PMC-Sierra Patent Grants

System and method for network switching

Granted: April 12, 2016
Patent Number: 9313563
Provided is a method and system for switching between signals in an optical transport network. The method includes extracting identification data from an OTN signal at a termination sink and inserting the identification data into an Ethernet packet. The system includes a termination sink configured to extract identification data from an OTN signal and insert the identification data into an Ethernet packet.

Demultiplexing high-order to low-order ODU signals in an optical transport network

Granted: March 15, 2016
Patent Number: 9288006
A method and apparatus are provided for de-multiplexing one or more Low-Order ODUj/ODUflex clients from a High-Order ODUk carrier. The number of TribSlots assigned to an ODUflex may be increased and decreased hitlessly, in accordance to ITU-T G.7044. In the Multiplexing direction, a Space-Time-Space switch is used to interleave bytes from Low-Order ODUk words into High-Order ODUk words. In the De-multiplexing direction, a similar switch is used to extract Low-Order ODUj bytes that are…

Apparatus and method for interoperability between SAS and PCI express

Granted: March 8, 2016
Patent Number: 9280508
Provided is an apparatus and method for enabling interoperability between a serial attached small computer system interface (SAS) protocol with a peripheral component interconnect express (PCIe) protocol. A SAS-PCIe bridge includes a SAS component configured to communicate with a SAS device in a SAS domain and a PCIe component configured to communicate with a PCIe switch in a PCIe domain. The SAS component and the PCIe component are configured to convert data between the SAS protocol and…

High bandwidth GFP demapper

Granted: March 1, 2016
Patent Number: 9276874
A system and method of delineating GFP data. The GFP framer comprises a candidate generator for generating an array of core header candidates from a data word received on a data bus, a candidate processor for generating a plurality of candidate tours and a frame delineator for identifying a candidate tour as an active tour and delineating the boundaries of the GFP frames defined by the active tour. Each core header candidate defines a reference position of one of the plurality of…

Sampling threshold detector for direct monitoring of RF signals

Granted: February 23, 2016
Patent Number: 9271163
The peak level of a high frequency analog signal in an RF receiver is detected by a system which samples the signal and compares it against a static threshold, generating an above/below status. The system is implemented with a sampler of sufficient aperture bandwidth to capture the signal in question, operated at a clock frequency, dynamically chosen as a function of fLO (local oscillator frequency) and the desired fIF (intermediate frequency), to minimize in-band intermodulation…

Management of linked lists within a dynamic queue system

Granted: February 16, 2016
Patent Number: 9262554
A method and apparatus are disclosed for management of linked lists within a dynamic queue system. In a dynamic queue system where a central memory is shared amongst a set of queues, the method organizes the linked list structures of the queues. The linked list pointers of the queues are organized over a set of single port memories. Memory for the queue entries is allocated in an alternating fashion, which allows the method to provide per-cycle access to queues while reducing the…

Methods and apparatus for SAS controllers with link list based target queues

Granted: February 9, 2016
Patent Number: 9256521
A controller comprising a transport layer, an internal memory, and a link list manager block. The internal memory stores pending instruction entries. The link list manager block is configured to read instructions stored in an external memory, update an active vector, the active vector for storing indications of instructions from the external memory; update the pending instruction entries in the internal memory; and update the instructions stored in the external memory. The link list…

Adaptive intelligent storage controller and associated methods

Granted: February 9, 2016
Patent Number: 9256542
A storage controller includes data transfer logic defined to enable block level data transfer between the storage controller and multiple types of storage media within a storage volume. The storage controller also includes adaptive logic defined to determine in real-time which of the multiple types of storage media in the storage volume is to be used to store a given data block received by the storage controller. The received data block is stored on a determined storage medium in the…

Shingled magnetic record hard disk drive and method for creating a logical disk from physical tracks

Granted: February 9, 2016
Patent Number: 9257144
A system for writing data to overlapping physical tracks of a shingled magnetic record (SMR) hard disk drive (HDD) and a method for creating a logical disk from overlapping physical tracks of the SMR HDD. The system comprises a write header and a memory identifying the overlapping physical tracks which are accessible through the logical disk. The physical tracks are spaced from each other by at least the width of the write header. The method comprises mapping in a memory the logical disk…

Duty-cycle distortion self-correcting delay line

Granted: February 9, 2016
Patent Number: 9257977
A duty-cycle distortion self-correcting delay line has an even number of programmable delay lines connected in series between a data signal input and a data signal output. Each programmable delay line is paired with a corresponding inverting element. A data signal propagated from the input to the output is passed un-inverted in half of the delay lines and is passed inverted in the other half of the delay lines. When the data signal is a square wave clock signal, a duty cycle distortion…

Method and apparatus for driving a laser diode

Granted: February 2, 2016
Patent Number: 9252563
A method and apparatus for powering up and powering down a laser diode and its driver are disclosed. The disclosed method and apparatus enable the use of deep sub-micron CMOS technology to build a laser diode driver (LDD), while ensuring the low voltage limits prescribed by such technology are not exceeded. Building an LDD with deep sub-micron CMOS technology pushes circuit integration further ahead, bringing cost of LDDs and required board circuits down.

System and method with reference voltage partitioning for low density parity check decoding

Granted: January 12, 2016
Patent Number: 9235467
A nonvolatile memory storage controller for delivering log likelihood ratios (LLRs) to a low-density parity check (LDPC) decoder for use in the decoding of an LDPC encoded codeword. The controller includes partitioning circuitry for identifying a set of soft-decision reference voltages having the smallest calculated introduced error value based upon the estimated BER of the nonvolatile memory. The controller further includes read circuitry for reading an LDPC encoded codeword stored in a…

System and method for random noise generation

Granted: January 12, 2016
Patent Number: 9235488
A random noise generation module for generating noisy LLRs for testing an error correction circuit of a nonvolatile memory storage module. The random noise generation module includes a coefficient generator for generating one or a plurality of coefficients, each of the plurality of coefficients associated with one region of a plurality of regions defining a linear space proportionately divided according to an area under a probability distribution curve for a nonvolatile memory storage…

System and method for synchronizing local oscillators

Granted: January 5, 2016
Patent Number: 9229433
Provided is a method and apparatus for aligning a first local oscillator (LO) clock generated by a controllable LO clock generator in a first radio frequency (RF) path with a second LO clock in a second RF path. The apparatus includes a synchronization channel configured to exchange a synchronization clock between the first and second RF paths, a phase detector configured to measure a phase alignment between the first and second LO clocks, and a loop filter configured to drive the…

Low-noise flexible frequency clock generation from two fixed-frequency references

Granted: January 5, 2016
Patent Number: 9231600
A number of methods and clock generator units are disclosed to produce low Phase Noise clocks for use in Radio Frequency systems. The methods and clock generator units all use two reference clocks: a frequency-accurate reference that has comparatively high Phase Noise, and a frequency-inaccurate reference such as that from a BAW or MEMS clock source that has comparatively low Phase Noise. By combining multiple Phase-Locked Loops and a mixer, it is possible to produce flexible output…

Threshold voltage adjustment in solid state memory

Granted: December 29, 2015
Patent Number: 9224479
A method is disclosed for setting or modifying a threshold voltage in a NAND flash memory, using an optimization method and based on an error, such as stored in a threshold voltage table. In an embodiment, a method is provided to optimize the read voltage on a NAND flash memory in order to minimize the errors on the NAND flash memory in the fewest reads operations as possible. Advantageously, the method of the present disclosure is more reliability as the method minimizes a Raw Bit Error…

System and method for synchronizing local oscillators

Granted: December 29, 2015
Patent Number: 9225507
Provided is a method and apparatus for aligning a first local oscillator (LO) clock generated by a controllable LO clock generator in a first radio frequency (RF) path with a second LO clock in a second RF path. The apparatus includes a synchronization channel configured to exchange a synchronization clock between the first and second RF paths, a phase detector configured to measure a phase alignment between the first and second LO clocks, and a loop filter configured to drive the…

Low-noise flexible frequency clock generation from two fixed-frequency references

Granted: December 29, 2015
Patent Number: 9225508
A number of methods and clock generator units are disclosed to produce low Phase Noise clocks for use in Radio Frequency systems. The methods and clock generator units all use two reference clocks: a frequency-accurate reference that has comparatively high Phase Noise, and a frequency-inaccurate reference such as that from a BAW or MEMS clock source that has comparatively low Phase Noise. By combining multiple Phase-Locked Loops and a mixer, it is possible to produce flexible output…

Programmable passive peaking equalizer

Granted: December 29, 2015
Patent Number: 9225563
A programmable passive peaking equalizer that can compensate for a frequency dependent loss of a variety of data channels is disclosed herein. Monotonic increase in signal loss vs. frequency of board traces, cables and even fiber causes significant distortion of transmitted data referred to as inter-symbol interference (ISI). Some embodiments of programmable passive equalizers disclosed herein can minimize ISI for a wide range of data channels with very low power penalty. Various…

Systems and methods for clock path single-ended DCD and skew correction

Granted: December 22, 2015
Patent Number: 9219470
A circuit and method for improving signal integrity characteristics of a non-full rate transmitter are disclosed herein. The circuit comprises an actuator block having an input for receiving a differential clock signal, the differential clock signal comprising a positive clock signal and a negative clock signal, the actuator configured to adjust a difference between the positive and negative clock signals; a sensing block, for sensing a difference between positive and negative signals of…