence is written, the
device automatically outputs status register data
when read (see Figure 5). The CPU can detect block
erase completion by analyzing the output data of the
RY/BY# pin or status register bit SR.7.
Rev. 1.3
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