AM29LV160M datasheet(39/60 Pages) AMD

39 / 60 page

August 11, 2003 25974B0

Am29LV160M

Prelimin ary

change a “0” back to a “1.” Under this condition, the device halts the opera-

tion, and when the operation has exceeded the timing limits, DQ5 produces a “1.”

Under both these conditions, the system must issue the reset command to return

the device to reading array data.

DQ3: Sector Erase Timer

After writing a sector erase command sequence, the system may read DQ3 to de-

termine 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 com-

mand. 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 Sequence” section.

After the sector erase command sequence is written, the system should read the

status on DQ7 (Data# Polling) 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 begun; all further commands (other than Erase Sus-

pend) 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 fol-

lowing each subsequent sector erase command. If DQ3 is high on the second

status check, the last command might not have been accepted. Table 12 shows

the outputs for DQ3.

Table 12. 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

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

Program

Suspend

Mode

Program-

Suspend Read

Program-

Suspended Sector

Invalid (not allowed)

Non-Program

Suspended Sector

Data

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

AM29LV160M Datasheet(PDF) 39 Page - Advanced Micro Devices

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