S29GL01GS datasheet(39/118 Pages) INFINEON

39 / 118 page

Datasheet

001-98285 Rev. *T

2023-07-17

128 Mb/256 Mb/512 Mb/1 Gb GL-S MIRRORBIT™ Flash

Parallel, 3.0 V

Embedded operations

Figure 7

Data# Polling algorithm

5.5.2.2

DQ6: Toggle Bit I

Toggle Bit I on DQ6 indicates whether an embedded program or erase algorithm is in progress or complete, or

whether the device has entered the Program Suspend or Erase Suspend mode. Toggle Bit I may be read at any

address, and is valid after the rising edge of the final WE# pulse in the command sequence (prior to the program

or erase operation).

During an embedded program or erase algorithm operation, successive read cycles to any address cause DQ6 to

toggle. (The system may use either OE# or CE# to control the read cycles). When the operation is complete, DQ6

stops toggling.

After an erase command sequence is written, if the sector selected for erasing is protected, DQ6 toggles for

approximately 100 µs, then the EAC returns to standby (Read Mode). If the selected sector is not protected, the

embedded erase algorithm erases the unprotected sector.

The system can use DQ6 and DQ2 together to determine whether a sector is actively erasing or erase-suspended.

When the device is actively erasing (that is, the embedded erase algorithm is in progress), DQ6 toggles. When the

device enters the Program Suspend mode or Erase Suspend mode, DQ6 stops toggling. However, the system

must also use DQ2 to determine which sectors are erasing, or erase-suspended. Alternatively, the system can use

DQ7 (see “DQ7: Data# Polling” on page 38).

DQ6 also toggles during the erase-suspend-program mode, and stops toggling once the embedded program

algorithm is complete.

Table 15 shows the outputs for Toggle Bit I on DQ6. Figure 8 shows the toggle bit algorithm in flowchart form,

and the “Reading Toggle Bits DQ6/DQ2” on page 40 explains the algorithm. Figure 8 shows the toggle bit timing

diagrams. Figure 4 shows the differences between DQ2 and DQ6 in graphical form. See also “DQ2: Toggle Bit II”

on page 40.

START

Read DQ7-DQ0

FAIL

DQ7 = Data?

Yes

DQ5 = 1?

Yes

DQ7 = Data?

Yes

PASS

Read DQ 7 -DQ0

Note

21.DQ7 should be rechecked even if DQ5 = 1 because DQ7 may change simultaneously with DQ5.

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