AM29BDD160G datasheet(41/79 Pages) AMD

41 / 79 page

June 7, 2006

Am29BDD160G

ability to determine if the device is in Erase or Program

Suspend. Before the device enters Erase or Program

Suspend, the DQ6 pin toggles between two immedi-

ately consecutive reads from the same address. After

the device has entered Erase suspend, DQ6 stops

toggling between two immediately consecutive reads

to the same address. During the Sector Erase opera-

tion and also in Erase suspend mode, two immediately

consecutive readings from the erase-suspended sec-

tor causes DQ2 to toggle. DQ2 does not toggle if read-

ing from a non-busy (non-erasing) sector (stored data

is read). No bits are toggled during program suspend

mode. Software must keep track of the fact that the

device is in a suspended mode.

After entering the erase-suspend-read mode, the sys-

tem may read or program within any non-suspended

sector:

■ A read operation from the erase-suspended bank

returns polling data during the first 8 µs after the

erase suspend command is issued; read operations

thereafter return array data. Read operations from

the other bank return array data with no latency.

■ A program operation while in the erase suspend

mode is the same as programming in the regular

program mode, except that the data must be pro-

grammed to a sector that is not erase suspended.

Write operation status is obtained in the same man-

ner as a normal program operation.

Sector Erase and Program Resume

Command

The Sector Erase and Program Resume command

(30h) resumes a Sector Erase or Program operation

that has been suspended. Any further writes of the

Sector Erase and Program Resume command ig-

nored. However, another Sector Erase and Program

Suspend command can be written after the device has

resumed sector erase operations. Note that until a

suspended program or erase operation has resumed,

the contents of that sector are unknown.

The Sector Erase and Program Resume Command is

ignored if the SecSi sector is enabled.

Configuration Register Read Command

The Configuration Register Read command is used to

verify the contents of the Configuration Register. Exe-

cution of this command is only allowed while in user

mode and is not available during Unlock Bypass mode

or during Security mode. The Configuration Register

Read command is preceded by the standard two-cycle

“unlock” sequence, followed by the Configuration Reg-

ister Read command (C6h), and finally followed by

performing a read operation to the bank address spec-

ified when the C6h command was written. Reading the

other bank results in reading the flash memory con-

tents. The contents of the Configuration Register are

place on DQ15–DQ0. If WORD# is at V

IH (32-bit DQ

Bus), the contents of DQ31–DQ16 are XXXXh and

should be ignored. The user should execute the

Read/Reset command to place the device back in

standard user operation after executing the Configura-

tion Register Read command.

The Configuration Register Read Command is fully

operational if the SecSi sector is enabled.

Configuration Register Write Command

The Configuration Register Write command is used to

modify the contents of the Configuration Register. Ex-

ecution of this command is only allowed while in user

mode and is not available during Unlock Bypass mode

or during Security mode. The Configuration Register

Write command is preceded by the standard two-cycle

“unlock” sequence, followed by the Configuration Reg-

ister Write command (D0h), and finally followed by

writing the contents of the Configuration Register to

any address. The contents of the Configuration Regis-

ter are place on DQ15–DQ0. If WORD# is at V

(32-bit DQ Bus), the contents of DQ31–DQ16 are

XXXXh and are ignored. Writing the Configuration

Suspend modes are executing results in the contents

of the Configuration Register not being updated.

The Configuration Register Read Command is fully

operational if the SecSi sector is enabled.

Common Flash Interface (CFI) Command

The Common Flash Interface (CFI) command pro-

vides device size, geometry, and capability information

directly to the users system. Flash devices that sup-

port CFI, have a “Query Command” that returns infor-

mation about the device to the system. The Query

structure contents are read at the specific address lo-

cations following a single system write cycle where:

■ A 98h query command code is written to 55h ad-

dress location within the device’s address space

■ The device is initially in any valid read state, such as

“Read Array” or “Read ID Data”

Other device statistics may exist within a long se-

quence of commands or data input; such sequences

must first be completed or terminated before writing of

the 98H Query command, otherwise invalid Query

data structure output may result.

N ote th a t f o r d a t a bu s bi t s gr e a te r th a n DQ 7

(DQ31–DQ8), the valid Query access code has all ze-

roes (“0”s) in the upper DQ bus locations. Thus, the

16-bit Query command code is 0098h and the 32-bit

Query command code is 00000098h.

To terminate the CFI operation, it is necessary to exe-

cute the Read/Reset command.

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