JS28F256P33BFE datasheet(61/90 Pages) MICRON

61 / 90 page

Datasheet

Aug 2009

Order Number:320003-08

P33-65nm

Appendix A Supplemental Reference Information

A.1

Common Flash Interface

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 6.2, “Device Command Bus Cycles” on page 18). 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

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 (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 Query table device starting address is a 10h, 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 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 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.

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 have 00h 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

00010:

"Q"

Device Addresses

00011:

"R"

00012:

"Y"

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