JS28F320J3D-75 datasheet(39/68 Pages) NUMONYX

39 / 68 page

November 2007

Datasheet

308551-05

Numonyx™ Embedded Flash Memory (J3 v. D)

The following sections describe each programming method.

9.3.1

Single-Word/Byte Programming

Array programming is performed by first issuing the Single-Word/Byte Program

command. This is followed by writing the desired data at the desired array address. The

read mode of the device is automatically changed to Read Status Register mode, which

remains in effect until another read-mode command is issued.

During programming, STS and the Status Register indicate a busy status (SR7 = 0).

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

Status Register should be checked for any errors (SR4), then cleared.

Note:

Issuing the Read Array command to the device while it is actively programming causes

subsequent reads from the device to output invalid data. Valid array data is output only

after the program operation has finished.

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

Also, asserting RP# aborts the programming operation, and array contents at the

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

data re-programmed. If a Single-Word/Byte program is attempted when the

corresponding block lock-bit is set, SR1 and SR4 will be set.

9.3.2

Buffered Programming

Buffered programming operations simultaneous program multiple words into the flash

memory array, significantly reducing effective word-write times. User-data is first

written to a write buffer, then programmed into the flash memory array in buffer-size

increments. Appendix , “Flow Charts” 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 (i.e., A[4:0] = 0b00000). Crossing a 32-word boundary

during a buffered programming operation can cause programming time to double.

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

command at the desired starting address. The read mode of the device/addressed

partition is automatically changed to Read Status Register mode.

Polling SR7 determines write-buffer availability (0 = not available, 1 = available). If the

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

SR7 = 1.

Next, issue the word count at the desired starting address. The word count represents

the total number of words to be written into the write buffer, minus one. This value can

range from 00h (one word) to a maximum of 1Fh (32 words). Exceeding the allowable

range causes an abort.

Following the word count, the write buffer is filled with user-data. Subsequent bus-

write cycles provide addresses and data, up to the word count. All user-data addresses

must lie between <starting address> and <starting address + word count>, otherwise

the WSM continues to run as normal but, user may advertently change the content in

unexpected address locations.

Note:

User-data is programmed into the flash array at the address issued when filling the

write buffer.

After all user-data is written into the write buffer, issue the confirm command. If a

command other than the confirm command is issued to the device, a command

sequence error occurs and the operation aborts.

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