A29L320 AMICC [AMIC Technology], A29L320 Datasheet - Page 24

• Manufacturer Part Number: A29L320
• Description: 4M X 8 Bit / 2M X 16 Bit CMOS 3.3 Volt-only, Boot Sector Flash Memory
• Manufacturer: AMICC [AMIC Technology]

The I/O
program a "1 "to a location that is previously programmed to
"0." Only an erase operation can change a "0" back to a "1."
Under this condition, the device halts the operation, and
when the operation has exceeded the timing limits, I/O
produces a "1."
Under both these conditions, the system must issue the reset
command to return the device to reading array data.
I/O
After writing a sector erase command sequence, the system
may read I/O
operation has begun. (The sector erase timer does not apply
to the chip erase command.) If additional sectors are
selected for erasure, the entire time-out also applies after
each additional sector erase command. When the time-out is
complete, I/O
ignore I/O
between additional sector erase commands will always be
less than 50µs. See also the "Sector Erase Command
Sequence" section.
After the sector erase command sequence is written, the
system should read the status on I/O
(Toggle Bit 1) to ensure the device has accepted the
command sequence, and then read I/O
internally controlled erase cycle has begun; all further
commands (other than Erase Suspend) are ignored until the
erase operation is complete. If I/O
accept additional sector erase commands. To ensure the
command has been accepted, the system software should
check the status of I/O
subsequent sector erase command. If I/O
second status check, the last command might not have been
accepted. Table 10 shows the outputs for I/O
PRELIMINARY
3
: Sector Erase Timer
5
failure condition may appear if the system tries to
3
if the system can guarantee that the time
3
3
switches from "0" to "1." The system may
to determine whether or not an erase
(September, 2005, Version 0.0)
3
prior to and following each
3
7
is "0", the device will
(
Data
3
. If I/O
3
3
.
is high on the
Polling) or I/O
3
is "1", the
6
5
23
Notes :
1. Read toggle bit twice to determine whether or not it is
2. Recheck toggle bit because it may stop toggling as I/O
toggling. See text.
changes to "1". See text.
No
Figure 6. Toggle Bit Algorithm
Commplete, Write
Reset Command
Read I/O
Program/Erase
Read I/O
Read I/O
Operation Not
= Toggle ?
= Toggle ?
Toggle Bit
Toggle Bit
I/O
START
AMIC Technology, Corp.
Twice
5
= 1?
7
7
7
Yes
Yes
Yes
-I/O
-I/O
- I/O
0
0
A29L320 Series
0
(Note 1)
(Notes 1,2)
Operation Complete
No
No
Program/Erase
5