S29AL032D90TFI000 datasheet(44/69 Pages) SPANSION

Part #	S29AL032D90TFI000

Description	32 Megabit CMOS 3.0 Volt-only Flash Memory

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Manufacturer	SPANSION [SPANSION]

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42

S29AL032D

S29AL032D_00_A3 June 13, 2005

Advan ce

In form ati o n

tion. Figure 22, on page 57 shows the toggle bit timing diagram. Figure 23, on page 58 shows

the differences between DQ2 and DQ6 in graphical form.

Reading Toggle Bits DQ6/DQ2

Refer to Figure 7, on page 43 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 tog-

gling, 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 suc-

cessive 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 7, on page

43).

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