JS48F4400P0P3C0 datasheet(110/139 Pages) NUMONYX

110 / 139 page

Numonyx™ StrataFlash® Cellular Memory (M18)

Datasheet

April 2008

110

309823-10

12.0

Common Flash Interface

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

command-set and control-interface descriptions. It describes the database structure

containing the data returned by a read operation after issuing the CFI Query command.

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.

12.1

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 (A/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

(A/DQ7-0) and 00h in the high byte (A/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 can be

assumed to have 00h on the upper byte in this mode.

Table 49: Summary of Query Structure Output as a Function of Device and Mode

Device

Hex

Offset

Hex

Code

ASCII

Device Addresses

00010:

“Q”

00011:

“R”

Table 50: Example of Query Structure Output of x16 Devices (Sheet 1 of 2)

Word Addressing

Byte Addressing

Offset

Hex Code

Value

Offset

Hex Code

Value

AX - A0

A15 - A0

AX - A0

A7 - A0

00010h

0051

“Q”

00010h

0051

“Q”

00011h

0052

“R”

00011h

0052

“R”

00012h

0059

“Y”

00012h

0059

“Y”

00013h

P_IDLO

PrVendor

00013h

P_IDLO

PrVendor

00014h

P_IDHI

ID#

00014h

P_IDLO

ID#

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