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:
A7:A0
(x16)
A6:A-1
(x8)
Identifier Code
Manufacturer ID
Device ID, Cycle 1
00h
01h
00h
02h
Device ID, Cycle 2
0Eh
1Ch
Device ID, Cycle 3
0Fh
1Eh
Secured Silicon Sector Factory Protect
Sector Protect Verify
03h
06h
(SA)02h
(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 random Electronic Serial Number (ESN). The system can access the Se-
cured 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. Table 22 shows the address and data require-
ments for both command sequences. See also “Secured Silicon Sector Flash
Memory Region” for further information. Note that the ACC function and unlock
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. Table 22 shows the address and
data requirements for the word program command sequence, respectively.
March 31, 2005 S71GL032A_00_A0
S71GL032A Based MCPs
45
SPANSION [ SPANSION ]
