摘要:
A method and apparatus that performs anticipatory rounding of intermediate results in a floating point arithmetic system while the intermediate results are being normalized is disclosed. One embodiment of the present invention includes four logic levels, implemented in N-NARY logic. In the first three logic levels, propagation information is gathered for preselected bit groups from the coarse and medium shift output of the normalizer as those results become available. In the fourth level, an incremented, normalized intermediate single-precision or double-precision mantissa result is produced by combining fine shift output bit values with propagation information for the appropriate top bit group, middle bit group, and bottom bit group. The appropriate bit groups are determined by examining the value of the fine shift select signal.
摘要:
The present invention comprises a method and apparatus for a pipeline of functional units with a late pipe functional unit that executes instructions without stalling until the result is available. The present invention comprises one or more earlier functional units coupled to a late pipe functional unit. The late pipe functional unit does not begin executing instructions until all of the input operands are or will be available for execution so that the late pipe functional unit will execute instructions without stalling until the result will be available in a fixed number of cycles. The present invention further comprises a late pipe functional unit that may comprise a floating point unit, a graphics unit, or an enhanced floating point unit. And finally, the late pipe functional unit is non-stalling and or is non-cancelable.
摘要:
Footwear comprising a sole formed from a first resilient material for attenuating the shock of impact to a wearer during running or walking, and a second material harder than the first material for providing firm support for a foot. The sole has heel, arch and toe sections, each of which have medial and lateral regions. The sole also has a forefoot section having a first region for supporting the first, second, third, fourth and fifth metatarsal heads of the foot, associated phalanges and metatarsal phalangeal joints, and the metatarsal necks associated with the fourth and fifth metatarsal heads, and a second region for supporting the metatarsal necks associated with the second and third metatarsal heads. The sole is formed so that the first resilient material is positioned in the lateral region of the heel section, the lateral region of the arch section, and the first region of the forefoot section, and so that the second harder material is positioned in the medial region of the arch section, and the second region of the forefoot section.
摘要:
A multiprocessor system provides for a restartable stop condition that is fast and easily implemented. The multiprocessor system includes a plurality of processors. Each of the processors includes a bidirectional stop pin, which normally when asserted indicates that an error has been detected. Each of the plurality of processors also includes a scan port. The plurality of processors in the multiprocessor system are coupled together via their respective stop pins. By switching the stop pins to a different mode whereby an assertion of the pin causes the receiving processor to enter a restartable stop condition as a result of a restartable stop condition being achieved by the driving processor, the multiprocessor system can be quickly stopped. The restartable system stop technique when implemented utilizing a plurality of processors in which each of the processors include this stop pin provides both a straightforward and fast method for stopping a multiprocessor system in a restartable manner following the occurrence of any particular event. This commonly includes an instruction address breakpoint, single instruction step, data address breakpoint, or specific JTAG instruction. Memory coherency in the multiprocessor system is maintained throughout, such that functional clocks may be stopped, the machine state observed and restored in a non-destructive manner via scan, and functional clocks and code execution can then be restarted.
摘要:
In general, this invention is directed to a rail and slider system having residential and commercial organizational applications. In one aspect, the system comprises at least one rail and a slider mounted on the rail for sliding movement along the rail. The rail and slider have teeth which releasably engage with one another for locking the slider at selected positions along the rail. A spring device on the slider urges the slider toward a locked position. The slider is manually movable against the urging of the spring device from its locked position to an unlocked position in which the teeth on the arms and the tracks are disengaged to permit sliding movement of the slider along the rail to a different selected position. Various items can be attached to the slider, e.g., a funnel-shaped holder and shelf bracket. In other aspects, the slider is configured for snap-mounting on the rail, and a kit is provided including at least two rails and sliders, and a template for mounting the rails on a surface such that the rails are in proper position relative to one another.
摘要:
An apparatus and method for integer to floating-point format conversion. A processor may include an adder configured to perform addition of respective mantissas of two floating-point operands to produce a sum, where a smaller-exponent one of the floating-point operands has a respective exponent less than or equal to a respective exponent of a larger-exponent one of the floating-point operands. The processor may further include an alignment shifter coupled to the adder and configured, in a first mode of operation, to align the floating-point operands prior to the addition by shifting the respective mantissa of the smaller-exponent operand towards a least-significant bit position. The alignment shifter may be further configured, in a second mode of operation, to normalize an integer operand by shifting the integer operand towards a most-significant bit position. The second mode of operation may be active during execution of an instruction to convert the integer operand to floating-point format.
摘要:
An efficient leading zero/leading one anticipator (LZA) that can operate in parallel with a floating point adder is disclosed. In one embodiment, the LZA can be implemented in three levels of N-NARY logic, wherein the first logic level generates dit-level propagate-generate-zero (PGZ) patterns and carry out signals from the input dits of the adder operands. The second logic level produces a find-zero and a find-one output signal for each two-dit group of the adder result by combining PGZ patterns for the two dits within the group with the carry-out signal from the dit immediately preceding the two-dit group. The third logic level combines find-zero and find-one output signals for each two-dit group to produce find-one and find-zero coarse and medium shift select signals.
摘要:
The present invention describes an apparatus and method that formats the output fraction result of an ANSI/IEEE 754-1985 floating point arithmetic operation where parallel normalization and rounding of the intermediate fraction result has occurred. The output fraction is formatted using all or some of the bits from the output of either the rounder circuit or the normalizer circuit.
摘要:
Footwear including a sole having a front and a back for supporting a bottom of a foot. A heel cup at the back of the sole receives and supports a heel of the foot. The heel cup has a bottom for further supporting the bottom of the foot and a side wall extending up from the bottom. The side wall has a generally concave rear section for receiving and supporting the back of the heel and opposite side sections extending forward from the rear section. The recess in the rear section of the side wall of the heel cup is offset laterally from a longitudinal central vertical plane of the heel cup. The recess is sized for accommodating the rearwardly protruding lateral posterior portion of the calcaneus of the foot.
摘要:
A freezer that uses liquid cryogen as a refrigerant includes an inner vessel defining a storage chamber and an outer jacket generally surrounding the inner vessel so that an insulation space is defined there between. A heat exchanger is positioned in a top portion of the storage chamber and has an inlet in communication with a supply of the liquid cryogen refrigerant so that the liquid cryogen refrigerant selectively flows through the heat exchanger to cool the storage chamber while being vaporized. A purge line is in communication with the outlet of the heat exchanger and includes a purge outlet positioned over the exterior of the heat exchanger. A purge valve is positioned within the purge line so that the vaporized liquid cryogen from the heat exchanger is selectively directed to the exterior of the heat exchanger to reduce ice formation on the heat exchanger.