AM29LV160M View Datasheet(PDF) - Advanced Micro Devices

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AM29LV160M

16 Megabit (2 M x 8-Bit/1 M x 16-Bit) MirrorBit™ 3.0 Volt-only Boot Sector Flash Memory

Advanced Micro Devices 

Data Sheet

programming begins, however, the device ignores reset commands until the op-

eration 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 during Erase Suspend).

Autoselect Command Sequence

The autoselect command sequence allows the host system to access the manu-

facturer and devices codes, and determine whether or not a sector is protected.

Table 10, on page 31 and Table 11, on page 32 show the address and data re-

quirements. This method is an alternative to that shown in Table 4, on page 15,

which is intended for PROM programmers and requires VID on address bit A9.

The autoselect command sequence is initiated by writing two unlock cycles, fol-

lowed 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 XX01h returns the device code. A read cycle containing a sector address

(SA) and the address XX02h in word mode (or XX04h in byte mode) returns

XX01h if that sector is protected, or 00h if it is unprotected. Refer to Table 2, on

page 13 and Table 3, on page 14 for valid sector addresses.

The system must write the reset command to exit the autoselect mode and return

to reading array data.

Word/Byte Program Command Sequence

The system may program the device by word or byte, depending on the state

of the BYTE# pin. Programming 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 re-

quired to provide further controls or timings. The device automatically

generates the program pulses and verifies the programmed cell margin.

Table 10, on page 31 and Table 11, on page 32 show the address and data re-

quirements for the byte program command sequence. Note that the Secured

Silicon Sector, autoselect, and CFI functions are unavailable when a program

operation is in progress.

When the Embedded Program algorithm is complete, the device then returns to

reading array data and addresses are no longer latched. The system can deter-

mine the status of the program operation by using DQ7, DQ6, or RY/BY#. See

“Write Operation Status” on page 33 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 operation. The Byte Program command 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

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Am29LV160M

25974B5 January 31, 2007

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