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參數資料
| 型號： | S29GL032A90TAIR20 |
| 廠商： | SPANSION LLC |
| 元件分類： | PROM |
| 英文描述： | 64 MEGABIT 32MEGABIT 3.0 BOLT ONLY PAGE MODE FLASH MEMORY |
| 中文描述： | 2M X 16 FLASH 3V PROM, 90 ns, PDSO56 |
| 封裝： | MO-142EC, TSOP-56 |
| 文件頁數： | 63/95頁 |
| 文件大?。?/td> | 3585K |
| 代理商： | S29GL032A90TAIR20 |
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66
S29GL-A
S29GL-A_00_A12 May 21, 2008
Da ta
Sh e e t
Figure 10.4 Toggle Bit Algorithm
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 DQ6: Toggle
Bit I on page 65 and DQ2: Toggle Bit II on page 66 for more information.
10.7
DQ2: Toggle 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 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 Table 10.2 on page 68 to compare
outputs for DQ2 and DQ6.
Figure 10.4 on page 66 shows the toggle bit algorithm in flowchart form, and DQ2: Toggle Bit II on page 66
explains the algorithm. See also RY/BY#: Ready/Busy# on page 64. Figure 16.9 on page 81 shows the
toggle bit timing diagram. Figure 16.10 on page 81 shows the differences between DQ2 and DQ6 in graphical
form.
START
No
Yes
DQ5 = 1?
No
Yes
Toggle Bit
= Toggle?
No
Program/Erase
Operation Not
Complete, Write
Reset Command
Program/Erase
Operation Complete
Read DQ7–DQ0
Toggle Bit
= Toggle?
Read DQ7–DQ0
Twice
Read DQ7–DQ0
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