AM29BDD160G datasheet(54/79 Pages) AMD

54 / 79 page

Am29BDD160G

June 7, 2006

DQ3: Sector Erase Timer

After writing a sector erase command sequence, the

system may read DQ3 to determine whether or not an

erase operation has begun. (The sector erase timer

does not apply to the chip erase command.) If additional

sectors are selected for erasure, the entire time-out also

applies after each additional sector erase command.

When the time-out is complete, DQ3 switches from “0”

to “1.” The system may ignore DQ3 if the system can

guarantee that the time between additional sector

erase commands will always be less than 50 µs. See

also the Sector Erase Command section.

After the sector erase command sequence is written,

the system should read the status on DQ7 (Data# Poll-

ing) or DQ6 (Toggle Bit I) to ensure the device has ac-

cepted the command sequence, and then read DQ3. If

DQ3 is “1”, the internally controlled erase cycle has be-

gun; all further commands (other than Erase Suspend)

are ignored until the erase operation is complete. If

DQ3 is “0”, the device will accept additional sector

erase commands. To ensure the command has been

accepted, the system software should check the status

of DQ3 prior to and following each subsequent sector

erase command. If DQ3 is high on the second status

check, the last command might not have been ac-

cepted. Table 23 shows the outputs for DQ3.

Table 23.

Write Operation Status

Notes:

1. DQ5 switches to ‘1’ when an Embedded Program or Embedded Erase operation has exceeded the maximum timing limits.

See DQ5: Exceeded Timing Limits for more information.

2. DQ7 and DQ2 require a valid address when reading status information. Refer to the appropriate subsection for further details.

Operation

DQ7

(Note 2)

DQ6

DQ5

(Note 1)

DQ3

DQ2

(Note 2)

RY/BY#

Standard

Mode

Embedded Program Algorithm

DQ7#

Toggle

N/A

No toggle

Embedded Erase Algorithm

Toggle

Erase

Suspend

Mode

Reading within Erase

Suspended Sector

No toggle

N/A

Toggle

Reading within Non-Erase

Suspended Sector

Data

Erase-Suspend-Program

DQ7#

Toggle

N/A

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