Numonyx™ StrataFlash® Cellular Memory (M18)
Table 35: Program Enhanced Configuration Register Command Bus Cycles
Setup Write Cycle
Confirm Write Cycle
Command
Address Bus
Register Data
Data Bus
Address Bus
Data Bus
Program Enhanced Configuration Register
0060h
Register Data
0004h
To program the Enhanced Configuration Register, the desired settings for ECR[15:0]
are placed on the address bus. The setup command (0060h) is driven on the data bus.
Upon issuing the setup command, the device/addressed partition is automatically
changed to Read Status Register mode.
Next, the Confirm command (0004h) is driven on the data bus. After issuing the
Confirm command, the addressed partition is automatically switched to Read Array
mode.
This command functions independently of the applied VPP voltage.
Note:
Since the desired register value is placed on the address lines, any hardware-
connection offsets between the host’s address outputs and the flash device’s address
inputs must be considered, similar to programming the RCR.
9.4
Read Operations
The following types of data can be read from the device: array data, device
information, CFI data, and device status Upon power-up or return from reset, the
device defaults to Read Array mode. To change the device’s read mode, the appropriate
command must be issued to the device. Table 36, “Read Mode Command Bus Cycles”
shows the command codes used to configure the device for the desired read mode. The
following sections describe each read mode.
Table 36: Read Mode Command Bus Cycles
Setup Write Cycle
Address Bus
Partition Address
Confirm Write Cycle
Address Bus Data Bus
Command
Data Bus
00FFh
Read Array
---
---
---
---
---
---
---
---
Read Status Register
Read Device Information
CFI Query
Partition Address
Partition Address
Partition Address
0070h
0090h
0098h
9.4.1
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. Subsequent
reads output array data. The addressed partition remains in Read Array 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 is automatically changed to Read Status.
To changea partition to Read Array mode while it is programming or erasing, 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 subsequently
resumed, the read state of the partition will not change. To change the read state of
the partition to Status read mode, issue a Read Status command to the partition.
April 2008
309823-10
Datasheet
81
NUMONYX [ NUMONYX B.V ]
