28F800C3 datasheet(62/70 Pages) NUMONYX

62 / 70 page

C3 Discrete

Datasheet

March 2008

290645-24

Appendix C Common Flash Interface

This appendix defines the data structure or “database” returned by the Common Flash

Interface (CFI) Query command. System software should parse this structure to gain

critical information such as block size, density, x8/x16, and electrical specifications.

Once this information has been obtained, the software detects which command sets to

use to enable flash writes, block erases, and otherwise control the flash component.

The Query is part of an overall specification for multiple command set and control

interface descriptions called Common Flash Interface, or CFI.

C.1

Query Structure Output

The Query database allows system software to obtain information for controlling the

flash device. This section describes the device’s CFI-compliant interface that allows

access to Query data.

Query data are presented on the lowest-order data outputs (DQ0-DQ7) only. The

numerical offset value is the address relative to the maximum bus width supported by

the device. On this family of devices, the Query table device starting address is a 0x10,

which is a word address for x16 devices.

For a word-wide (x16) device, the first two Query-structure bytes, ASCII “Q” and “R,”

appear on the low byte at word addresses 0x10 and 0x11. This CFI-compliant device

outputs 0x00 data on upper bytes. The device outputs ASCII “Q” in the low byte (DQ0-

DQ7) and 0x00 in the high byte (DQ8-DQ15).

At Query addresses containing two or more bytes of information, the least-significant

data byte is presented at the lower address, and the most-significant data byte is

presented at the higher address.

For tables in this appendix, addresses and data are represented in hexadecimal

notation, so the “h” suffix has been dropped. In addition, since the upper byte of word-

wide devices is always “0x00,” the leading “00” has been dropped from the table

notation and only the lower byte value is shown. Any x16 device outputs can be

assumed to have 0x00 on the upper byte in this mode.

Table 28: Summary of Query Structure Output as a Function of Device and Mode

Device

Hex Offset

Hex Code

ASCII Value

Device Addresses

00010:

"Q"

00011:

"R"

00012:

"Y"

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