S29PL032J SPANSION [SPANSION], S29PL032J Datasheet - Page 79

• Manufacturer Part Number: S29PL032J
• Description: CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory with Enhanced VersatileIO Control
• Manufacturer: SPANSION [SPANSION]

April 7, 2005 31107A62
DQ2: Toggle Bit II
Reading Toggle Bits DQ6/DQ2
Note:
bit may stop toggling as DQ5 changes to “1.” See the
"DQ2: Toggle Bit
The “Toggle Bit II” on DQ2, when used with DQ6, indicates whether a particular
sector is actively erasing (that is, the Embedded Erase algorithm is in progress),
or whether that sector is erase-suspended. Toggle Bit II is valid after the rising
edge of the final WE# pulse in the command sequence.
DQ2 toggles when the system reads at addresses within those sectors that have
been selected for erasure. (The system may use either OE# or CE# (CE1# / CE2#
for PL129J) to control the read cycles.) But DQ2 cannot distinguish whether the
sector is actively erasing or is erase-suspended. DQ6, by comparison, indicates
whether the device is actively erasing, or is in Erase Suspend, but cannot distin-
guish which sectors are selected for erasure. Thus, both status bits are required
for sector and mode information. Refer to
and DQ6.
Figure 7
Bit
Figure 19
between DQ2 and DQ6 in graphical form.
Refer to
gins reading toggle bit status, it must read DQ7–DQ0 at least twice in a row to
II" section explains the algorithm. See also the
The system should recheck the toggle bit even if DQ5 = “1” because the toggle
Figure 7
shows the toggle bit algorithm in flowchart form, and the
shows the toggle bit timing diagram.
II" section for more information.
for the following discussion. Whenever the system initially be-
P R E L I M I N A R Y
S29PL127J/S29PL129J/S29PL064J/S29PL032J
Figure 7. Toggle Bit Algorithm
No
Read Byte Twice
Complete, Write
Reset Command
Program/Erase
Operation Not
Address =VA
Address =VA
Address = VA
(DQ7–DQ0)
(DQ7–DQ0)
(DQ7–DQ0)
Read Byte
Read Byte
Toggle Bit
Toggle Bit
DQ5 = 1?
= Toggle?
= Toggle?
START
Yes
Yes
Yes
Table 23
Operation Complete
No
No
Program/Erase
Figure 20
"DQ6: Toggle Bit
to compare outputs for DQ2
"DQ6: Toggle Bit
shows the differences
I" section and
"DQ2: Toggle
I" section.
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