AM29SL160C datasheet(27/52 Pages) AMD

27 / 52 page

January 23, 2007 21635C5

Am29SL160C

D A TA

SH EE T

After the erase operation is suspended, the system can

read array data from or program data to any sector not

selected for erasure. (The device “erase suspends” all

sectors selected for erasure.) Normal read and write

timings and command definitions apply. Reading at any

address within erase-suspended sectors produces

status data on DQ7–DQ0. The system can use DQ7, or

DQ6 and DQ2 together, to determine if a sector is

actively erasing or is erase-suspended. See “Write

Operation Status” on page 27 for information on these

status bits.

After an erase-suspended program operation is com-

plete, the system can once again read array data within

non-suspended sectors. The system can determine

the status of the program operation using the DQ7 or

DQ6 status bits, just as in the standard program oper-

ation. See “Write Operation Status” on page 27 for

more information.

The system may also write the autoselect command

sequence when the device is in the Erase Suspend

mode. The device allows reading autoselect codes

even at addresses within erasing sectors, since the

codes are not stored in the memory array. When the

device exits the autoselect mode, the device reverts to

the Erase Suspend mode, and is ready for another

valid operation. See “Autoselect Command Sequence”

on page 22 for more information.

The system must write the Erase Resume command

(address bits are “don’t care”) to exit the erase suspend

mode and continue the sector erase operation. Further

writes of the Resume command are ignored. Another

Erase Suspend command can be written after the

device resumes erasing.

Notes:

1. See Table 12, on page 26 for erase command sequence.

2. See “DQ3: Sector Erase Timer” on page 29 for more in-

formation.

Figure 4.

Erase Operation

START

Write Erase

Command Sequence

Data Poll

from System

Data = FFH?

Yes

Erasure Completed

Embedded

Erase

algorithm

in progress

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