9

P/N:PM0579

REV. 1.6, NOV. 21, 2002

MX29F080

SECTOR ERASE COMMANDS

The Automatic Sector Erase does not require the

device to be entirely pre-programmed prior to

executing the Automatic Set-up Sector Erase

command and Automatic Sector Erase command.

Upon executing the Automatic Sector Erase

command, the device will automatically program and

verify the sector(s) memory for an all-zero data

pattern. The system is not required to provide any

control or timing during these operations.

When the sector(s) is automatically verified to

contain an all-zero pattern, a self-timed sector erase

and verify begin.

The erase and verify operations

are complete when the data on Q7 is "1" and the data

on Q6 stops toggling for two consecutive read

cycles, at which time the device returns to the Read

mode. The system is not required to provide any

control or timing during these operations.

When using the Automatic Sector Erase algorithm,

note that the erase automatically terminates when

adequate erase margin has been achieved for the

memory array (no erase verification command is

required). Sector erase is a six-bus cycle operation.

There are two "unlock" write cycles.

These are

followed by writing the set-up command 80H. Two

more "unlock" write cycles are then followed by the

sector erase command 30H. The sector address is

latched on the falling edge of WE or CE, whichever

happens later , while the command (data) is latched

on the rising edge of WE or CE, whichever happens

first. Sector addresses selected are loaded into

internal register on the sixth falling edge of WE or CE,

whichever happens later. Each successive sector

load cycle started by the falling edge of WE or CE,

whichever happens later must begin within 80us from

the rising edge of the preceding WE or CE, whichever

happens first. Otherwise, the loading period ends and

internal auto sector erase cycle starts. (Monitor Q3

to determine if the sector erase timer window is still

open, see section Q3, Sector Erase Timer.) Any

command other than Sector Erase (30H) or Erase

Suspend (B0H) during the time-out period resets the

device to read mode.

Status

Q7

Q6

Q5

Q3

Q2

Byte Program in Auto Program Algorithm

Q7

Toggle

0

0

1

Auto Erase Algorithm

0

Toggle

0

1

Toggle

Erase Suspend Read

1

1

0

0

Toggle

In Progress

(Erase Suspended Sector)

(Note1)

Erase Suspended Mode Erase Suspend Read

Data

Data

Data

Data

Data

(Non-Erase Suspended Sector)

Erase Suspend Program

Q7

Toggle

0

0

1

(Non-Erase Suspended Sector)

(Note2)

(Note3)

Byte Program in Auto Program Algorithm

Q7

Toggle

1

0

1

Exceeded

Program/Erase in Auto Erase Algorithm

0

Toggle

1

1

N/A

Time Limits Erase Suspended Mode Erase Suspend Program

Q7

Toggle

1

0

N/A

(Non-Erase Suspended Sector)

TABLE 4. WRITE OPERATION STATUS

Notes:

1. Performing successive read operations from the erase-suspended sector will cause Q2 to toggle.

2. Performing successive read operations from any address will cause Q6 to toggle.

3. Reading the byte address being programmed while in the erase-suspend program mode will indicate logic "1" at the

Q2 bit.

However, successive reads from the erase-suspended sector will cause Q2 to toggle.