摘要:
An earth engaging implement comprising an earth engaging portion located forwardly and below an integral socket portion which socket is tapered in cross-section from its top toward its junction with the earth engaging portion and includes strengthening adjacent the upper end of the socket. The socket is formed by a single piece of metal formed into a partial socket with opposing flanges defining the near face of said socket. The flanges may be closely spaced or if the tine is wide the flanges will be arranged to encompass the edges of the base of the tine. The strengthening may be an increase in the thickness of the flanges and the adjacent portion of the socket located in the top portion of the socket. Preferably, a rib is formed in the flanges just below the top portion of the socket.
摘要:
An earth engaging implement and tine construction comprising a tine having bolted thereto an adaptor having an upper surface externally tapered in cross section, an elongated slot extending through the adaptor to receive a bolt head, and the lower surface of the adaptor comprising a rediused portion and a flat portion. An earth engaging implement includes an earth engaging portion and an attachment portion, the attachment portion comprising a tapered socket of complementary cross sectional shape to the upper surface of the adaptor, and the earth engaging implement being secured to the adaptor by a wedging frictional grip on to the upper surface. The adaptor has an angle of inclination of the upper surface thereof when mounted on the tine which corresponds to the angle of attachment portion of the earth engaging implement when it is oriented for ground engagement.
摘要:
A method of and apparatus for determining and controlling the inertial attitude of a spinning artificial satellite without using a suite of inertial gyroscopes. The method and apparatus operate by tracking three astronomical objects near the Earth's ecliptic pole and the satellite's and/or star tracker's spin axis and processing the track information. The method and apparatus include steps and means for selecting preferably three astronomical objects using a histogram method and determining a square of a first radius (R12) of a track of a first astronomical object; determining a square of a second radius (R22) of a track of a second astronomical object; determining a square of a third radius (R32) of a track of a third astronomical object; determining the inertial attitude of the spin axis using the squares of the first, second, and third radii (R12, R22, and R32) to calculate pitch, yaw, and roll rate; determining a change in the pitch and yaw of the artificial satellite; and controlling on-board generated current flow to various orthogonally-disposed current-carrying loops to act against the Earth's magnetic field and to apply gyroscopic precession to the spinning satellite to correct and maintain its optimum inertial attitude.
摘要:
A wireless communications device includes a host processing unit, a modem processing unit, and a memory transport interface. The wireless communications device typically runs a variety of software tasks, some of which require considerably more memory than others. By processing the memory intensive tasks with the host processing unit and assigning tasks requiring high computing power but relatively smaller memory to the modem processor unit, a smaller on-chip memory can be used for the modem processor unit tasks. In addition, by using a messaging transport interface to transfer data between tasks running on different processing units, smaller local memories can be used in place of a shared memory. For example, by allocating and storing L1 tasks at the modem processing unit and allocating/storing L2 and L3 tasks at the host processing unit, duplicate memory components may be reduced or removed, thereby lowering system costs and improving system efficiency.
摘要:
A method of and apparatus for determining and controlling the inertial attitude of a spinning artificial satellite without using a suite of inertial gyroscopes. The method and apparatus operate by tracking three astronomical objects near the Earth's ecliptic pole and the satellite's and/or star tracker's spin axis and processing the track information. The method and apparatus include steps and means for selecting preferably three astronomical objects using a histogram method and determining a square of a first radius (R12) of a track of a first astronomical object; determining a square of a second radius (R22) of a track of a second astronomical object; determining a square of a third radius (R32) of a track of a third astronomical object; determining the inertial attitude of the spin axis using the squares of the first, second, and third radii (R12, R22, and R32) to calculate pitch, yaw, and roll rate; determining a change in the pitch and yaw of the artificial satellite; and controlling on-board generated current flow to various orthogonally-disposed current-carrying loops to act against the Earth's magnetic field and to apply gyroscopic precession to the spinning satellite to correct and maintain its optimum inertial attitude.
摘要:
A super-scalar microprocessor performs operations upon a plurality of instructions at each of its fetch, decode, execute, and write-back stages. To support such operations, the super-scalar microprocessor includes a dispatch arrangement including an instruction cache for fetching blocks of instructions including a plurality of instructions and an instruction decoder which decodes and dispatches the instructions to functional units for execution. The instruction decoder applies a dispatch criteria to selected instructions of each block of instructions and dispatches the selected instructions which satisfy the dispatch criteria. The dispatch criteria includes the requirement that the instructions be dispatched speculatively in order, that supporting operands be available for the execution of the instructions, or tagged values substituted that will be available later, and that the functional units required for executing the instructions be available. The operation of the instruction decoder and the instruction cache is coordinated by a preset protocol which assures that the instructions are dispatched in ascending consecutive order and that blocks of instructions are efficiently fetched for decode and dispatch by the instruction decoder.
摘要:
A processor is configured to detect a branch instruction have a forward branch target address within a predetermined range of the branch fetch address of the branch instruction. If the branch instruction is predicted taken, instead of canceling subsequent instructions and fetching the branch target address, the processor allows sequential fetching to continue and selectively cancels the sequential instructions which are not part of the predicted instruction sequence (i.e. the instructions between the predicted taken branch instruction and the target instruction identified by the forward branch target address). Instructions within the predicted instruction sequence which may already have been fetched prior to predicting the branch instruction taken may be retained within the pipeline of the processor, and yet subsequent instructions may be fetched.
摘要:
A microprocessor including a pair of caches is provided. One of the pair of caches is accessed by stack-relative memory accesses from the decode stage of the instruction processing pipeline. The second of the pair of caches is accessed by memory accesses from the execute stage of the instruction processing pipeline. When a miss is detected in the first of the pair of caches, the stack-relative memory access which misses is conveyed to the execute stage of the instruction processing pipeline. When the stack-relative memory access accesses the second of the pair of caches, the cache line containing the access is transmitted to the first of the pair of caches for storage. The first of the pair of caches selects a victim line for replacement when the data is transferred from the second of the pair of caches. If the victim line has been modified while stored in the first cache, then the victim line is stored in a copyback buffer. A signal is asserted by the first cache to inform the second cache of the need to perform a victim line copyback. Requests from the execute stage of the instruction processing pipeline are stalled to allow the copyback to occur.
摘要:
A superscalar microprocessor is provided which includes a integer functional unit and a floating point functional unit that share a high performance main data processing bus. The integer unit and the floating point unit also share a common reorder buffer, register file, branch prediction unit and load/store unit which all reside on the same main data processing bus. Instruction and data caches are coupled to a main memory via an internal address data bus which handles communications therebetween. An instruction decoder is coupled to the instruction cache and is capable of decoding multiple instructions per microprocessor cycle. Instructions are dispatched from the decoder in speculative order, issued out-of-order and completed out-of-order. Instructions are retired from the reorder buffer to the register file in-order. The functional units of the microprocessor desirably accommodate operands exhibiting multiple data widths. High performance and efficient use of the microprocessor die size are achieved by the sharing architecture of the disclosed superscalar microprocessor.
摘要:
A microprogrammed parallel processor including a plurality of subprocessors operates under the control of microinstructions. Each microinstruction contains a plurality of micro-operations each of which requires one or more subprocessors for execution. All micro-operations for which required subprocessors are available are immediately carried out. Any remaining micro-operations within a microinstruction which are not executed due to lack of subprocessor availability are recycled. These remaining micro-operations are executed in subsequent cycles as a required subprocessor becomes available. The entire microinstruction is not recycled but only those portions of it, i.e., the unexecuted micro-operations, are recycled and executed in a subsequent cycle. The microinstruction being executed is stored in a latch until all micro-operations within the microinstruction are executed. At that time, the next microinstruction is fetched into the latch.