Section 52 is further connected to a bit wide internal information bus 56 by bus Bus 60 also connects the section 52 to a bit wide external information bus
MIMD, decoupled access or execute Abstract A microprocessor integrator circuit includes split nanocode memories which M1a bus210 simultaneous execution of an arithmetic operation and an operand fetch for maximizing through-put.
The circuit also includes a shared sequencing arithmetic logic unit which handles all microcode sequencing plus memory address sequencing. The circuit also provides nanocode sequencing which enables storage of constants and data in a microcode space which can include an off-chip writable control store.
In addition, two level microcode is utilized to enable long routines to be vertically encoded without the overhead of a large number of read only memory outputs. Description This application is a continuation-in-part of patent application Ser.
More particularly, it relates to such improvements in microprocessor system design which are especially adapted to provide a floating point microprocessor capable of handling more complex operations than can be carried out with microprocessor system configurations in the prior art.
Most especially, it relates to such a microprocessor system configuration and microprocessor integrated circuit which implements two level double sequenced control. As conventionally practiced, the microcode is stored in a read only memory ROM or a programmable logic array PLA structure forming a part of the microprocessor integrated circuit.
In particular, the Intel floating point microprocessor is believed to be described in U. The typical on chip microcode memory provides the microcode with a single level of control.
Such a single level of control limits the number and complexity of microcode instructions that can be provided in a microprocessor integrated circuit, given the M1a bus210 constraints of even very large scale integration VLSI microprocessor integrated circuits. For these and related reasons, the prior art has considered various approaches for introducing a hierarchical control system for microprocessor microcode storage and manipulation.
The state of the prior art in such hierarchical control of microprograms is summarized in S. In particular, it is known in the prior art to provide a two level control for microcode, with both levels of control having their code stored on a microprocessor integrated circuit.
The higher level instructions are then termed microcode, and the more elemental level is termed nanocode. This approach eliminates much duplication of terms in different instructions which results from a single level control system, but some duplication still remains.
Furthermore, because of the large number of connections required to both stores, off chip expansion of the microcode is still not practical. This approach has been extended in the prior art to a three level control scheme by adding a higher level of instructions, termed "macrocode".
With a three level control scheme, a limited amount of off chip expansion of instructions becomes possible, but a substantial time delay penalty is required with three levels of macro-micro-nanacode.
Although pipelining can reduce this delay somewhat, a three level control system is of only limited value in microprocessor integrated circuits. External microcode has also been implemented in bit slice 4-bit microprocessors where it is easier to implement, since all the microcode is off the chip.
The attractiveness of implementing external microcode in microprocessor integrated circuits is thus appreciated in the prior art. However, despite considerable development to date, there remains a need for further improvement in techniques for implementing such external microcode in order to allow user specification of microcode, without long delay cycles inherent in having user microcode implemented in the microprocessor integrated circuit itself during its fabrication.
It is another object of the invention to provide such a control scheme that will further permit more complex user-defined instructions than possible in the prior art to be stored externally of the microprocessor integrated circuit, yet be treated by the microprocessor in the same manner as internally stored instructions.
It is still another object of the invention to provide a system organization for a microprocessor which will operate efficiently with a hierarchical control scheme. The attainment of these and related objects may be achieved through use of the novel microprocessor system and microprocessor integrated circuit disclosed herein.
In one aspect of the invention, this microprocessor integrated circuit has an instruction sequence register connected to supply an instruction address to a first level instruction memory.
An instruction register is connected to receive an instruction from the first level instruction memory. A terminal on the microprocessor integrated circuit is preferably connectable to an external, additional first level instruction memory to supply an address from the instruction sequence register to the external memory.
Another terminal on the microprocessor integrated circuit is also preferably connectable to supply an instruction from the first level external instruction register to the instruction register.
A second level instruction PLA is connected to receive an address from the instruction register. A second level instruction memory is also connected to receive an address from the first level instruction register.Running head: [M1A BUS [M1A BUS] Anthony Johnson Allied American University Author Note This paper was prepared for [Business Statistics I], [M1A] taught by [John Hannon].
[M1A BUS] Anthony Johnson Allied American University Author Note This paper was prepared for [Business Statistics I], [M1A] taught by [John Hannon]. PART I: APPLICATION Directions: Please answer each of the following questions (responses should be at least two paragraphs in length and be written in complete sentences, if applicable).
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Running head: [M1A BUS] [M1A BUS] Anthony Johnson Allied American University Author Note This paper was prepared for [Business Statistics I], [M1A] taught by [John Hannon].PART I: APPLICATION Directions: Please answer each of the following questions (responses should be at least two paragraphs in length and be written in complete sentences, if applicable).
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