S71PL129JB0BAW9Z0 Spansion Inc., S71PL129JB0BAW9Z0 Datasheet - Page 62

• Manufacturer Part Number: S71PL129JB0BAW9Z0
• Manufacturer: Spansion Inc.

Specifications of S71PL129JB0BAW9Z0

• Lead Free Status / RoHS Status: Compliant

60
DQ2: Toggle Bit II
Reading Toggle Bits DQ6/DQ2
Note: The system should recheck the toggle bit even if DQ5 = “1” because the toggle
bit may stop toggling as DQ5 changes to “1.” See
gle Bit II”
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 CE1# / CE2# 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 distinguish which sectors
are selected for erasure. Thus, both status bits are required for sector and mode
information. See
Figure 7
Bit II”
toggle bit timing diagram.
in graphical form.
Refer to
gins reading toggle bit status, it must read DQ7–DQ0 at least twice in a row to
determine whether a toggle bit is toggling. Typically, the system would note and
explains the algorithm. See also
Figure 7
shows the toggle bit algorithm in flowchart form, and the
for more information.
Table 14
for the following discussion. Whenever the system initially be-
S71PL129JC0/S71PL129JB0/S71PL129JA0
Figure 7. Toggle Bit Algorithm
No
Figure 20
to compare outputs for DQ2 and DQ6.
A d v a n c e
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
shows the differences between DQ2 and DQ6
Yes
Yes
Yes
“DQ6: Toggle Bit
Operation Complete
No
No
I n f o r m a t i o n
Program/Erase
“DQ6: Toggle Bit I”
I.”
Figure 19
and
“DQ2: Toggle
“DQ2: Tog-
shows the
S71PL129Jxx_00_A8 October 28, 2005