M29F200BT, M29F200BB

8/22

The Block Protection Status of each block can be

the block. The other address bits may be set to ei-

ed then 01h is output on Data Inputs/Outputs

DQ0-DQ7, otherwise 00h is output.

Program Command. The

Program

command

can be used to program a value to one address in

the memory array at a time. The command re-

quires four Bus Write operations, the final write op-

eration latches the address and data in the internal

state machine and starts the Program/Erase Con-

troller.

If the address falls in a protected block then the

Program command is ignored, the data remains

unchanged. The Status Register is never read and

no error condition is given.

During the program operation the memory will ig-

nore all commands. It is not possible to issue any

command to abort or pause the operation. Typical

program times are given in Table 6. Bus Read op-

erations during the program operation will output

the Status Register on the Data Inputs/Outputs.

See the section on the Status Register for more

details.

After the program operation has completed the

memory will return to the Read mode, unless an

error has occurred. When an error occurs the

memory will continue to output the Status Regis-

ter. A Read/Reset command must be issued to re-

set the error condition and return to Read mode.

Note that the Program command cannot change a

bit set at ’0’ back to ’1’ and attempting to do so will

cause an error. One of the Erase Commands must

be used to set all the bits in a block or in the whole

memory from ’0’ to ’1’.

Unlock Bypass Command. The Unlock Bypass

command is used in conjunction with the Unlock

Bypass Program command to program the memo-

ry. When the access time to the device is long (as

with some EPROM programmers) considerable

time saving can be made by using these com-

mands. Three Bus Write operations are required

to issue the Unlock Bypass command.

Once the Unlock Bypass command has been is-

sued the memory will only accept the Unlock By-

pass Program command and the Unlock Bypass

Reset command. The memory can be read as if in

Read mode.

Unlock Bypass Program Command. The

Un-

lock Bypass Program command can be used to

program one address in memory at a time. The

command requires two Bus Write operations, the

final write operation latches the address and data

in the internal state machine and starts the Pro-

gram/Erase Controller.

The Program operation using the Unlock Bypass

Program command behaves identically to the Pro-

gram operation using the Program command. A

protected block cannot be programmed; the oper-

ation cannot be aborted and the Status Register is

read. Errors must be reset using the Read/Reset

command, which leaves the device in Unlock By-

pass Mode. See the Program command for details

on the behavior.

Table 6. Program, Erase Times and Program, Erase Endurance Cycles

Parameter

Min

Typical after

Max

Unit

Chip Erase (All bits in the memory set to ‘0’)

0.8

0.8

sec

Chip Erase

2.5

2.5

10

sec

Block Erase (64 Kbytes)

0.6

0.6

4

sec

Program (Byte or Word)

8

8

150

µs

Chip Program (Byte by Byte)

2.3

2.3

9

sec

Chip Program (Word by Word)

1.2

1.2

4.5

sec

Program/Erase Cycles (per Block)

100,000

cycles