A29L040A Series
erase operation is complete. If I/O3 is "0", the device will
accept additional sector erase commands. To ensure the
command has been accepted, the system software should
check the status of I/O3 prior to and following each
subsequent sector erase command. If I/O3 is high on the
second status check, the last command might not have been
accepted. Table 5 shows the outputs for I/O3.
START
Read I/O
7
-I/O
0
0
Read I/O
7
-I/O
(Note 1)
No
Toggle Bit
= Toggle ?
Yes
No
I/O5 = 1?
Yes
- I/O
Read I/O
7
0
(Notes 1,2)
Twice
No
Toggle Bit
= Toggle ?
Yes
Program/Erase
Operation Not
Commplete, Write
Reset Command
Program/Erase
Operation
Commplete
Notes :
1. Read toggle bit twice to determine whether or not it is
toggling. See text.
2. Recheck toggle bit because it may stop toggling as I/O
5
changes to "1". See text.
Figure 4. Toggle Bit Algorithm
PRELIMINARY (March, 2005, Version 0.0)
13
AMIC Technology, Corp.
AMICC [ AMIC TECHNOLOGY ]
