S71PL254 datasheet(77/196 Pages) SPANSION

77 / 196 page

August 12, 2004 S29PL127J_064J_032J_MCP_00_A3

S29PL127J/S29PL064J/S29PL032J for MCP

Advance

I n f o rmatio n

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. 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 all sectors selected for erasing

are protected, DQ6 toggles for approximately 400 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 DQ7: Data# Polling).

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

mately 1 µs 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.

Table 19 shows the outputs for Toggle Bit I on DQ6. Figure 7 shows the toggle bit

algorithm. Figure 19 in “Read Operation Timings” shows the toggle bit timing di-

agrams. Figure 20 shows the differences between DQ2 and DQ6 in graphical

form. See also the DQ2: Toggle Bit II.

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