S71PL129JC0 datasheet(62/153 Pages) SPANSION

62 / 153 page

S71PL129JC0/S71PL129JB0/S71PL129JA0

S71PL129Jxx_00_A8 October 28, 2005

Advance

Info rmation

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 have

been selected for erasure. (The system may use either OE# or CE1# / CE2# 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. See Table 14 to compare outputs for DQ2 and DQ6.

Figure 7 shows the toggle bit algorithm in flowchart form, and the “DQ2: Toggle

Bit II” explains the algorithm. See also “DQ6: Toggle Bit I.” Figure 19 shows the

toggle bit timing diagram. Figure 20 shows the differences between DQ2 and DQ6

in graphical form.

Reading Toggle Bits DQ6/DQ2

Refer to Figure 7 for the following discussion. Whenever the system initially be-

gins 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

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” and “DQ2: Tog-

gle Bit II” for more information.

Figure 7. Toggle Bit Algorithm

START

Yes

DQ5 = 1?

Yes

Toggle Bit

= Toggle?

Program/Erase

Operation Not

Complete, Write

Reset Command

Program/Erase

Operation Complete

Toggle Bit

= Toggle?

Read Byte Twice

(DQ7–DQ0)

Address = VA

Read Byte

(DQ7–DQ0)

Address =VA

Read Byte

(DQ7–DQ0)

Address =VA

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