Numonyx™ Wireless Flash Memory (W30)
Appendix B Common Flash Interface
This appendix defines the data structure or database returned by the Common Flash
Interface (CFI) Query command. System software parses this structure to gain critical
information, such as block size, density, x8/x16, and electrical specifications.
Once this information has been obtained, the software can determine which command
sets to use to enable flash device writes, enable block erases, and otherwise control the
flash device. The Query is part of an overall specification for multiple command set and
control interface descriptions, which is called the Common Flash Interface, or CFI.
B.1
Query Structure Output
The Query database allows system software to obtain information for controlling the
flash device. This section describes the flash device CFI-compliant interface that allows
access to Query data.
Query data are presented on the lowest-order data outputs (DQ0-7) only. The
numerical offset value is the address relative to the maximum bus width that the flash
device supports. On the W30 family of flash memory devices, the Query table device
starting address is a 10h, which is a word address for x16 flash devices.
For a word-wide (x16) flash 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 flash device outputs 00h data on upper bytes.
• The flash device outputs ASCII Q in the low byte (DQ0-7) and 00h in the high byte
(DQ8-15).
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, because the upper byte of
word-wide flash devices is always 00h, the leading 00 has been dropped from the table
notation, and only the lower byte value is shown. Any x16 flash device outputs can be
assumed to have 00h on the upper byte in this mode.
Table 32: Summary of Query Structure Output as a Function of the Flash Device and Mode
ASCI
I
Value
Hex
Offset
Hex
Code
Device
00010:
00011:
00012:
51
52
59
Q
R
Y
Device Addresses
November 2007
Order Number: 290702-13
Datasheet
89
NUMONYX [ NUMONYX B.V ]
