JS48F4400P0P3C0 datasheet(89/139 Pages) NUMONYX

89 / 139 page

April 2008

Datasheet

309823-10

Numonyx™ StrataFlash® Cellular Memory (M18)

Note:

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

read mode to Read Status Register mode, thereby allowing programming progress to

be monitored from that partition’s address.

Single-Word Programming is supported in Control mode only. The array address

specified must be in the A-half of the programming region.

During programming, the Status Register indicates a busy status (SR7 = 0). Upon

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

should be checked for any errors, then cleared.

The only valid commands during programming are Read Array, Read Device

Information, CFI Query, Read Status and Program Suspend. After programming has

finished, any valid command can be issued.

Note:

Issuing the Read Array, Read Device Information, or CFI Query command to a partition

that is actively programming causes subsequent reads from that partition to output

invalid data. Valid data is output only after the program operation has finished.

Standby power levels are not realized until the programming operation has finished.

Asserting RST# immediately aborts the programming operation, and array contents at

the addressed location are indeterminate. The addressed block should be erased, and

the data re-programmed.

9.6.2

Buffered Programming

Buffered Programming programs multiple words simultaneously into the flash memory

array. Data is first written to a write buffer and then programmed into the flash

memory array in buffer-size increments. This can significantly reduce the effective

word-write time. Section 6.0, “Flow Charts” on page 41 contains a flow chart of the

buffered-programming operation.

Note:

Optimal performance and power consumption is realized only by aligning the start

address on 32-word boundaries, e.g., A[4:0] = 00000b. Crossing a 32-word boundary

during a Buffered Programming operation can cause the programming time to double.

Buffered Programming is supported in both Control mode and Object mode. In Object

mode, the region must be programmed only once between erases. However in Control

mode, the region may be programmed multiple times.

Caution:

When using the Buffered Program command in Object mode, the start address

must be aligned to the 512-word buffer boundary. In Control mode, the

programming array address specified must be in the A-half of the

programming region.

First issue the Read Status command to the desired partition. The read mode of the

addressed partition is changed to Read Status Register mode.

Poll SR7 to determine write-buffer availability (0 = not available, 1 = available). If the

write buffer is not available, re-issue the Read Status command and check SR7; repeat

until SR7 = 1.

If desired issue a Read Array command to the desired partition to change the read

mode of the partition to Array reads.

To perform a buffered programming operation, issue the Buffered Program setup

command at the desired starting address. Next, issue a word count at the desired

starting address. The word count is the total number of words to be written into the

write buffer, minus one. This value can range from 0000h (one word) up to a maximum

of 01FFh (512 words). Exceeding the allowable range causes the operation to abort.

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