AM29PDL128G70 SPANSION [SPANSION], AM29PDL128G70 Datasheet - Page 38

• Manufacturer Part Number: AM29PDL128G70
• Description: 128 Megabit (8 M x 16-Bit/4 M x 32-Bit) CMOS 3.0 Volt-only, Simultaneous Read/ Write Flash Memory with VersatileIO Control
• Manufacturer: SPANSION [SPANSION]

DQ7, DQ6, DQ2, or RY/BY# in the erasing bank.
Refer to the
mation on these status bits.
Once the sector erase operation has begun, only the
Erase Suspend command is valid. All other com-
mands are ignored. However, note that a hardware
reset immediately terminates the erase operation. If
that occurs, the sector erase command sequence
should be reinitiated once that bank has returned to
reading array data, to ensure data integrity.
Figure 4 illustrates the algorithm for the erase opera-
tion. Refer to the
bles in the AC Characteristics section for parameters,
and
Erase Suspend/Erase Resume
Commands
The Erase Suspend command, B0h, allows the sys-
tem to interrupt a sector erase operation and then read
data from, or program data to, any sector not selected
for erasure. The bank address is required when writing
this command. This command is valid only during the
sector erase operation, including the 80 µs time-out
period during the sector erase command sequence.
The Erase Suspend command is ignored if written dur-
ing the chip erase operation or Embedded Program
algorithm.
When the Erase Suspend command is written during
the sector erase operation, the device requires a max-
imum of 20 µs to suspend the erase operation. How-
ever, when the Erase Suspend command is written
during the sector erase time-out, the device immedi-
ately terminates the time-out period and suspends the
erase operation. Addresses are “don’t-cares” when
writing the Erase suspend command.
After the erase operation has been suspended, the
bank enters the erase-suspend-read mode. The sys-
tem can read data from or program data to any sector
not selected for erasure. (The device “erase sus-
pends” all sectors selected for erasure.) Reading at
any address within erase-suspended sectors pro-
duces status information on DQ7–DQ0. The system
can use DQ7, or DQ6 and DQ2 together, to determine
if a sector is actively erasing or is erase-suspended.
Refer to the
mation on these status bits.
After an erase-suspended program operation is com-
plete, the bank returns to the erase-suspend-read
mode. The system can determine the status of the
program operation using the DQ7 or DQ6 status bits,
just as in the standard Double Word/Word Program
operation. Refer to the
for more information.
July 29, 2002
Figure 18
Write Operation Status
Write Operation Status
section for timing diagrams.
Erase and Program Operations
Write Operation Status
section for infor-
section for infor-
P R E L I M I N A R Y
section
Am29PDL128G
ta-
In the erase-suspend-read mode, the system can also
issue the autoselect command sequence. The device
allows reading autoselect codes even at addresses
within erasing sectors, since the codes are not stored
in the memory array. When the device exits the au-
toselect mode, the device reverts to the Erase Sus-
pend mode, and is ready for another valid operation.
Refer to the
mand Sequence
To resume the sector erase operation, the system
must write the Erase Resume command (address bits
are don’t care). The bank address of the erase-sus-
pended bank is required when writing this command.
Further writes of the Resume command are ignored.
Another Erase Suspend command can be written after
the chip has resumed erasing.
Password Program Command
The Password Program Command permits program-
ming the password that is used as part of the hard-
ware protection scheme. The actual password is
64-bits long. Depending upon the state of the WORD#
pin, multiple Password Program Commands are re-
quired. For a x16 bit data bus, 4 Password Program
commands are required to program the password. For
Notes:
1. See Tables
2. See the section on DQ3 for information on the sector
erase timer.
No
Figure 4. Erase Operation
Command Sequence
Autoselect Mode
Data Poll to Erasing
Erasure Completed
14
Bank from System
Write Erase
and
sections for details.
Data = FFh?
(Notes 1, 2)
START
16
for erase command sequence.
Yes
and
Embedded
Erase
algorithm
in progress
Autoselect Com-
37