AM29SL160C datasheet(25/52 Pages) AMD

25 / 52 page

January 23, 2007 21635C5

Am29SL160C

D A TA

SH EE T

During the unlock bypass mode, only the Unlock

Bypass Program and Unlock Bypass Reset commands

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

must issue the two-cycle unlock bypass reset

command sequence. The first cycle must contain the

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

are don’t cares. The device then returns to reading

array data.

The device offers accelerated program operations

through the WP#/ACC pin. This function is intended

only to speed in-system programming of the device

during system production. When the system asserts

HH on the WP#/ACC pin, the device automatically

enters the Unlock Bypass mode. The system may then

write the two-cycle Unlock Bypass program command

sequence. The device uses the higher voltage on the

WP#/ACC pin to accelerate the operation. Note that the

WP#/ACC pin must not be at V

HH for any operation

other than accelerated programming, or device

damage may result. In addition, the WP#/ACC pin must

not be left floating or unconnected; inconsistent

behavior of the device may result.

Figure 3 illustrates the algorithm for the program oper-

ation. See “Erase/Program Operations” on page 38 for

parameters, and Figure 17, on page 39 for timing

diagrams.

START

Write Program

Command Sequence

Data Poll

from System

Verify Data?

Yes

Last Address?

Yes

Programming

Completed

Increment Address

Embedded

Program

algorithm

in progress

Note: See Table 12, on page 26 for program command

sequence.

Figure 3.

Program Operation

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