A method and a circuit for avoiding memory access collisions during asynchronous
read-write access to a single-port RAM (SPRAM) are described. Serial write access
by means of a serial interface and read access with a read strobe from an independent
read device are generated asynchronously. Prerequisites for the implementation
are: firstly, use of a serial interface providing a serial clock signal; secondly,
write access to SPRAM has to occur at the end of serial transmission; thirdly,
a write strobe impulse has to be short compared to the original read strobe. Energy
saving is achieved by guaranteeing only one regular read strobe, even when multiple
write accesses occur during one read access. The read strobe signal can therefore
be used also for control of an LCD backplane counter.
