S29AS008J datasheet(39/55 Pages) SPANSION

39 / 55 page

November 9, 2011 S29AS008J_00_09

S29AS008J

Data

She e t

12.6

DQ5: Exceeded Timing Limits

DQ5 indicates whether the program or erase time has exceeded a specified internal pulse count limit. Under

these conditions DQ5 produces a 1. This is a failure condition that indicates the program or erase cycle was

not successfully completed.

The DQ5 failure condition may appear if the system tries to program a 1 to a location that is previously

programmed to 0. Only an erase operation can change a 0 back to a 1. Under this condition, the device

halts the operation, and when the operation has exceeded the timing limits, DQ5 produces a 1.

Under both these conditions, the system must issue the reset command to return the device to reading array

data.

12.7

DQ3: Sector Erase Timer

After writing a sector erase command sequence, the system may read DQ3 to determine whether or not an

erase operation has begun. (The sector erase timer does not apply to the chip erase command.) If additional

sectors are selected for erasure, the entire time-out also applies after each additional sector erase command.

When the time-out is complete, DQ3 switches from 0 to 1. The system may ignore DQ3 if the system can

guarantee that the time between additional sector erase commands will always be less than 50

μs. See

also Sector Erase Command Sequence on page 31.

After the sector erase command sequence is written, the system should read the status on DQ7 (Data#

Polling) or DQ6 (Toggle Bit I) to ensure the device has accepted the command sequence, and then read

DQ3. If DQ3 is 1, the internally controlled erase cycle has begun; all further commands (other than Erase

Suspend) are ignored until the erase operation is complete. If DQ3 is 0, the device will accept additional

sector erase commands. To ensure the command has been accepted, the system software should check the

status of DQ3 prior to and following each subsequent sector erase command. If DQ3 is high on the second

status check, the last command might not have been accepted. Table 12.1 shows the outputs for DQ3.

Notes

1. DQ5 switches to 1 when an Embedded Program or Embedded Erase operation has exceeded the maximum timing limits. See DQ5:

Exceeded Timing Limits on page 39 for more information.

2. DQ7 and DQ2 require a valid address when reading status information. Refer to the appropriate subsection for further details.

Table 12.1 Write Operation Status

Operation

DQ7

(Note 2)

DQ6

DQ5

(Note 1)

DQ3

DQ2

(Note 2)

RY/BY#

Standard

Mode

Embedded Program Algorithm

DQ7#

Toggle

N/A

No toggle

Embedded Erase Algorithm

Toggle

Erase

Suspend

Mode

Reading within Erase

Suspended Sector

No toggle

N/A

Toggle

Reading within Non-Erase

Suspended Sector

Data

Erase-Suspend-Program

DQ7#

Toggle

N/A

S29AS008J 데이터시트(PDF) 39 Page - SPANSION

S29AS008J 데이터시트(HTML) 39 Page - SPANSION

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

데이터시트 다운로드

링크 URL