AT49SN6416 Datasheet, PDF (9/42 Pages) ATMEL Corporation – 64-megabit (4M x 16) Burst/Page Mode 1.8-volt Flash Memory

AT49SN6416(T)
3.12.3
Sector Protection Detection
A software method is available to determine if the sector protection Softlock or Hardlock features
are enabled. When the device is in the software product identification mode a read from the I/O0
and I/O1 at address location 00002H within a sector will show if the sector is unlocked, soft-
locked, or hardlocked.
Table 3-3.
I/O1
0
0
1
1
Sector Protection Status
I/O0
Sector Protection Status
0
Sector Not Locked
1
Softlock Enabled
0
Hardlock Enabled
1
Both Hardlock and Softlock Enabled
3.13
Read Status Register
The status register indicates the status of device operations and the success/failure of that oper-
ation. The Read Status Register command causes subsequent reads to output data from the
status register until another command is issued. To return to reading from the memory, issue a
Read command.
The status register bits are output on I/O7 - I/O0. The upper byte, I/O15 - I/O8, outputs 00H
when a Read Status Register command is issued.
The contents of the status register [SR7:SR0] are latched on the falling edge of OE or CE
(whichever occurs last), which prevents possible bus errors that might occur if status register
contents change while being read. CE or OE must be toggled with each subsequent status read,
or the status register will not indicate completion of a Program or Erase operation.
When the Write State Machine (WSM) is active, SR7 will indicate the status of the WSM; the
remaining bits in the status register indicate whether the WSM was successful in performing the
preferred operation (see Table 3-4).
9
3464C–FLASH–2/05