Question: - How to reset the FIFO? - How to operate /MR? - What is a proper reset?
Answer:
The FIFOs need a proper Master Reset after turning on the power. A reset pulse
empties the device and sets the flags to represent the empty state. If a complete
and correct master reset cycle is not accomplished, the FIFO will not work properly.
The exact constraints of a reset cycle are defined in the datasheets. Usually there is
a minimum reset pulse which must be met. Giving the device a reset pulse includes
both an assertion and de-assertion edge to the reset pin. In addition, the read and
write enable signals for all FIFO's normally must be disabled during the reset pulse
except with some devices when programming the PAE and PAF flags. Also, one needs
to make sure that there is no noise pulse on the /MR signal when interfacing with
other devices. Any noise on reset may lead to an improper reset which may result in
some problems.
