AM29BDS320G datasheet(41/74 Pages) SPANSION

41 / 74 page

October 1, 2003 27243B1

Am29BDS320G

Prelimin ary

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 Erase Suspend

mode. Toggle Bit I may be read at any address in the same bank, and is valid

after the rising edge of the final WE# pulse in the command sequence (prior to

the program or erase operation), and during the sector erase time-out.

During an Embedded Program or Erase algorithm operation, successive read cy-

cles to any address cause DQ6 to toggle. When the operation is complete, DQ6

stops toggling.

After an erase command sequence is written, if all sectors selected for erasing

are protected, DQ6 toggles for approximately 100 µs, then returns to reading

array data. If not all selected sectors are protected, the Embedded Erase algo-

rithm erases the unprotected sectors, and ignores the selected sectors that are

protected.

The system can use DQ6 and DQ2 together to determine whether a sector is ac-

tively erasing or is erase-suspended. When the device is actively erasing (that is,

the Embedded Erase algorithm is in progress), DQ6 toggles. When the device en-

ters the Erase Suspend mode, DQ6 stops toggling. However, the system must

also use DQ2 to determine which sectors are erasing or erase-suspended. Alter-

natively, the system can use DQ7 (see the subsection on DQ7: Data# Polling).

If a program address falls within a protected sector, DQ6 toggles for approxi-

mately 1 ms after the program command sequence is written, then returns to

reading array data.

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

once the Embedded Program algorithm is complete.

See the following for additional information: Figure 4 (toggle bit flowchart), DQ6:

Tog g le

Bit

(de scrip tio n),

Figu re 28 ,

“ To gg l e

Bit

Timin gs

(During Embedded Algorithm),” on page 64 (toggle bit timing diagram), and

Table 15, “DQ6 and DQ2 Indications,” on page 41.

AM29BDS320G Datasheet(PDF) 41 Page - SPANSION