High speed byte shifter for a bi-directional data bus

Claim 1

High speed byte shifting appratus for shifting bytes of data presented on a bi-directional bus, comprising: a bi-directional bus having a plurality of different byte lines representative of 0 to N bytes, a plurality of byte shifters, one for each byte line, each said byte shifter being provided with a plurality of input ports, one connected to each of said byte lines, each of said input ports of each byte shifter being arranged in a order sequence representative of no shift of the 0 to N bytes up to N shift of the bytes at the input of the byte shifters, each of said byte shifters having a buffer register adapted to be connected to one of said input ports for receiving and storing the contents of a different selected byte line, shift select control means coupled to said input ports and said bi-directional bus for enabling a different input port in each of said byte shifters so that a different byte from each one of said different byte lines is stored in each of said buffer registers of said byte shifters, and each of said byte shifters including return byte line means controlled by said select shift control means for connecting the contents of each of said buffer registers of said byte shifters to one of said different byte lines, whereby a desired shift of said bytes of data is provided on said bi-directional bus.

Claim 9

A method of shifting a plurality of bytes of data on a bi-directional data bus of the type having a plurality of byte lines and input and output registers employing byte shifters of the type having a single buffer register for each byte comprising the steps of: connecting each byte line of the data bus to a byte shifter of the type having an input port for each byte line, enabling one of said input ports of each byte shifter, storing the data byte being presented at the enabled input ports in the buffer register of each of the byte shifters, and transferring the data bytes in the buffer registers of each of the byte shifters to a byte line of the data bus which is different from the byte line connected to the enabled input port.

Claim 10

A method of shifting a plurality of bytes of data on a bi-directional data bus of the type having a plurality of byte lines and input and output registers employing byte shifters of the type having a single buffer register for each byte comprising the steps of: connecting each byte line of the data bus to a byte shifter of the type having an input port for each byte line, enabling one of said input ports of each byte shifter, storing the data byte being presented at the enabled input ports in the buffer register of each of the byte shifters, and transferring the data bytes in the buffer registers of each of the byte shifters to a byte line of the data bus which is different from the byte line connected to the enabled input port.