Other

Daming Jin

Dean A Mulla

Douglas John Cutter

Tom Grutkowski

Thomas Grutkowski

The inventive control logic provides the selection signals for a bi-endian rotator MUX. The logic determines the starting point for the data transfer by determining which input register byte is going to Byte of the output register. The control logic passes the starting point to single decoder. The decoded value is then sent to a plurality of MUXs, one for each of the output register bytes. Each of the MUXs is prewired to receive a portion of bits of the decoded value, and the portion is arranged in a particular order. The MUXs then send their respective outputs to the rotator MUX as selection control signals.

Distributed MUX scheme for bi-endian rotator circuit

The inventive adder can perform carry look-ahead calculations for a bi-endian adder in a cache memory system. The adder can add one of &plus;/&minus;1, 4, 8, or 16 to a loaded value from memory, and the operation can be a 4 or 8 byte add. The inventive adder comprises a plurality of byte adder cells and carry look-ahead (CLA) logic. The adder cells determine which of themselves is the least significant bit (LSB) byte adder cell. The LSB cell then adds one of the increment values to its loaded value. The other cells add 0x00 or 0xFF, depending upon the sign of the increment value, to a loaded value from memory. Each adder performs two adds, one for a carry-in of 0, and the other for a carry in of 1. Both results are sent to a MUX. The CLA logic determines each of the carries, and provides a selection control signal to each MUX. of the different cells.

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Fort Collins, CO, United States of America

Daming Jin