AM29SL160C datasheet(27/52 Pages) AMD

27 / 52 page

November 1, 2004

Am29SL160C

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 29 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 operation.

See “Write Operation Status” on page 29 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 24 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 28 for erase command sequence.

2. See “DQ3: Sector Erase Timer” on page 31 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

AM29SL160C Datasheet(PDF) 27 Page - Advanced Micro Devices

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