Token generator

Details Token generator Token generator

1981-05-29

1985-02-26

Thomas, James D.

Boots, shoes, and leggings

G06F 1300

Patent

active

045021112

ABSTRACT:
An arrangement for identifying and disassembling a series of instructions of variable length stored in a prefetch buffer includes a set of controlled multiplexer circuits for selectively transferring the contents of specified register of the prefetch buffer to a ring or loop-configured shift registers, termed a "byte rotator", which functions as a temporary adjustable storage device. That portion of the byte rotator which contains the opcode token of the instruction read out of the prefetch buffer is decoded to determine the length of each token. Once the length of the first token is known, it can be determined where the second or next token begins. In the same fashion, each successive token is transferred to the byte rotator until all tokens for the current instructions have been used. The next token is the opcode for the following instruction. Each time the byte rotator is loaded with a new series of tokens, as multiplexed out of the prefetch buffer, its contents are rotated by an amount based upon the length of the previous token, in order that the lowermost or first stage of the byte rotator will contain the next token of the instruction, whereby the above decoding procedure may again be carried out. The controlled rotation of the contents of the byte rotator also causes the sequence of tokens of the instruction to be transferred to the token register to be arranged in the proper order for transfer.

REFERENCES:
patent: 3581287 (1971-05-01), Greenspan
patent: 3875391 (1975-04-01), Shapiro
patent: 4025771 (1977-03-01), Lynch, Jr.
patent: 4075688 (1978-02-01), Lynch, Jr.
patent: 4079451 (1978-03-01), Woods
patent: 4109310 (1978-08-01), England
patent: 4194241 (1980-03-01), Mager
patent: 4236206 (1980-11-01), Strecker
patent: 4335277 (1982-06-01), Puri

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