A29L160AM datasheet(21/42 Pages) AMICC

21 / 42 page

A29L160A Series

(May, 2005, Version 0.1)

AMIC Technology, Corp.

The I/O5 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, I/O5

produces a "1."

Under both these conditions, the system must issue the reset

command to return the device to reading array data.

I/O3: Sector Erase Timer

After writing a sector erase command sequence, the system

may read I/O3 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, I/O3 switches from "0" to "1." The system may

ignore I/O3 if the system can guarantee that the time

between additional sector erase commands will always be

less than 50

µs. See also the "Sector Erase Command

Sequence" section.

After the sector erase command sequence is written, the

system should read the status on I/O7 (

Data Polling) or I/O6

(Toggle Bit 1) to ensure the device has accepted the

command sequence, and then read I/O3. If I/O3 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 I/O3 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 I/O3 prior to and following each

subsequent sector erase command. If I/O3 is high on the

second status check, the last command might not have been

accepted. Table 10 shows the outputs for I/O3.

START

Read I/O7-I/O0

Toggle Bit

= Toggle ?

Program/Erase

Operation Not

Commplete, Write

Reset Command

Yes

Notes :

1. Read toggle bit twice to determine whether or not it is

toggling. See text.

2. Recheck toggle bit because it may stop toggling as I/O5

changes to "1". See text.

Read I/O7 - I/O0

Twice

I/O5 = 1?

Toggle Bit

= Toggle ?

Yes

Program/Erase

Operation Complete

Read I/O7-I/O0

(Notes 1,2)

Figure 6. Toggle Bit Algorithm

(Note 1)

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