JS48F4400P0P3C0 datasheet(92/139 Pages) NUMONYX

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Numonyx™ StrataFlash® Cellular Memory (M18)

Datasheet

April 2008

309823-10

The Status Register should be polled for SR0 = 0 (Buffer Ready for Data) to determine

when the array programming has completed, and the write buffer is again available for

loading. The internal address is automatically incremented to enable subsequent array

programming to continue from where the previous buffer-fill/array-program sequence

ended within the block. This cycle can be repeated to program the entire block.

To exit the Program/Verify Phase, write FFFFh to an address outside of the block.

9.6.3.3

Exit Phase

The Status Register should be polled for SR7 = 1 (Device Ready) indicating the BEFP

algorithm has finished running, and the device has returned to normal operation. A full

error check should be performed to ensure the block was programmed successfully.

9.7

Block Erase Operations

Erasing a block changes ‘zeros’ to ‘ones’. To change ones to zeros, a program operation

must be performed (see Section 9.6, “Programming Operations). Erasing is performed

on a block basis— an entire block is erased each time an erase command sequence is

issued. Once a block is fully erased, all addressable locations within that block read as

logical ‘ones’ (FFFFh).

Only one block-erase operation can occur at a time. A block-erase operation is not

permitted during Program Suspend.

To perform a block-erase operation, issue the Block Erase command sequence at the

desired block address. Table 41 shows the two-cycle Block Erase command sequence.

Caution:

All block-erase operations require the addressed block to be unlocked, and a

valid voltage applied to VPP throughout the block-erase operation. Otherwise,

the operation aborts, setting the appropriate Status Register error bit(s).

The Erase Confirm command latches the address of the block to be erased. The

addressed block is preconditioned (programmed to all zeros), erased, and then verified.

The read mode of the addressed partition is automatically changed to Read Status

Note:

Issuing the Read Status Register command to another partition switches that partition’s

read mode to the Read Status Register, thereby allowing block-erase progress to be

monitored from that partition’s address. SR0 indicates whether the addressed partition

or other partition is erasing.

During a block-erase operation, the Status Register indicates a busy status (SR7 = 0).

Upon completion, the Status Register indicates a ready status (SR7 = 1). The Status

The only valid commands during a block erase operation are Read Array, Read Device

Information, CFI Query, Read Status and Erase Suspend. After the block-erase

operation has completed, any valid command can be issued.

Table 41: Block-Erase Command Bus Cycles

Command

Setup Write Cycle

Confirm Write Cycle

Address Bus

Data Bus

Address Bus

Data Bus

Block Erase

Device Address

0020h

Block Address

00D0h

JS48F4400P0P3C0 Datasheet(PDF) 92 Page - Numonyx B.V

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