MX29F004TTC-90 データシートの表示（PDF） - Macronix International

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MX29F004TTC-90

4M-BIT [512KX8] CMOS FLASH MEMORY

Macronix International 

MX29F004T/B

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 Auto-

matic Sector Erase command. Upon executing the Au-

tomatic 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 "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 happens later, while the command (data) is

latched on the rising edge of WE or CE, whichever hap-

pens 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, which-

ever happens later must begin within 30us from the ris-

ing edge of the preceding WE or CE, whichever hap-

pens first. Otherwise, the loading period ends and inter-

nal auto sector erase cycle starts. (Monitor Q3 to deter-

mine 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:PM0554

REV. 1.9, OCT. 19, 2004

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