AM29SL160C datasheet(24/52 Pages) AMD

24 / 52 page

Am29SL160C

21635C5 January 23, 2007

D A TA

SH EE T

before programming begins. This resets the device to

reading array data (also applies to programming in

Erase Suspend mode). Once programming begins,

however, the device ignores reset commands until the

operation is complete.

The reset command may be written between the

sequence cycles in an autoselect command sequence.

Once in the autoselect mode, the reset command must

be written to return to reading array data (also applies

to autoselect during Erase Suspend).

If DQ5 goes high during a program or erase operation,

writing the reset command returns the device to

reading array data (also applies dur ing Erase

Suspend).

See “AC Characteristics” on page 35 for parameters, and

to Figure 14, on page 36 for the timing diagram.

Autoselect Command Sequence

The autoselect command sequence allows the host

system to access the manufacturer and device codes,

and determine whether or not a sector is protected.

Table 12, on page 26 shows the address and data

requirements. This method is an alternative to that

shown in Table 4, on page 14, which is intended for

PROM programmers and requires V

ID on address bit

A9.

The autoselect command sequence is initiated by

writing two unlock cycles, followed by the autoselect

command. The device then enters the autoselect

mode, and the system may read at any address any

number of times, without initiating another command

sequence. A read cycle at address XX00h retrieves the

manufacturer code. A read cycle at address 01h in

word mode (or 02h in byte mode) returns the device

code. A read cycle containing a sector address (SA)

and the address 02h in word mode (or 04h in byte

mode) returns 01h if that sector is protected, or 00h if it

is unprotected. Refer to Table 2, on page 12 and

Table 3, on page 13 for valid sector addresses.

The system must write the reset command to exit the

autoselect mode and return to reading array data.

Enter SecSi Sector/Exit SecSi Sector Com-

mand Sequence

The SecSi Sector region provides a secured data area

containing a random, sixteen-byte electronic serial

number (ESN). The system can access the SecSi

Sector region by issuing the three-cycle Enter SecSi

Sector command sequence. The device continues to

access the SecSi Sector region until the system issues

the four-cycle Exit SecSi command sequence. The Exit

SecSi command sequence returns the device to

normal operation. Table 12, on page 26 shows the

address and data requirements for both command

sequences. See also “Secured Silicon (SecSi) Sector

Flash Memor y Region” on page 18 for fur ther

information.

Word/Byte Program Command Sequence

The system may program the device by word or byte,

depending on the state of the BYTE# pin. Program-

ming is a four-bus-cycle operation. The program

command sequence 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 tim-

ings. The device automatically generates the program

pulses and verifies the programmed cell margin.

Table 12, on page 26 shows the address and data

requirements fo r the by te progra m comm and

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

DQ7, DQ6, or RY/BY#. See “Write Operation Status”

on page 27 for information on these status bits.

Any commands written to the device during the

Embedded Program Algorithm are ignored. Note that a

hardware reset immediately terminates the program-

ming op erat ion . Th e Byt e Pro gra m co mm and

sequence should be reinitiated once the device resets

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 shows 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

program bytes or words to the device faster than using

the standard program command sequence. The unlock

bypass command 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 enters the unlock bypass mode. A two-

cycle unlock bypass program command sequence is all

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

in this sequence contains the unlock bypass program

command, A0h; the second cycle contains the program

address and data. Additional data is programmed in

the same manner. This mode dispenses with the initial

two unlock cycles required in the standard program

command sequence, resulting in faster total program-

ming time . Ta b l e 1 2 , on page 26 sho w s the

requirements for the command sequence.

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