S29GL064N90TFI020 Spansion Inc., S29GL064N90TFI020 Datasheet - Page 58

• Manufacturer Part Number: S29GL064N90TFI020
• Description: IC, FLASH, 64MBIT, 90NS, TSOP-56
• Manufacturer: Spansion Inc.

Specifications of S29GL064N90TFI020

• Memory Type: Flash
• Memory Size: 64Mbit
• Ic Interface Type: CFI, Parallel
• Access Time: 90ns
• Supply Voltage Range: 2.7V To 3.6V
• Memory Case Style: TSOP
• No. Of Pins: 56
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.14 DQ2: Toggle Bit II
58
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 the
subsections on DQ6 and DQ2 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 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.
S29GL-N MirrorBit
No
Figure 10.6 Toggle Bit Algorithm
Reset Command
Complete, Write
Read DQ7–DQ0
Read DQ7–DQ0
Read DQ7–DQ0
Program/Erase
Operation Not
Toggle Bit
Toggle Bit
DQ5 = 1?
= Toggle?
= Toggle?
START
D a t a
Twice
®
Flash Family
Yes
Yes
Yes
S h e e t
Operation Complete
No
No
Program/Erase
Table 10.5 on page 60
S29GL-N_01_12 October 29, 2008
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