JS48F4400P0P3C0 datasheet(83/139 Pages) NUMONYX

83 / 139 page

April 2008

Datasheet

309823-10

Numonyx™ StrataFlash® Cellular Memory (M18)

9.4.4

CFI Query

Issuing the CFI Query command places the addressed partition in CFI Query mode.

Subsequent reads from that partition output CFI information.

The addressed partition remains in CFI Query mode until a different read command is

issued, or a program or erase operation is performed, which changes the read mode to

Read Status Register mode.

Note:

Issuing the CFI Query command to a partition that is actively programming or erasing

changes that partition’s read mode to CFI Query mode. Subsequent reads from that

partition will return invalid data until the program or erase operation has completed.

The CFI Query command functions independent of the voltage level on VPP.

9.5

Programming Modes

To understand programming modes, it is also important to understand the fundamental

memory array configuration. The flash device main array is divided as follows:

• The main array of the 128-Mbit device is divided into eight 16-Mbit partitions. Each

parition is divided into eight 256-KByte blocks: 8 x 8 = 64 blocks in the main array

of a 128-Mbit device.

• The main array of the 256-Mbit device is divided into eight 32-Mbit partitions. Each

partition is divided into sixteen 256-KByte blocks: 8 x 16 = 128 blocks in the main

array of a 256-Mbit device.

• The main array of the 512-Mbit device is divided into eight 64-Mbit partitions. Each

partition is divided into thirty-two 256-KByte blocks: 8 x 32 = 256 blocks in the

main array of a 256-Mbit device.

• The main array of the 1-Gbit device is divided into eight 128-Mbit partitions. Each

partition is divided into sixty-four 256-KByte blocks: 8 x 64 = 512 blocks in the

main array of a 1-Gbit device.

Each block is divided into as many as two-hundred-fifty-six 1-KByte programming

regions. Each region is divided into as many as thirty-two 32-Byte segments.

Each programming region in a flash block can be configured for one of two

programming modes: Control Mode or Object Mode. The programming mode is

automatically set based on the data pattern when a region is first programmed. The

selection of either Control Mode or Object Mode is done according to the specific needs

of the system with consideration given to two types of information:

• Control Mode: Flash File System (FFS) or Header information, including frequently

changing code or data

• Object Mode: Large, infrequently changing code or data, such as objects or

payloads

By implementing the appropriate programming mode, software can efficiently organize

how information is stored in the flash memory array.

Control Mode programming regions and Object Mode programming regions can be

intermingled within the same erase block. However, the programming mode of any

region within a block can be changed only after erasing the entire block.

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