P R E L I M I N A R Y
Suspend mode, the RY/BY output will be high. For pro-
RY/BY: Ready/Busy Pin
gramming, the RY/BY is valid (RY/BY=0) after the ris-
ing edge of the fourth WE pulse in the four write pulse
sequence. For chip erase, the RY/BY is valid after the
rising edge of the sixth WE pulse in the six write pulse
sequence. For sector erase, the RY/BY is also valid
after the rising edge of the sixth WE pulse.
The Am29LV008 provides a RY/BY open-drain output
pin as a way to indicate to the host system that the Em-
bedded Algorithms are either in progress or have been
completed. If the output is low, the device is busy with
either a program or erase operation. If the output is
high, the device is ready to accept any read/write or
erase operation.When the RY/BY pin is low, the device
will not accept any additional program or erase com-
mands with the exception of the Erase Suspend com-
mand. If the Am29LV008 is placed in an Erase
Since the RY/BY pin is an open-drain output, several
RY/BY pins can be tied together in parallel with a
pull-up resistor to V
.
CC
Table 7. Toggle Bit Status
Mode
DQ7
DQ6
Toggles
Toggles
1
DQ2
1
Program
Erase
DQ7
0
Toggles
Toggles
1 (Note 2)
Erase-Suspend Read (Note 1) (Erase-Suspended Sector)
Erase Suspend Program
1
DQ7 (Note 2)
Toggles
Notes:
1. These status flags apply when outputs are read from a sector that has been erase suspended.
2. These status flags apply when outputs are read from the addresses of the non-erase suspended sector.
CE
LAST_BUS_CYCLE
WE
RY/BY
tBUSY
20511C-4
Figure 1. RY/BY Timing Diagram
18
Am29LV008T/Am29LV008B
CYPRESS [ CYPRESS ]
