MX29LV320AT/B
still open. If Q3 is high ("1") the internally controlled
erase cycle has begun; attempts to write subsequent
commands to the device will be ignored until the erase
operation is completed as indicated by Data Polling or
Toggle Bit. If Q3 is low ("0"), the device will accept addi-
tional sector erase commands. To insure the command
has been accepted, the system software should check
the status of Q3 prior to and following each subsequent
sector erase command. If Q3 were high on the second
status check, the command may not have been accepted.
lect mode. The command is valid only when the device
is in the CFI mode.
If the time between additional erase commands from the
system can be less than 50us, the system need not to
monitor Q3.
RY/BY:READY/BUSY OUTPUT
The RY/BY is a dedicated, open-drain output pin that
indicates whether an Embedded Algorithm is in progress
or complete. The RY/BY status is valid after the rising
edge of the final WE pulse in the command sequence.
Since RY/BY is an open-drain output, several RY/BY pins
can be tied together in parallel with a pull-up resistor to
VCC .
If the output is low (Busy), the device is actively erasing
or programming. (This includes programming in the Erase
Suspend mode.) If the output is high (Ready), the device
is ready to read array data (includ-ing during the Erase
Suspend mode), or is in the standby mode.
QUERY COMMAND AND COMMON FLASH
INTERFACE (CFI) MODE
MX29LV320AT/B is capable of operating in the CFI mode.
This mode all the host system to determine the manu-
facturer of the device such as operating parameters and
configuration.Two commands are required in CFI mode.
Query command of CFI mode is placed first, then the
Reset command exits CFI mode.These are described in
Table 3.
The single cycle Query command is valid only when the
device is in the Read mode, including Erase Suspend,
Standby mode, and Automatic Select mode; however, it
is ignored otherwise.
The Reset command exits from the CFI mode to the
Read mode, or Erase Suspend mode, or Automatic Se-
P/N:PM1008
REV. 1.1, MAY 28, 2004
23
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