A d v a n c e
I n f o r m a t i o n
If DQ5 goes high during a program or erase operation, writing the reset command
returns the device to the read mode (or erase-suspend-read mode if the device
was in Erase Suspend).
Note that if DQ1 goes high during a Write Buffer Programming operation, the sys-
tem must write the Write-to-Buffer-Abort Reset command sequence to reset the
device for the next operation.
Autoselect Command Sequence
The autoselect command sequence allows the host system to read several iden-
tifier codes at specific addresses:
Identifier Code
Manufacturer ID
Device ID, Cycle 1
Device ID, Cycle 2
Device ID, Cycle 3
Secured Silicon Sector Factory Protect
Sector Protect Verify
A7:A0
(x16)
00h
01h
0Eh
0Fh
03h
(SA)02h
A6:A-1
(x8)
00h
02h
1Ch
1Eh
06h
(SA)04h
Note:
The device ID is read over three cycles. SA = Sector Address
The autoselect command sequence is initiated by first writing two unlock cycles.
This is followed by a third write cycle that contains the autoselect command. The
device then enters the autoselect mode. The system may read at any address any
number of times without initiating another autoselect command sequence:
The system must write the reset command to return to the read mode (or erase-
suspend-read mode if the device was previously in Erase Suspend).
Enter Secured Silicon Sector/Exit Secured Silicon
Sector Command Sequence
The Secured Silicon Sector region provides a secured data area containing an 8-
word/16-byte random Electronic Serial Number (ESN). The system can access
the Secured Silicon Sector region by issuing the three-cycle Enter Secured Silicon
Sector command sequence. The device continues to access the Secured Silicon
Sector region until the system issues the four-cycle Exit Secured Silicon Sector
command sequence. The Exit Secured Silicon Sector command sequence returns
the device to normal operation.
and
show the address and data
requirements for both command sequences. See also “Secured Silicon Sector
Flash Memory Region” for further information.
Note that the ACC function and un-
lock bypass modes are not available when the Secured Silicon Sector is enabled.
Word Program Command Sequence
Programming is a four-bus-cycle operation. The program command sequence is
initiated by writing two unlock write cycles, followed by the program set-up com-
mand. The program address and data are written next, which in turn initiate the
Embedded Program algorithm. The system is not required to provide further con-
trols or timings. The device automatically provides internally generated program
pulses and verifies the programmed cell margin.
and
show the
address and data requirements for the word program command sequence,
respectively.
44
S29GLxxxA MirrorBit™ Flash Family
S29GLxxxA_00_A2 January 28, 2005
SPANSION [ SPANSION ]
