NAND08GR3B2C datasheet(39/69 Pages) NUMONYX

39 / 69 page

NAND04G-B2D, NAND08G-BxC

Device operations

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6.15

Read ONFI signature

To recognize NAND Flash devices that are compatible with the ONFI 1.0 command set, the

Read Electronic Signature can be issued, followed by an address of 20h. The next four

bytes output is the ONFI signature, which is the ASCII encoding of the “ONFI” word.

Reading beyond four bytes produces indeterminate values.

Figure 33 provides a description of the read ONFI signature waveform and Table 20

provides the definition of the output bytes.

6.16

Read parameter page

The Read Parameter Page command retrieves the data structure that describes the NAND

Flash organization, features, timings and other behavioral parameters. This data structure

enables the host processor to automatically recognize the NAND Flash configuration of a

device. The whole data structure is repeated at least five times.

See Figure 40 for a description of the read parameter page waveform.

The Random Data Read command can be issued during execution of the read parameter

page to read specific portions of the parameter page.

The Read Status command may be used to check the status of read parameter page during

execution. After completion of the Read Status command, 00h is issued by the host on the

command line to continue with the data output flow for the Read Parameter Page command.

Read status enhanced is not be used during execution of the Read Parameter Page

command.

Table 21 defines the parameter page data structure; for parameters that span multiple bytes,

the least significant byte of the parameter corresponds to the first byte.

Values are reported in the parameter page in bytes when referring to items related to the

size of data access (as in an x8 data access device). For example, the chip returns how

many data bytes are in a page. For a device that supports x16 data access, the host is

required to convert byte values to word values for its use. Unused fields are set to 0h.

For more detailed information about parameter page data bits, refer to ONFI

Specification 1.0, section 5.4.1.

Table 20.

Read ONFI signature

Byte

Value

ASCII character

1st byte

4Fh

2nd byte

4Eh

3rd byte

46h

4th byte

49h

5th byte

Undefined

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