Data
She et
8.20.2
Write Pulse
Glitch
Protection
Noise pulses of less than 3 ns (typical) on OE#, CE# or WE# do not initiate a write cycle.
8.20.3
Logical Inhibit
Write cycles are inhibited by holding any one of OE# = V
IL
, CE# = V
IH
or WE# = V
IH
. To initiate a write cycle,
CE# and WE# must be a logical zero while OE# is a logical one.
8.20.4
Power-Up Write Inhibit
If WE# = CE# = V
IL
and OE# = V
IH
during power up, the device does not accept commands on the rising
edge of WE#. The internal state machine is automatically reset to the read mode on power-up.
9. 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.
This device enters the CFI Query mode when the system writes the CFI Query command, 98h, to address
55h, any time the device is ready to read array data. The system can read CFI information at the addresses
given in
–
To terminate reading CFI data, the system must write
the reset command.
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
–
The system must write the reset command to return the device
to reading array data.
For further information, please refer to the CFI Specification and CFI Publication 100. Alternatively, contact
your sales representative for copies of these documents.
Table 9.1
CFI Query Identification String
Addresses (x16)
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
Addresses (x8)
20h
22h
24h
26h
28h
2Ah
2Ch
2Eh
30h
32h
34h
Data
0051h
0052h
0059h
0002h
0000h
0040h
0000h
0000h
0000h
0000h
0000h
Description
Query Unique ASCII string “QRY”
Primary OEM Command Set
Address for Primary Extended Table
Alternate OEM Command Set (00h = none exists)
Address for Alternate OEM Extended Table (00h = none
exists)
November 16, 2007 S29GL-N_01_09
S29GL-N MirrorBit
®
Flash Family
37
SPANSION [ SPANSION ]
