S29GL064A90TFIR4 Spansion Inc., S29GL064A90TFIR4 Datasheet - Page 66

• Manufacturer Part Number: S29GL064A90TFIR4
• Manufacturer: Spansion Inc.

Specifications of S29GL064A90TFIR4

• Cell Type: NOR
• Density: 64Mb
• Access Time (max): 90ns
• Interface Type: Parallel
• Boot Type: Bottom
• Address Bus: 23/22Bit
• Operating Supply Voltage (typ): 3/3.3V
• Operating Temp Range: -40C to 85C
• Package Type: TSOP
• Sync/async: Asynchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8/16Bit
• Number Of Words: 8M/4M
• Supply Current: 50mA
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / Rohs Status: Compliant

10.7
66
DQ2: Toggle Bit II
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
Bit I on page 65
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 were 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
outputs for DQ2 and DQ6.
Figure 10.4 on page 66
explains the algorithm. See also
toggle bit timing diagram.
form.
and
DQ2: Toggle Bit II on page 66
shows the toggle bit algorithm in flowchart form, and
Figure 16.10 on page 81
RY/BY#: Ready/Busy# on page
No
Figure 10.4 Toggle Bit Algorithm
for more information.
S29GL-A
Reset Command
Complete, Write
Read DQ7–DQ0
Read DQ7–DQ0
Read DQ7–DQ0
Program/Erase
Operation Not
D a t a
Toggle Bit
Toggle Bit
DQ5 = 1?
= Toggle?
= Toggle?
START
Twice
Yes
Yes
Yes
shows the differences between DQ2 and DQ6 in graphical
S h e e t
Operation Complete
No
No
Program/Erase
64.
Figure 16.9 on page 81
Table 10.2 on page 68
DQ2: Toggle Bit II on page 66
S29GL-A_00_A12 May 21, 2008
shows the
to compare
DQ6: Toggle