Patent application number | Description | Published |
20080215906 | Method for Fault Tolerant Time Synchronization Mechanism in a Large Scaleable Multi-Processor Computer - Redundant time-of-day (TOD) oscillators are aligned, within a master oscillator path, to local logic oscillator and used to create independent step-sync signals. A step checker validates and provides selection signals to identify which of the TOD oscillators operates according to a criterion. Independent step-sync signals are transmitted to several sibling chips. Local step and sync signals are delayed to arrive at TOD register nearly synchronous with TOD registers in sibling chips. A slave oscillator path may be used to select time signals generated in a sibling chip, whereby the master oscillator path is deselected. A primary control register set may be used to configure which among several chips is a master chip using the master oscillator path. All remaining chips are slave chips. All segments of the topology are redundant. One of multiple possible alternate topologies is defined in a secondary control register set. Commands and TOD values are passed on the fabric at predefined time increment boundaries to establish, restore, or maintain synchronization across all chips. | 09-04-2008 |
20080244300 | Fault Tolerant Time Synchronization Mechanism in a Scaleable Multi-Processor Computer - Redundant time-of-day (TOD) oscillators are aligned, within a master oscillator path, to local logic oscillator and used to create independent step-sync signals. A step checker validates and provides selection signals to identify which of the TOD oscillators operates according to a criterion. Independent step-sync signals are transmitted to several sibling chips. Local step and sync signals are delayed to arrive at TOD register nearly synchronous with TOD registers in sibling chips. A slave oscillator path may be used to select time signals generated in a sibling chip, whereby the master oscillator path is deselected. A primary control register set may be used to configure which among several chips is a master chip using the master oscillator path. All remaining chips are slave chips. All segments of the topology are redundant. One of multiple possible alternate topologies is defined in a secondary control register set. Commands and TOD values are passed on the fabric at predefined time increment boundaries to establish, restore, or maintain synchronization across all chips. | 10-02-2008 |
20080294706 | Novel Adder Structure with Midcycle Latch for Power Reduction - A digital adder circuit comprising a plurality of logical stages in the carry logic of said adder circuit, for generating and propagating predetermined groups of operand bits, each stage implementing a predetermined logic function and processing input variables from a preceding stage and outputting result values to a succeeding stage static and dynamic logic in the carry network of a 4-bit adder, and with output from the first stage fed directly as an input ( | 11-27-2008 |
20090021288 | Signal Delay Element, Method and Integrated Circuit Device for Frequency Adjustment of Electronic Signals - The invention relates to frequency adjustment of electronic signals. The method comprises the steps of providing an output signal of a frequency generator with a first frequency as input signal for a signal delay element providing an edge of said input signal of said signal delay element; delaying said input signal by adding a delay to each cycle of said input signal until the delayed output signal of the signal delay element is aligned to an edge of said input signal. | 01-22-2009 |
20120117524 | REUSABLE STRUCTURED HARDWARE DESCRIPTION LANGUAGE DESIGN COMPONENT - A method includes removing a code segment from a hardware description language design to create a modified hardware description language design. The code segment represents at least one time sensitive path in the hardware description language design. The method includes creating a delta list of differences between the modified hardware description language design and a physical hardware representation that is logically equivalent to the hardware description language design. The method includes extracting a portion of the physical hardware representation that corresponds to the time sensitive path based, at least in part, on the delta list. The method also includes creating a structured hardware description language design of the time sensitive path using the extracted portion of the physical hardware representation, wherein the structured hardware description language design comprises structural information of the extracted portion of the physical hardware representation. | 05-10-2012 |
20140136737 | LOW LATENCY DATA TRANSFER BETWEEN CLOCK DOMAINS OPERATED IN VARIOUS SYNCHRONIZATION MODES - Transferring data from a first clock domain to a second clock domain, wherein the second clock domain has a fixed clock frequency, and the first clock domain has a variable clock frequency. The first clock domain and the second clock domain operate in a synchronous mode when the variable clock frequency is equal to the fixed clock frequency, and in an asynchronous mode when the variable frequency is lower than the fixed frequency. A first buffer and a second buffer are used for a data transfer from the first clock domain to the second clock domain. The second clock domain comprises a multiplexor connected to the first buffer and the second buffer. The multiplexor forwards data from the first buffer further into the second clock domain in the synchronous mode and from the second buffer into the second clock domain in the asynchronous mode. | 05-15-2014 |