MX29F002NB Ver la hoja de datos (PDF) - Macronix International

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MX29F002NB

2M-BIT [256K x 8] CMOS FLASH MEMORY

Macronix International 

MX29F002/002N T/B

SET-UP AUTOMATIC 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 does not require 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 verification

begin. The erase and verification 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 does 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 verify 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 30us 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

(BOH) during the time-out period resets the device to read

mode.

the Sector Erase time-out immediately terminates the

time-out period and suspends the erase operation. After

this command has been executed, the command register

will initiate erase suspend mode. The state machine will

return to read mode automatically after suspend is ready.

At this time, state machine only allows the command

register to respond to the Read Memory Array, Erase

Resume and Program commands. The system can

determine the status of the program operation using the Q7

or Q6 status bits, just as in the standard program operation.

After an erase-suspended program operation is complete,

the system can once again read array data within non-

suspended sectors.

ERASE SUSPEND

This command is only valid while the state machine is

executing Automatic Sector Erase operation, and therefore

will only be responded during Automatic Sector Erase

operation. Writing the Erase Suspend command during

P/N: PM0547

REV. 1.5, MAR. 28, 2005

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