摘要:
A virtual memory unit (VMU) includes a state machine for controlling its operations in response to commands received from another unit. The state machine includes a plurality of programmable array logic (PAL) devices which are connected to gather status from the different sections of the unit. The outputs of the PAL devices connect in common and supply a first address input to an addressable state memory. The state memory includes a plurality of locations, each of which stores a binary code defining a different machine state. The state memory locations are accessed as a function of the status signals and current state and used in turn to generate the required subcommands for executing the received commands. The state machine makes it possible to easily classify the received commands to their complexity and urgency in terms of their effect on overall system performance.
摘要:
A last-in, first-out register having multiple address input ports and capable of storing a plurality of addresses. Address loading operations are over-lapped with address reading operations to speed up the rate at which addresses may be stored in and retrieved from the register. When the register is full of addresses it provides an indication which permits: the addresses already stored in the register to be read out and stored in an external memory, then additional addresses to be stored in the register, and subsequently the addresses transferred to the memory for storage to be retransferred to the buffer address register for read out.
摘要:
An address boundary detector is disclosed that functions with an arithmetic logic unit (ALU) in a computer processor while the ALU generates addresses by adding an offset or displacement to a base address. The detector monitors bits of addresses to determine whether a data item can be completely stored within the same block or page of memory as that addressed by the base address from which it was derived.
摘要:
A virtual memory unit (VMU) includes a state machine for controlling its operations in response to commands received from another unit. The state machine includes a plurality of programmable array logic (PAL) devices which are connected to gather status from the different sections of the unit. The outputs of the PAL devices connect in common and supply a first address input to an addressable state memory. The state memory includes a plurality of locations, each of which stores a binary code defining a different machine state. The state memory locations are accessed as a function of the status signals and current state and used in turn to generate the required subcommands for executing the received commands. The state machine makes it possible to easily classify the received commands to their complexity and urgency in terms of their effect on overall system performance.
摘要:
An emulator executes on a second data processing system as a second system user level process including a first system user level program, a first system executive program, and first system user and executive tasks. An emulator level is interposed between the second system user level process and a kernel level and contains pseudo device drivers. Each pseudo device driver corresponds to a first system input/output device. The kernel level includes kernel processes, each kernel process corresponding to a pseudo device driver. The second system hardware platform includes a plurality of second system input/output devices, wherein each second system input output device corresponds to a kernel process. Each combination of a pseudo device driver, a corresponding kernel process and a corresponding second system input/output device executes in a second system process and emulates the operations of a corresponding first system input/output task and the corresponding first system input/output device. The pseudo device drivers are constructed of a plurality of pseudo device queues, a return queue and a queue manager.
摘要:
A memory controller in which a number of local memories are primarily dedicated to the shared use of a number of local processors of a data processing system to increase the efficiency of use of both the processors and memories. A controller is associated with each local memory to control connection of any one of the local processors to its associated local memory. A local processor can also be connected via a controller and an adapter circuit connected to the controller to a system bus to obtain access to circuits connected thereto. In addition, a system processor connected to the system bus may also be connected to any particular one of the local memories via its associated controller and adapter connected thereto to load data or programs into the local memory for use by the local processors, and to read out the results of previous processing done by the local processors.
摘要:
A data selection matrix is disclosed which uses a plurality of programmed array logic (PAL) units having input thereto portions of binary words from a plurality of sources, the PALs being responsive to control words also input thereto to jointly select one of said sources of binary words and to select the arrangement of the portions of the binary words being input thereto from the selected source of binary words.
摘要:
What is disclosed is a time partitioned bus arrangement for use in a computer system wherein different circuits therein are interconnected by a plurality of busses and operation is such that information to be processed can be read out of one circuit, processed in some manner in another circuit, and the processed information be stored in the same or another circuit all within one cycle of a system clock in the computer system, and without the need for bus control circuits and bus interfaces in the circuitry connected to the busses. Some of the circuits have their input/output connected to only a single one of the busses, while other circuits have their input connected to one bus and their output connected to a different bus, and yet other circuits have either their input or output connected to one of the busses and their other input/output connected to circuitry external to the bus arrangement. Some of the processor circuits have a control lead input that is energized by the clock signal output from the system clock so that they accept information from one bus to which their input is connected during a first polarity portion of a clock cycle and return either unprocessed or processed information to another bus during a second polarity portion of a clock cycle.
摘要:
A logic control system comprised of a cache memory system and a transfer control logic unit is disclosed for accommodating the flow of both procedural information and CPU (central processing unit) instructions from a central memory system on a common communication bus to a CPU. The CPU and the transfer control logic unit communicate by way of the cache memory system with the common communication bus. In response to a CPU request to the central memory system, procedural information and instructions are requested by the transfer control logic unit from the cache memory system and presented to the CPU in such a manner as to avoid interruptions in CPU activity caused by information transfer delays.
摘要:
A priority resolver for providing unambiguous resolution of requests among competing processes vying for access to a common device and which is adapted to a non-distributed environment.