MX26L6420MC-90 データシートの表示（PDF） - Macronix International

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MX26L6420MC-90

64M-BIT [4M x 16] CMOS MULTIPLE-TIME-PROGRAMMABLE EPROM

Macronix International 

MX26L6420

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.

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 before

programming begins. This resets the device to reading

array data. 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.

If Q5 goes high during a program or erase operation,

writing the reset command returns the device to reading

array data.

SILICON ID READ COMMAND SEQUENCE

The SILICON ID READ command sequence allows the

host system to access the manufacturer and devices

codes, and determine whether or not. Table 4 shows the

address and data requirements. This method is an

alternative to that shown in Table 1, which is intended for

EPROM programmers and requires VID on address bit

A9.

The SILICON ID READ command sequence is initiated

by writing two unlock cycles, followed by the SILICON

ID READ command. The device then enters the SILICON

ID READ mode, and the system may read at any address

any number of times, without init iating another command

sequence. A read cycle at address XX00h retrieves the

manufacturer code. A read cycle at address XX01h re-

turns the device code.

The system must write the reset command to exit the

autoselect mode and return to reading array data.

WORD PROGRAM COMMAND SEQUENCE

The command sequence requires four bus cycles, and

is initiated by writing two unlock write cycles, followed

by the program set-up command. The program address

and data are written next, which in turn initiate the

Embedded Program algorithm.The system is not required

to provide further controls or timings. The device

automatically generates the program pulses and verifies

the programmed cell margin. Table 4 shows the address

and data requirements for the byte program command

sequence.

When the Embedded Program algorithm is complete, the

device then returns to reading array data and addresses

are no longer latched. The system can determine the

status of the program operation by using Q7, Q6. See

"Write Operation Status" for information on these status

bits.

Any commands written to the device during the Em-

bedded Program Algorithm are ignored. Note that a

hardware reset immediately terminates the programming

operation. The Word Program command sequence should

be reinitiated once the device has reset to reading array

data, to ensure data integrity.

Programming is allowed in any sequence. A bit cannot

be programmed from a "0" back to a "1". Cause the Data

Polling algorithm to indicate the operation was successful.

However, a succeeding read will show that the data is

still "0". Only erase operations can convert a "0" to a

"1".

P/N:PM0823

REV. 0.5, JAN. 29, 2002

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