MX29LV040TC-70 datasheet(10/51 Pages) MCNIX

Part #	MX29LV040TC-70

Description	4M-BIT [512K x 8] CMOS SINGLE VOLTAGE 3V ONLY EQUAL SECTOR FLASH MEMORY

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Manufacturer	MCNIX [Macronix International]

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10

P/N:PM0722

MX29LV040

REV. 0.7, JUL. 12, 2001

READING ARRAY DATA

The device is automatically set to reading array data

after device power-up. No commands are required to

retrieve data.The device is also ready to read array data

after completing an Automatic Program or Automatic

Erase algorithm.

After the device accepts an Erase Suspend command,

the device enters the Erase Suspend mode. The sys-

tem can read array data using the standard read tim-

ings, except that if it reads at an address within erase-

suspended sectors, the device outputs status data. After

completing a programming operation in the Erase

Suspend mode, the system may once again read array

data with the same exception. See rase Suspend/Erase

Resume Commands” for more infor-mation on this mode.

The system

must issue the reset command to re-en-

able the device for reading array data if Q5 goes high, or

while in the autoselect mode. See the "Reset Command"

section, next.

RESET COMMAND

Writing the reset command to the device resets the

device to reading array data. Address bits are don't care

for this command.

The reset command may be written between the se-

quence cycles in an erase command sequence before

erasing begins. This resets the device to reading array

data. Once erasure begins, however, the device ignores

reset commands until the operation is complete.

The reset command may be written between the se-

quence cycles in a program command sequence be-fore

programming begins. This resets the device to reading

array data (also applies to programming in Erase

Suspend mode). Once programming begins,however, the

device ignores reset commands until the operation is

complete.

The reset command may be written between the se-

quence cycles in an SILICON ID READ command

sequence. Once in the SILICON ID READ mode, the

reset command

must be written to return to reading array

data (also applies to SILICON ID READ during Erase

Suspend).

If Q5 goes high during a program or erase operation,

writing the reset command returns the device to read-

ing array data (also applies during Erase Suspend).

SECTOR ERASE COMMANDS

The Automatic Sector Erase does not require the de-

vice to be entirely pre-programmed prior to executing

the Automatic Sector Erase Set-up 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

(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 50us 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.

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MX29LV040TC-70 Datasheet(PDF) 10 Page - Macronix International

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