Motorola MSC8101 ADS User's Guide Page 291

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MSC8101 User’s Guide Appendix B-1
Appendix B
Glossary
This glossary presents an alphabetical list of terms, phrases, and abbreviations that are used
in this manual. Many of the terms are defined in the context of how they are used in this
manual—that is, in the context of the MSC8101. Some of the definitions are derived from
Newton’s Telecom Dictionary: The Official Dictionary of Telecommunications,
© 1998 by
Harry Newton.
AAL
ATM adaptation layer. This layer of the ATM Protocol Reference
Model is divided into the convergence sublayer (CS) and the
segmentation and reassembly (SAR) sublayer. The AAL
accomplishes conversion from the higher-layer, native data format
and service specifications of the user data into the ATM layer.
AAU
Address arithmetic unit. On the SC140 core, there are two identical
AAUs. Each contains a 32-bit full adder called an offset adder that can
add or subtract two AGU registers, add immediate value, increment or
decrement an AGU register, add PC, or add with reverse-carry. The
offset adder also performs compare or test operations and arithmetic
and logical shifts. The offset values added in this adder are pre-shifted
by 1, 2, or 3, according to the access width. In reverse-carry mode, the
carry propagates in the opposite direction. A second full adder, called
a modulo adder, adds the summed result of the first full adder to a
modulo value, M or minus M, where M is stored in the selected
modifier register. In modulo mode, the modulo comparator tests
whether the result is inside the buffer, by comparing the results to the
B register, and chooses the correct result from between the offset
adder and the modulo adder.
ABI
Application binary interface.
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