Write Operation Status
Several bits, I/O2, I/O3, I/O5, I/O6, and I/O7, are provided in
the A29002/A290021 to determine the status of a write
operation. Table 6 and the following subsections describe
the functions of these status bits. I/O7, I/O6 and I/O2 each
offer a method for determining whether a program or erase
operation is complete or in progress. These three bits are
I/O7: Data Polling
The Data Polling bit, I/O7, indicates to the host system
whether an Embedded Algorithm is in progress or
completed, or whether the device is in Erase Suspend.
Data Polling is valid after the rising edge of the final WE
pulse in the program or erase command sequence.
During the Embedded Program algorithm, the device
outputs on I/O7 the complement of the datum programmed
to I/O7. This I/O7 status also applies to programming
during Erase Suspend. When the Embedded Program
algorithm is complete, the device outputs the datum
programmed to I/O7. The system must provide the
program address to read valid status information on I/O7.
If a program address falls within a protected sector, Data
Polling on I/O7 is active for approximately 2µs, then the
device returns to reading array data.
During the Embedded Erase algorithm, Data Polling
produces a "0" on I/O7. When the Embedded Erase
algorithm is complete, or if the device enters the Erase
Suspend mode, Data Polling produces a "1" on I/O7.This
is analogous to the complement/true datum output
described for the Embedded Program algorithm: the erase
function changes all the bits in a sector to "1"; prior to this,
the device outputs the "complement," or "0." The system
must provide an address within any of the sectors selected
for erasure to read valid status information on I/O7.
After an erase command sequence is written, if all sectors
selected for erasing are protected, Data Polling on I/O7 is
active for approximately 100µs, then the device returns to
reading array data. If not all selected sectors are
protected, the Embedded Erase algorithm erases the
unprotected sectors, and ignores the selected sectors that
When the system detects I/O7 has changed from the
complement to true data, it can read valid data at I/O7 -
I/O0 on the following read cycles. This is because I/O7 may
change asynchronously with I/O0 - I/O6 while Output
Enable ( OE ) is asserted low. The Data Polling Timings
(During Embedded Algorithms) figure in the "AC
Characteristics" section illustrates this. Table 6 shows the
outputs for Data Polling on I/O7. Figure 4 shows the
Data Polling algorithm.
Address = VA
I/O7 = Data ?
I/O5 = 1?
Read I/O7 - I/O0
Address = VA
I/O7 = Data ?
1. VA = Valid address for programming. During a sector
erase operation, a valid address is an address within any
sector selected for erasure. During chip erase, a valid
address is any non-protected sector address.
2. I/O7 should be rechecked even if I/O 5 = "1" because
I/O7 may change simultaneously with I/O 5.
Figure 4. Data Polling Algorithm
PRELIMINARY (June, 2000, Version 0.2)
AMIC Technology, Inc.