S71PL064JB0BFW0B0 Spansion Inc., S71PL064JB0BFW0B0 Datasheet - Page 78

• Manufacturer Part Number: S71PL064JB0BFW0B0
• Manufacturer: Spansion Inc.

Specifications of S71PL064JB0BFW0B0

• Operating Supply Voltage (max): 3.1V
• Operating Temperature (max): 85C
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

79
DQ2: Toggle Bit II
Reading Toggle Bits DQ6/DQ2
Note:
bit may stop toggling as DQ5 changes to “1.” See the DQ6: Toggle Bit I and DQ2:
Toggle Bit II for more information.
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# 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.
Refer to Table
Figure 7
Bit II explains the algorithm. See also the DQ6: Toggle Bit I.
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
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 DQ2: Toggle
19
to compare outputs for DQ2 and DQ6.
for the following discussion. Whenever the system initially be-
S29PL127J/S29PL064J/S29PL032J for MCP
Figure 7. Toggle Bit Algorithm
No
Figure 20
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
P r e l i m i n a r y
Yes
Yes
Yes
Operation Complete
No
No
Program/Erase
Figure 19
S29PL127_064_032J_00_A1 May 21, 2004
shows the