Computers as Components, 2nd Edition

78 CHAPTER 2 Instruction Sets

The block repeat start and end registers RSA0L and REA0L keep track of the start

and end points of the block.

The block repeat register 1 BRC1 and block repeat save register 1 BRS1 are used

to repeat blocks of instructions. There are two repeat start address registers RSA0

and RSA1. Each is divided into low and high parts: RSA0L and RSA0H, for example.

Four temporary registers T0,T1,T2, and T3 are used for various calculations.

Two transition register TRN0 and TRN1 are used for compare-and-extract-

extremum instructions. These instructions are used to implement the Viterbi

algorithm.

Several registers are used for addressing ...