The R8000's instruction buffer is a FIFO (first-in/first-out) queue in which each entry is a quadword (i.e., 128 bits) containing four instructions read from the instruction cache.
One of the tangential benefits of ETC (Enhanced Throughput Cellular) design is that it works, albeit not at its best, when present in only one-half of a modem-to-modem connection.
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