MX29F4000PC-70 データシートの表示（PDF） - Macronix International

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MX29F4000PC-70

4M-BIT [512KX8] CMOS EQUAL SECTOR FLASH MEMORY

Macronix International 

MX29F4000

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

happeds later, while the command(data) is latched on

the rising edge of WE or CE, whichever happeds first.

Sector addresses selected are loaded into internal

register on the sixth falling edge of WE or CE,

whichever happeds later. Each successive sector load

cycle started by the falling edge of WE or CE,

whichever happeds later must begin within 30us from

the rising edge of the preceding WE or CE, whichever

happeds 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.

Table 4. Write Operation Status

Status

Q7 Q6 Q5 Q3

Q2

Note1

Note2

Byte Program in Auto Program Algorithm

Q7 Toggle 0 N/A No Toggle

Auto Erase Algorithm

0 Toggle 0

1

Toggle

Erase Suspend Read

1 No 0 N/A Toggle

In Progress

(Erase Suspended Sector)

Toggle

Erase Suspended Mode

Erase Suspend Read

Data Data Data Data Data

(Non-Erase Suspended Sector)

Erase Suspend Program

Q7 Toggle 0 N/A

N/A

Byte Program in Auto Program Algorithm

Q7 Toggle 1 N/A No Toggle

Exceeded Auto Erase Algorithm

0 Toggle 1

1

Toggle

Time Limits Erase Suspend Program

Q7 Toggle 1 N/A

N/A

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.

P/N:PM0629

REV. 1.0, DEC. 20, 1999

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