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Disclosed is a method to use unit distance consecutive addresses for first-in, first-out registers (FIFOs) with standard memories. Benefits include improved performance and improved power consumption.
English (United States)
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67% of the total text.
Method to use unit distance consecutive addresses for FIFOs
with standard memories
Disclosed is a method to use unit distance consecutive addresses
for first-in, first-out registers (FIFOs) with standard memories. Benefits
include improved performance and improved power consumption.
typically use binary counters for their read and write pointers. When the count
increases, many bits in the pointer switch with different propagation delays.
As these bits switch, the FIFO memory that is addressed by the read counter
consumes power as various intermediate addresses are selected and read out from
A unit distance counter
switches only 1 bit from one count value to the next consecutive count value.
Unit distance counters can be used on a standard memory that is binary
addressable as long as the sequence of the read pointer matches the sequence of
the write pointer. The implementation of a unit distance counter typically
takes less logic and runs faster than a binary counter.
disclosed method uses unit distance counters for the read and write pointers.
As the unit distance counter increases, only 1 bit switches. The next element
from the FIFO’s memory is accessed without intermediate accesses (see Figure
1). This approach saves memory access power.
the chip resets, both the read pointer and the write pointer are initialized to
the same value. Because both pointers go through the same unit distance code
sequence, the order in which da...