JS48F4400P0P3C0 datasheet(81/139 Pages) NUMONYX

81 / 139 page

April 2008

Datasheet

309823-10

Numonyx™ StrataFlash® Cellular Memory (M18)

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.

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.

Table 35: Program Enhanced Configuration Register Command Bus Cycles

Command

Setup Write Cycle

Confirm Write Cycle

Address Bus

Data Bus

Address Bus

Data Bus

Program Enhanced Configuration Register

0060h

0004h

Table 36: Read Mode Command Bus Cycles

Command

Setup Write Cycle

Confirm Write Cycle

Address Bus

Data Bus

Address Bus

Data Bus

Read Array

Partition Address

00FFh

---

Read Status Register

Partition Address

0070h

---

Read Device Information

Partition Address

0090h

---

CFI Query

Partition Address

0098h

---

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