參數(shù)資料
型號(hào)： S29AL016D70BAI022
廠商： SPANSION LLC
元件分類： PROM
英文描述： 1M X 16 FLASH 3V PROM, 70 ns, PBGA48
封裝： 8.15 X 6.15 MM, FBGA-48
文件頁(yè)數(shù)： 28/55頁(yè)
文件大小： 1809K
代理商： S29AL016D70BAI022
34
S29AL016D
S29AL016D_00_A7 November 27, 2007
Da ta
Sh e e t
11.5
Reading Toggle Bits DQ6/DQ2
Refer to Figure 11.2 on page 34 for the following discussion. Whenever the system initially begins 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 store the value of the toggle bit after the first read. After the second
read, the system would compare the new value of the toggle bit with the first. If the toggle bit is not toggling,
the device has completed the program or erase operation. The system can read array data on DQ7–DQ0 on
the following read cycle.
However, if after the initial two read cycles, the system determines that the toggle bit is still toggling, the
system also should note whether the value of DQ5 is high (see the section on DQ5). If it is, the system should
then determine again whether the toggle bit is toggling, since the toggle bit may have stopped toggling just as
DQ5 went high. If the toggle bit is no longer toggling, the device has successfully completed the program or
erase operation. If it is still toggling, the device did not complete the operation successfully, and the system
must write the reset command to return to reading array data.
The remaining scenario is that the system initially determines that the toggle bit is toggling and DQ5 has not
gone high. The system may continue to monitor the toggle bit and DQ5 through successive read cycles,
determining the status as described in the previous paragraph. Alternatively, it may choose to perform other
system tasks. In this case, the system must start at the beginning of the algorithm when it returns to
determine the status of the operation (top of Figure 11.2 on page 34).
Figure 11.2 Toggle Bit Algorithm
Notes
1. Read toggle bit twice to determine whether or not it is toggling. See text.
2. Recheck toggle bit because it may stop toggling as DQ5 changes to 1. See text.
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
(Note 1)
(Notes 1, 2)
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