128Mb, 256Mb, 512Mb, 1Gb StrataFlash Memory
Read Operations
Read Operations
The following types of data can be read from the device: array data (read array), device
information (read ID), CFI data (read CFI), and device status (read status register).
Upon power-up or return from reset, the device defaults to read array mode. To change
the read mode, the appropriate command must be issued to the device.
The table below shows the command codes used to configure the device for the desired
read mode.
Table 16: READ MODE Command Bus Cycles
Command
READ ARRAY
READ STATUS REGIS-
TER
READ ID
READ CFI
Setup WRITE Cycle
Address Bus
Partition address
Partition address
Partition address
Partition address
Setup WRITE Cycle
Data Bus
00FFh
0070h
0090h
0098h
Confirm WRITE Cycle Confirm WRITE Cycle
Address Bus
Data Bus
–
–
–
–
–
–
–
–
Read Array
Upon power-up or exit from reset, the device defaults to read array mode. Issuing the
READ ARRAY command places the addressed partition in read array mode and can only
be issued to a partition that is not actively programming or erasing. Subsequent reads
output array data from that partition.
The addressed partition remains in read array mode until a different READ command is
issued, a PROGRAM or ERASE operation is performed, or a BLOCK LOCK SETUP com-
mand is issued in that partition, in which case the read mode automatically changes to
read status.
To change a partition that is actively programming or erasing to read array mode, first
issue the SUSPEND command. After the operation has been suspended, issue the READ
ARRAY command to the partition. When the PROGRAM or ERASE operation is subse-
quently resumed, the partition will automatically revert back to read status mode.
The READ ARRAY command functions independently of the voltage level on V
PP
.
Issuing the READ ARRAY command to a partition that is actively programming or eras-
ing causes subsequent reads from that partition to output invalid data. Valid array data
is output only after the PROGRAM or ERASE operation has completed.
Read ID
Issuing the READ ID command places the addressed partition in read ID mode. Subse-
quent reads output device information such as manufacturer code, device identifier
code, block lock status, OTP data, or read configuration register data.
The addressed partition remains in read ID mode until a different READ command is
issued, or a PROGRAM or ERASE operation is performed in that partition, in which case
the read mode automatically changes to read status.
The READ ID command functions independently of the voltage level on V
PP
.
30
PDF: 09005aef8448483a
128_256_512_65nm_g18.pdf - Rev. F 8/11 EN
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