COTS PEM
BOOT SECTOR FLASH
Austin Semiconductor, Inc.
AS29LV016J
COMMON FLASH MEMORY INTERFACE
(CFI)
The Common Flash Interface (CFI) specification outlines
device and host system software interrogation handshake,
which allows specific vendor-specified software algorithms
to be used for entire families of devices. Software
support can then be device-independent, JEDEC ID-
independent, and forward- and backward-compatible for
the specified flash device families. Flash vendors can
standardize their existing interfaces for long-term
compatibility.
The system can also write the CFI query command when
the device is in the autoselect mode. The device enters
the CFI query mode, and the system can read CFI data
at the addresses given in Tables 5–8. The system must
write the reset command to return the device to the
autoselect mode.
This device enters the CFI Query mode when the system
writes the CFI Query command, 98h, to address 55h in
word mode (or addressAAh in byte mode), any time the
device is ready to read array data. The system can read
CFI information at the addresses given in Tables 5–8. In
word mode, the upper address bits (A7–MSB) must be
all zeros. To terminate reading CFI data, the system must
write the reset command.
Table 5: CFI Query Identification String
Addresses
Addresses
(Byte Mode)
20h
(Word Mode)
10h
Data
Description
0051h
0052h
0059h
0002h
0000h
0040h
0000h
0000h
0000h
0000h
0000h
Query Unique ASCII String "QRY"
11h
22h
12h
24h
13h
26h
Primary OEM Command Set
14h
28h
15h
2Ah
Address for Primary Extended Table
16h
2Ch
17h
2Eh
Alternate OEM Command Set (00h=none exists)
Address for Alternate OEM Extended Table (00h=none exists)
18h
30h
19h
32h
1Ah
34h
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
AS29LV016J
Rev. 0.0 02/09
14
AUSTIN [ AUSTIN SEMICONDUCTOR ]
