9

P/N:PM0590

REV. 1.4, NOV. 21, 2002

MX29F016

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, while the

command(data) is latched on the rising edge of WE.

Sector addresses selected are loaded into internal

register on the sixth falling edge of WE.

Each

successive sector load cycle started by the falling

edge of WE must begin within 80ms from the rising

edge of the preceding WE. 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.