S71GS128NB0 SPANSION [SPANSION], S71GS128NB0 Datasheet - Page 72

• Manufacturer Part Number: S71GS128NB0
• Description: 128N based MCPs
• Manufacturer: SPANSION [SPANSION]

72
Chip Erase Command Sequence
After the Program Resume command is written, the device reverts to program-
ming. The system can determine the status of the program operation using the
DQ7 or DQ6 status bits, just as in the standard program operation. See Write Op-
eration Status for more information.
The system must write the Program Resume command (address bits are don’t
care) to exit the Program Suspend mode and continue the programming opera-
tion. Further writes of the Resume command are ignored. Another Program
Suspend command can be written after the device has resume programming.
Chip erase is a six bus cycle operation. The chip erase command sequence is ini-
tiated by writing two unlock cycles, followed by a set-up command. Two
additional unlock write cycles are then followed by the chip erase command,
which in turn invokes the Embedded Erase algorithm. The device does not require
the system to preprogram prior to erase. The Embedded Erase algorithm auto-
matically preprograms and verifies the entire memory for an all zero data pattern
prior to electrical erase. The system is not required to provide any controls or tim-
ings during these operations.
for the chip erase command sequence.
When the Embedded Erase algorithm is complete, the device returns to the read
mode and addresses are no longer latched. The system can determine the status
of the erase operation by using DQ7, DQ6, or DQ2. Refer to the Write Operation
Status section for information on these status bits.
No
Figure 3. Program Suspend/Program Resume
Sequence in Progress
Program Operation
Write address/data
Write address/data
Program Suspend
or Write-to-Buffer
Device reverts to
operation prior to
Read data as
Wait 15 µs
XXXh/B0h
XXXh/30h
S29GLxxxN MirrorBit
reading?
required
Done
A d v a n c e
Yes
Table 12
shows the address and data requirements
Write Program Suspend
Command Sequence
Command is also valid for
Erase-suspended-program
operations
Autoselect and SecSi Sector
read operations are also allowed
Data cannot be read from erase- or
program-suspended sectors
Write Program Resume
Command Sequence
TM
Flash Family
I n f o r m a t i o n
S29GLxxxN_MCP_A1 December 15, 2004