AM29LV116B datasheet(17/40 Pages) AMD

17 / 40 page

Am29LV116B

PREL I M I N AR Y

quence should be reinitiated once the device has reset

to reading array data, to ensure data integrity.

Programming is allowed in any sequence and across

sector boundaries. A bit cannot be programmed

from a “0” back to a “1”. Attempting to do so may halt

the operation and set DQ5 to “1,” or cause the Data#

Polling algorithm to indicate the operation was suc-

cessful. However, a succeeding read will show that the

data is still “0”. Only erase operations can convert a “0”

to a “1”.

Unlock Bypass Command Sequence

The unlock bypass feature allows the system to pro-

gram bytes to the device faster than using the standard

program command sequence. The unlock bypass com-

mand sequence is initiated by first writing two unlock

cycles. This is followed by a third write cycle containing

the unlock bypass command, 20h. The device then en-

ters the unlock bypass mode. A two-cycle unlock by-

pass program command sequence is all that is

required to program in this mode. The first cycle in this

sequence contains the unlock bypass program com-

mand, A0h; the second cycle contains the program ad-

dress and data. Additional data is programmed in the

same manner. This mode dispenses with the initial two

unlock cycles required in the standard program com-

mand sequence, resulting in faster total programming

time. Table 9 shows the requirements for the command

sequence.

During the unlock bypass mode, only the Unlock By-

pass Program and Unlock Bypass Reset commands

are valid. To exit the unlock bypass mode, the system

must issue the two-cycle unlock bypass reset com-

mand sequence. The first cycle must contain the data

90h; the second cycle the data 00h. Addresses are

don’t cares for both cycles. The device then returns to

reading array data.

Figure 3 illustrates the algorithm for the program oper-

ation. See the Erase/Program Operations table in “AC

Characteristics” for parameters, and to Figure 15 for

timing diagrams

Note: See Table 9 for program command sequence.

Figure 3.

Program Operation

START

Write Program

Command Sequence

Data Poll

from System

Verify Data?

Yes

Last Address?

Yes

Programming

Completed

Increment Address

Embedded

Program

algorithm

in progress

21359C-6

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