G - Physics – 06 – F
Patent
G - Physics
06
F
354/230.74
G06F 9/22 (2006.01) G06F 9/26 (2006.01) G06F 13/36 (2006.01) G06F 13/42 (2006.01) H03K 23/66 (2006.01)
Patent
CA 1154169
ABSTRACT OF THE DISCLOSURE A data processing system using microcode architecture in which a two-level microcode system comprises one or more first, or "horizontal", microinstructions and a plurality of second, or "vertical", microinstruction portions in a vertical microcontrol store. In a preferred embodiment the vertical microinstruction portions include one or more "modifier" fields, a selection field for selecting a horizontal microinstructions and a sequencing field for selecting the next vertical microinstruction portion of a sequence thereof, one or more fields of the horizontal microinstructions being capable of modification by the vertical modifier fields in order to form output microinstructions for performing data processing operations. Unique bus protocol signals are generated to prevent simultaneous access to the system bus by two competing system components and to permit substantially immediate control of the systems bus by a component without requiring a CPU decision thereon. Further, a unique system I/O interface unit permits access to cer- tain I/O components via other I/O buses, such unit utilizing a unique polling technique to identify on an updated basis, all components present on one of such other buses. The system I/O interface unit also includes a unique fre- quency synthesizer unit for providing at least one clock signal having a substantially constant frequency which can be generated in response to any one of a plurality of input clock signals each having a different frequency.
370565
Bernstein David H.
Carberry Richard A.
Druke Michael B.
Gusowski Ronald I.
Data General Corporation
Smart & Biggar
LandOfFree
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