JS28F256P30B95A datasheet(70/97 Pages) MICRON

70 / 97 page

P30

Datasheet

August 2008

306666-12

Appendix A Supplemental Reference Information

A.1

Common Flash Interface Tables

The Common Flash Interface (CFI) is part of an overall specification for multiple

command-set and control-interface descriptions. This appendix describes the database

structure containing the data returned by a read operation after issuing the Read CFI

command (see Section 6.0, “Command Set” on page 24). System software can parse

this database structure to obtain information about the flash device, such as block size,

density, bus width, and electrical specifications. The system software will then know

which command set(s) to use to properly perform flash writes, block erases, reads and

otherwise control the flash device.

A.1.1

CFI Structure Output

The CFI 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

CFI data.

CFI data are presented on the lowest-order data outputs (DQ7-0) only. The numerical

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

On this family of devices, the CFI table device starting address is a 10h, which is a word

address for x16 devices.

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

appear on the low byte at word addresses 10h and 11h. This CFI-compliant device

outputs 00h data on upper bytes. The device outputs ASCII “Q” in the low byte (DQ7-0)

and 00h in the high byte (DQ15-8).

At CFI 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.

In all of the following tables, 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 “00h,” 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 00h on the upper byte in this mode.

Table 37: Summary of CFI Structure Output as a Function of Device and Mode

Device

Hex

Offset

Hex

Code

ASCII

Value

00010:

"Q"

Device Addresses

00011:

"R"

00012:

"Y"

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