9

P/N:PM0578

MX29F800T/B

REV. 1.7, JUL. 24, 2001

(no erase verification command is required). Sector

erase is a six-bus cycle operation. There are two "un-

lock" 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 30us 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.

SECTOR ERASE COMMANDS

The Automatic Sector Erase does not require the de-

vice to be entirely pre-programmed prior to executing

the Automatic Set-up Sector Erase command and Au-

tomatic Sector Erase command. Upon executing the

Automatic Sector Erase command, the device will auto-

matically 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

Status

Q7

Q6

Q5

Q3

Q2

RY/BY

Note1

Note2

Byte Program in Auto Program Algorithm

Q7

Toggle

0

N/A

No

0

Toggle

Auto Erase Algorithm

0

Toggle

0

1

Toggle

0

Erase Suspend Read

1

No

0

N/A Toggle

1

(Erase Suspended Sector)

Toggle

In Progress

Erase Suspended Mode

Erase Suspend Read

Data

Data

Data

Data

Data

1

(Non-Erase Suspended Sector)

Erase Suspend Program

Q7

Toggle

0

N/A

N/A

0

Byte Program in Auto Program Algorithm

Q7

Toggle

1

N/A

No

0

Toggle

Exceeded

Time Limits

Auto Erase Algorithm

0

Toggle

1

1

Toggle

0

Erase Suspend Program

Q7

Toggle

1

N/A

N/A

0

Table 4.Write Operation Status

Note:

1. Q7 and Q2 require a valid address when reading status information. Refer to the appropriate subsection for further

details.

2. Q5 switches to '1' when an Auto Program or Auto Erase operation has exceeded the maximum timing limits.

See "Q5:Exceeded Timing Limits " for more information.