Microinstruction sequencer having multiple control stores for lo

Details Microinstruction sequencer having multiple control stores for lo Microinstruction sequencer having multiple control stores for lo

1992-11-13

1998-06-09

Shah, Alpesh M.

Boots, shoes, and leggings

395580, 395595, 3642328, 3642464, 3642613, 3642627, 364DIG1, G06F 922

Patent

active

057650071

ABSTRACT:
First and second banks of control stores are used to store microinstructions. Each bank contains three control stores: A horizontal control store, a vertical control store, and a jump control store. The horizontal control store contains the rank four microcode; the vertical control store contains the rank three microcode; and the jump control store contains the same microcode as the vertical control store but is used on conditional jump microoperations. This allows simultaneous accessing of different microinstructions using a single address incrementer. The control store banks are accessed in an overlapping manner so that upon each clock cycle one bank is loading the rank 3 and rank 4 registers. The sequencer according to the present invention includes a return address stack for returning from subroutine calls and trap routines. When processing trap routines, the return address stack stores two microinstruction addresses to allow processing of a previously encountered jump or call operation that may have been aborted when the trap routine was entered.

REFERENCES:
patent: 3909797 (1975-09-01), Gross et al.
patent: 4027291 (1977-05-01), Tokura et al.
patent: 4112502 (1978-09-01), Scheuneman
patent: 4325121 (1982-04-01), Gunter et al.
patent: 4373180 (1983-02-01), Linde
patent: 4390946 (1983-06-01), Lane
patent: 4439827 (1984-03-01), Wilkes
patent: 4519033 (1985-05-01), Vaughn et al.
patent: 4546431 (1985-10-01), Horvath
patent: 4571673 (1986-02-01), Horst et al.
patent: 4574344 (1986-03-01), Harris et al.
patent: 4613935 (1986-09-01), Couleur
patent: 4754396 (1988-06-01), Horst et al.
patent: 4812970 (1989-03-01), Kitamura et al.
patent: 4823252 (1989-04-01), Horst et al.
patent: 4837681 (1989-06-01), Fuller
patent: 4841434 (1989-06-01), Mathews, Jr. et al.
patent: 4890218 (1989-12-01), Bram
patent: 4901235 (1990-02-01), Vora et al.
patent: 4907192 (1990-03-01), Kaneko
patent: 5021977 (1991-06-01), Sakaguchi
patent: 5101341 (1992-03-01), Circello et al.

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