732 results about "Multi port" patented technology

The invention relates to the field of chip testing, in particular to a chip signal integrity test analysis method, device and equipment and a storage medium. The method comprises the following steps: extracting a chip performance index based on a chip design requirement document; performing saturation frequency excitation setting based on the chip performance index to generate an excitation test signal; performing a multi-port signal excitation test and parallel signal sampling based on the excitation test signal to generate a high signal-to-noise ratio response data set; obtaining a chip layout design file; performing chip communication link analysis on the chip layout design file, and constructing communication line layout data; performing signal mapping and waveform quality evaluation on the communication line layout data based on the high signal-to-noise ratio response data set to obtain a node signal distortion rate; and performing signal integrity quantization and theoretical signal integrity score comparison based on the node signal distortion rate, and marking a fault node. According to the invention, the chip testing efficiency is improved, and the signal abnormal part of the chip is accurately and efficiently detected.

The invention belongs to the field of PCIe (Peripheral Component Interconnect Express) chips, and relates to a CXL switching chip of a multi-core-grain architecture and a cross-core-grain routing switching method thereof, and a plurality of CXL switching core grains with uniform specifications are packaged and interconnected to form the CXL switching chip; each CXL switching core particle comprises a plurality of ports, each port can be configured to be in a CXL mode and a D2D mode, and the port of each CXL switching core particle at least comprises a physical layer, a CXL link layer, a CXL transaction layer, a D2D routing layer, a bypass and a multipath selection module; the CXL switching chip further comprises a multi-VC on-chip CXL switching network, and the multi-VC on-chip CXL switching network comprises at least one order-preserving switching VC and one out-of-order switching VC. According to the method, CXL switching chips of various specifications can be flexibly constructed, the design complexity and verification difficulty of the large-scale or multi-port CXL switching chips are effectively reduced, and the production yield of the chips is improved.

The invention discloses an offshore wind power collecting and sending-out system and method based on a multi-port multi-frequency alternating current and direct current hybrid integrated platform, and belongs to the field of power transmission and distribution of power systems. The system comprises an intermediate-frequency, power-frequency and low-frequency wind power collection subsystem, an offshore integrated platform, a direct-current sending-out submarine cable, a low-frequency sending-out submarine cable, an onshore converter station and an onshore frequency conversion station. The various wind power collection subsystems respectively collect wind turbine generator group outputs with corresponding frequencies and send the wind turbine generator group outputs to the offshore integrated platform; the offshore integrated platform converts intermediate-frequency, power-frequency and partial low-frequency electric energy into direct current and then transmits the direct current to the onshore converter station through the direct-current sending-out submarine cable, and the converter station converts the direct current into power-frequency alternating current; and after being boosted, the other low-frequency electric energy is sent to a land frequency conversion station through a low-frequency sending-out submarine cable to be converted into power-frequency alternating current, so that efficient collection and grid-connected sending-out of multi-frequency wind power resources are realized. According to the invention, the problem that a plurality of independent platforms need to be built in a complex multi-point grid-connected scene in the prior art can be solved.

A multi-port interface device for connecting multiple computing devices for data and power transfer includes a housing with an internal power source. A processor is electrically coupled to the internal power source. A power input port electrically coupled to the internal power source is designed to receive a power cord. The power cord is electrically couplable to an extrinsic power source to transfer power from the extrinsic power source to the internal power source. A plurality of ports electrically coupled to the processor is inset into the housing. Each port of the plurality of ports is exposed within the housing. The plurality of ports includes a plurality of universal serial bus ports and a memory card port.

Methods related to wireless communication systems and uplink (UL) rank adaptation are provided. A user equipment (UE) receives, from a base station (BS), a configuration indicating a resource associated with a plurality of UL reference signal ports. The UE determines, based on at least one of an overheating status, a throughput, or a latency, a quantity of transmission layers for a transmission. The UE transmits, to the BS, an indication of at least one of (1) one or more UL reference signal ports of the plurality of UL reference signal resources associated with the UL reference signal resource based on the quantity of transmission layers, or (2) a number of UL reference signal ports associated with the multi-port UL reference signal resource based on the quantity of transmission layers.

The invention belongs to the technical field of analog integrated circuit design and memory read-write, and provides a multi-valued RRAM read-write circuit with a write-and-read function. The multi-valued RRAM read-write circuit is a multi-port device capable of performing read-write simultaneously, in write operation, a low dropout regulator is utilized to provide voltage for the RRAM circuit and the standard resistance circuit, mirror current is generated, the resistance value of the RRAM is set to be the total resistance of the standard resistance circuit, an operational amplifier is connected into the circuit through a CMOS switch, and feedback is formed to stabilize the voltage at the two ends of the RRAM; and in the read operation, the CMOS switch is used for disconnecting the operational amplifier, and the voltage at the two ends of the RRAM device is directly read. Compared with an existing multi-valued read-write circuit, the multi-valued RRAM read-write circuit has the advantages that write-and-read multi-valued RRAM read-write is realized, and meanwhile, the read-write circuit is not separated, so that the write-in speed is increased, and the area of the read-write circuit is saved.

The invention belongs to the field of electromagnetic field numerical solution, and particularly provides a finite element mesh adaptive method for network parameter analysis of a multi-port microwave device, which comprises the following steps: firstly, establishing a geometric structure of the multi-port microwave device, setting simulation frequency, excitation and boundary conditions, and establishing an electromagnetic simulation model; secondly, performing preliminary division and finite element electromagnetic simulation calculation on a computational domain by adopting a tetrahedral mesh to obtain a numerical solution corresponding to each group of excitation, and synthesizing results based on a posterior error estimation method for posterior error estimation; and finally, according to a posterior error indication grid encryption parameter, carrying out simulation calculation again after encryption, and repeating the process until the solution meets the precision requirement. In conclusion, by combining the characteristics of a finite element algorithm and the characteristics of an error estimation algorithm, in the microwave device network parameter analysis process, multiple sets of excited numerical solutions are comprehensively used for posterior error estimation and grid adaptive encryption indication, so that the analysis precision of network parameters is improved.

The invention provides a method for testing the communication bandwidth of a 10-gigabit network between an FPGA (Field Programmable Gate Array) and a CPU (Central Processing Unit), which is applied to a radar system. The FPGA completes a function of regularly generating data and a function of downlink transmission of the data; the 10-gigabit network exchange board card completes data transmission and sends data to the CPU board card through a 10-gigabit network; and the CPU board card receives the data and calculates the communication bandwidth and the network quality. According to the invention, the limitation of traditional single-port point-to-point transmission or simple multi-port parallel transmission on synchronization, load balancing or protocol overhead is solved, and a solution is provided for how to effectively utilize multiple ports, enable the multiple ports to simultaneously and efficiently work and ensure parallel transmission of data without mutual interference.

The embodiment of the invention provides a CXL host controller, a data transmission method and a computer. The CXL host controller comprises a CXL host bridging module and a CXL multi-port controller, the CXL multi-port controller is connected with a physical link of the CXL equipment and is shared by a plurality of root ports managed by the CXL multi-port controller, and each root port is used for being connected with the corresponding CXL equipment; the plurality of root ports are activated by turns according to a time division multiplexing mechanism, and data transmission is carried out by using a physical link; the CXL host bridging module is used for receiving a processor message in a sending direction, converting the processor message into a CXL message and transmitting the CXL message to the CXL multi-port controller; and the CXL multi-port controller receives the CXL message of the CXL host bridging module in the sending direction, indicates the activated target root port based on the current clock period time division multiplexing signal, transmits a data packet corresponding to the CXL message to the target root port, and transmits the data packet to the CXL equipment through the target root port. According to the CXL host controller, multi-port expansion is realized, and higher compatibility and flexibility are provided for expansion of a CXL network and memory equipment.

The invention belongs to the technical field of power system automation, and discloses a power grid equivalence method, system, equipment and medium for preserving the repeated low-voltage crossing characteristic of new energy, so as to solve the problems that the simulation efficiency is low, the analysis time is long, and the repeated low-voltage crossing characteristic of the new energy cannot be accurately preserved. The method comprises the following steps: taking a new energy collection bus as a starting point, and carrying out graded section division on a power transmission line of a power grid; based on the section division result, calculating the sensitivity to the short-circuit ratio of the new energy collection bus after each line in each section is cut off; determining an internal system, an external system and a boundary node connecting the internal system and the external system based on the sensitivity result; carrying out equivalence on an external system through a multi-port Thevenin equivalence method; and determining a final equivalent power grid according to the consistency of the new energy repeated low-voltage penetration condition of the system before and after equivalence under the disconnection fault. According to the method, on the premise of ensuring that the simulation precision reaches the standard, the analysis efficiency of the new energy repeated low-pass characteristics is improved.

A multi-port memory cell has a write-only cell and a buffered read port. The write-only cell has cross-coupled inverters and transmission gates to write bit lines. Each transmission gate has n-channel and p-channel transistors in parallel that both turn on during writing but remain off for reading. A node in the cross-coupled inverters is applied to a gate of a buffer transistor that has a channel in series with a channel of a read pass transistor to a read bit line. The buffered read port can be an inverter and a transmission gate, or can have p-channel and n-channel buffer and pass transistors in a four-transistor stack. The number of p-channel and n-channel transistors can be equal for use in a standard-cell or macro library layout, and the standard-cell logic power supply can be used for the memory cells even for ultra-low supply voltages.

Methods, systems, and devices for wireless communications are described. In some examples, a transmitting device associated with one or more non-coherent demodulation reference signal ports may transmit data including a phase change estimation reference signal with multiple reference signal groups. In some examples, multiple different phase change estimation reference signal ports may be code-division multiplexed to transmit the phase change estimation reference signal in the same set of reference signal groups using a different orthogonal cover code for each phase change estimation reference signal port. In some other examples, the different phase change estimation reference signal ports may be used for transmitting the phase change estimation reference signal in the different time-division multiplexed sets of reference signal groups. In such cases, by assigning two phase change estimation reference signal ports to two TDM sets, the two phase change estimation reference signal ports may be time-division multiplexed.

Disclosed is a multi-port charger capable of charging a higher-voltage battery by boosting low DC charging voltage using an on-board charger (OBC) installed in a vehicle without adding a separate part or device and capable of being used for various applications, such as V2G and V2L, in addition to charging.

The invention provides a calibration piece and a calibration method for a multi-port waveguide antenna test system, and a test method and a test system for a multi-port waveguide antenna, in the calibration piece, a positioning structure can ensure the repeatability of each connection, which is the premise of high-precision calibration, and the calibration accuracy is greatly improved. The load unit, the offset short circuit unit and the offset load unit are provided with a plurality of waveguide ports which are the same as those of a tested piece and can be directly butted, the internal structure of the waveguide port of the load unit is an antenna, electromagnetic wave energy can be radiated out instead of being absorbed internally, and high precision and stability of the load standard are guaranteed; according to the method, the reference surface can be determined at the interface of the tested piece, the calibration error model can be directly tested on the reference surface, the accuracy is good, and the solved calibration error model contains all time-varying characteristics of the whole test link during each calibration, so that the method can be used for frequently calibrating according to requirements, and the calibration accuracy is high. Measurement errors caused by temperature drift and link loss can be handled, and the efficiency is high.

The invention discloses a multi-port DAB energy storage system directly connected with an elevator frequency converter bus and a cooperative control method of the multi-port DAB energy storage system, and is suitable for an elevator frequency converter direct-current bus direct-connection scene. Aiming at the defects in the aspects of elevator bus transient support, multi-branch extension and parallel operation safety access in the prior art, at least two DAB power branches are adopted, the low-voltage sides of the DAB power branches are connected into the same low-voltage direct-current source in parallel to realize current expansion, and the high-voltage sides of the DAB power branches are connected to a VFD direct-current bus through a parallel operation access switch to realize voltage expansion after being connected in series and laminated; the controller adopts fixed frequency phase shift control, and combines a two-line parallel operation or power-off time sequence and a zero-crossing residence strategy; through multi-branch phase interleaving, mutual exclusion amplitude limiting constraint, ZVS guarantee and a fault striding linkage mechanism, branch power balance, circulating current suppression and bus stable support are realized. According to the invention, the millisecond voltage of the bus can be efficiently suppressed, the response speed, the operation efficiency and the reliability of the system are improved, and the core requirements of elevator bus energy recovery and transient stability control are met.

The invention discloses a battery charging control method for a multi-port topology energy storage system, a processor, the multi-port topology energy storage system and a machine readable storage medium of the multi-port topology energy storage system, and relates to the technical field of battery energy storage optimization control. The method comprises the following steps: determining an internal resistance stable quantized value of each battery monomer in a preset period according to internal resistance fluctuation data of the battery monomer, and determining a temperature rise quantized value of the battery monomer in the preset period according to temperature change data of the battery monomer; the charging performance of each single battery is determined according to the internal resistance stable quantized value and the temperature rise quantized value of each single battery, the internal resistance stable quantized value is in positive correlation with the charging performance, and the temperature rise quantized value is in negative correlation with the charging performance; and distributing the current total power generation power of the plurality of power generation ports to each battery monomer according to the charging performance of the battery monomers of the plurality of power storage ports. According to the method, the current total power generation power of the plurality of power generation ports can be distributed more reasonably.

The invention discloses an intelligent soft switching and multilayer electro-hydrogen hybrid energy storage two-stage space-time decoupling configuration method and system. The method comprises the following steps: inputting basic data and initializing network basic parameters; in the first stage of constructing the two-stage MEH-SOP model, the power / capacity of each device of the MEH is optimally configured on the basis of annual 8760h time sequence operation simulation considering time-of-use electricity price; constructing a second stage of the two-stage MEH-SOP model, extracting typical scenes of MEH full-year high-power charging / discharging and power distribution network full-year voltage serious out-of-limit, and optimally configuring SOP multi-port capacity; and solving the constructed two-stage MEH-SOP model, and outputting an optimal configuration result. According to the invention, a multi-level energy storage system covering from the day to the week is constructed, and the multi-port SOP direct current side is connected in a modularized manner, so that the structural flexibility and the operation flexibility of the power distribution network are remarkably enhanced.

The invention discloses a power supply quality evaluation method and system for a source network load storage multi-port system and a medium, and the method comprises the steps: obtaining monitoring data of the source network load storage multi-port system, and calculating a system operation performance evaluation index based on a preset system operation evaluation model according to the monitoring data; constructing a system scoring model according to the system operation performance evaluation indexes; the system scoring model comprises an index score of each system operation performance evaluation index; calculating the power grid strength based on the real-time monitoring data; according to the power grid strength, determining each index weight coefficient of the system under each power grid strength grade; calculating an operation quality comprehensive score according to the index score and the weight coefficient of each index of the system; and according to the comprehensive score of the operation quality, obtaining a final grade of the operation quality of the source network load storage multi-port system. According to the method, the overall performance evaluation of the system can be realized by adaptively adjusting the weight based on the power grid strength, and the system operation is optimized on the basis, so that the safe and efficient system operation is realized.

Systems, methods, and apparatuses disclosed herein can enable a computing system to connect to a network. These systems, methods, and apparatuses can connect the computing system to the network through multiple network connections. These multiple network connections represent distinct, physically separate signal pathways to improve security. This physical separation, or isolation, from one another creates distinct boundaries between these multiple network connections, for example, to minimize shared resources these systems, methods, and apparatuses. These distinct boundaries can reduce the vulnerability of these systems, methods, and apparatuses to, for example, attacks that exploit shared sources among these systems, methods, and apparatuses, data leakage within these systems, methods, and apparatuses, and / or unauthorized access to these systems, methods, and apparatuses. Moreover, these distinct boundaries can additionally enhance security by improving fault isolation, enforcing access control, and / or supporting secure communication protocols, among others, within these systems, methods, and apparatuses.

The invention relates to the technical field of medical marketing data sharing, in particular to a medical marketing data sharing method and system based on a block chain, and the method comprises the steps: compiling a plaintext description of a medical marketing business rule into an arithmetic circuit with a multi-port structure, generating a verification key, and deploying the verification key in a block chain smart contract in the block chain; the verification node initiates a verification request containing a data type, a service rule identifier and a time period identifier; the medicine enterprise node and the medical institution node respectively load the local privacy data to the input port and generate a corresponding first zero-knowledge proof and a corresponding second zero-knowledge proof; and the verification smart contract loads a verification key according to the time period identifier to carry out cooperative verification on the two zero-knowledge certificates and generates a conclusion for uplink storage. According to the method, cross-subject association verification is realized on the premise of not converging original data, and the accuracy and auditing performance of compliance judgment are improved through a time period self-adaptive threshold value.

The invention discloses an optical storage charging-UPQC multi-port cycle calendar life cost collaborative energy management method, and belongs to the technical field of electric energy quality management and optical energy storage collaborative control of a power distribution and utilization system. The invention aims to provide a light storage and charging-UPQC multi-port cycle calendar life cost collaborative energy management method which introduces a photovoltaic flexible power regulation and'cycle + calendar 'combined life modeling mechanism and embeds energy storage life cost into a model predictive control (MPC) framework on the premise that UPQC undertakes power quality compensation. According to the invention, a model predictive control (MPC) framework is adopted to carry out cooperative energy management on photovoltaic flexible output, energy storage power distribution and charging load limit, and when the SOC approaches a boundary, photovoltaic load reduction and power change rate limitation are automatically triggered. According to the method, energy storage deep circulation and excessive loss can be actively inhibited while the energy balance of the direct-current bus is maintained, and the comprehensive targets of electric energy quality treatment, energy stabilization and energy storage life protection are achieved.

The invention belongs to the technical field of power system operation and control, and particularly provides a microgrid distributed robust optimization scheduling method considering source load uncertainty and electricity-hydrogen-carbon coupling. Comprising the following steps: constructing an electricity-hydrogen-carbon-heat four-dimensional collaborative micro-grid energy flow framework comprising a multi-port alternating current and direct current bus, a hydrogen production storage and transportation subsystem, a carbon capture methanation subsystem and a cross-stage thermodynamic energy cascade network; establishing an IGDT-based source-load bilateral uncertainty dynamic pricing model, and selecting a risk avoidance or opportunity seeking pricing model as required; a multi-agent game double-layer interaction model with a micro-grid operator as a leader and a load aggregator and a charging station as followers is constructed, and a nested part can observe a Markov decision process; and a privacy protection multi-agent deep reinforcement learning algorithm in which a maximum entropy framework and a CTDE mechanism are introduced is adopted for solving. According to the method, the problem of low-carbon operation of the micro-grid in a source load uncertainty environment is solved, and collaborative improvement of economical efficiency, low-carbon performance and robustness is realized.

The application discloses a kind of test system and method of radio frequency module, belong to product test technical field.System includes: multiple host computers respectively control multiple test equipment on multiple radio frequency modules to be tested placed and open radio frequency test mode;Multiple-port radio frequency test instrument is detected by multiple test ports respectively multiple radio frequency modules in radio frequency test mode The radio frequency data generated by multiple radio frequency modules, and multiple radio frequency data generated by multiple radio frequency modules are sent to multiple host computers respectively;Multiple host computers according to multiple radio frequency data generated by multiple radio frequency modules, multiple test information corresponding to multiple radio frequency modules are sent to server device;Server device generates multiple radio frequency module placement instruction according to multiple test information, and sends multiple radio frequency module placement instruction to pick-and-place device;Pick-and-place device according to multiple radio frequency module placement instruction, multiple radio frequency modules are classified and placed, multiple radio frequency modules are realized parallel automated test, and test efficiency is improved.

The invention discloses a multi-port hybrid charging pile power pool reinforcement learning scheduling method and system, and relates to the technical field of computer data processing. The reinforcement learning scheduling method and system for the multi-port hybrid charging pile power pool comprises the following steps: S1, periodically collecting port scheduling data, and preprocessing the port scheduling data; s2, constructing and training a vehicle target SOC prediction model, outputting a vehicle target SOC, evaluating charging urgency of each accessed vehicle, and dividing scheduling priority levels; s3, constructing a port power distribution model, outputting a power distribution value of each charging port, and issuing the power distribution value to a power control interface for execution; and S4, evaluating power scheduling execution deviation, and entering a protection mode when evaluation is abnormal. The problems that the total power of the charging pile cannot be flexibly scheduled due to fixed-proportion power distribution and topological isolation of alternating-current and direct-current ports, high-power resources are occupied by high-electric-quantity vehicles, and charging of low-electric-quantity vehicles is limited are solved.

The invention relates to a multi-port electric energy router control method and device based on an MMC. The method comprises the following steps: for a five-port electric energy router based on a double-end back-to-back modular multilevel converter (MMC), connecting a middle-low voltage direct current bus by adopting an input-series output-parallel dual active bridge converter structure, and realizing module power balance of each port through input voltage balance control; in a network-following type control link of a double-end back-to-back modular multilevel converter (MMC), virtual synchronous generator control (VSG) is applied to a grid-connected power control port of the MMC, and virtual direct current motor control (VDMC) is applied to an energy storage port of the MMC; and determining an operation mode based on the power grid short-circuit ratio, and carrying out network following / network construction control switching on the MMC-based multi-port electric energy router under the strong / weak power grid condition. Through the control mode, the multi-port electric energy router can ensure the stability of direct current voltage and the balance of supply and demand of power under complex working conditions.

A multi-port flexible interconnection device for distribution networks, and a control method and system thereof are provided. The multi-port flexible interconnection device includes a bipolar output inverter and a multi-port flexible interconnection module connected in series therewith. The multi-port flexible interconnection module includes multiple unipolar output inverters which share the same common connection bus and are connected in parallel, and AC output ports of each unipolar output inverter are interconnected with different feeders. By adjusting an AC output voltage in series between the feeders, active and reactive power decoupling control for each feeder is achieved. Energy balance for the entire device and its components is maintained by controlling an internal circulating current of the bipolar output inverter. The provided introduces the multi-port flexible interconnection module to interconnect multiple feeders in a distribution network, enabling flexible power interchange between feeders and facilitating a flexible AC distribution network featuring multi-terminal interconnection.

The invention discloses a hierarchical step-by-step multi-target genetic optimization method for a multi-port composite magnetic flux modulation motor. The method comprises the following steps: determining a basic topological structure of the motor and completing a preliminary topological design; constructing a parameterized model of the multi-port composite magnetic flux modulation motor, and screening all variables possibly influencing the performance of the motor; defining an optimization target and related constraint conditions of the multi-port composite magnetic flux modulation motor, and selecting performance target parameters sensitive to a power transmission system of the hybrid electric vehicle; on the basis of analysis of multiple operation conditions of the motor, in order to ensure that optimization can be realized under all the operation conditions, a step-by-step optimization method is adopted for the multi-port composite magnetic flux modulation motor, and an optimization result of the previous step is used as an initial scheme of the next step; and drawing a Pareto curve optimized in each step, and screening out an optimal topological structure from the curve as an optimization result. The invention provides a simpler and more convenient and high-precision optimization strategy for the multi-port composite motor.

The invention provides an operation control method and device for a distributed energy power generation system, and belongs to the technical field of energy power generation, and the method comprises the steps: obtaining an environment parameter in a preset time, a first electrical parameter of the distributed energy power generation system, and a second electrical parameter of load equipment; inputting the parameters into the three-dimensional dynamic digital twin, and obtaining an influence source of voltage fluctuation, a sensitive node of the voltage fluctuation and an influence level corresponding to the sensitive node according to a simulation result; adjusting the duty ratio of each port of the multi-port solid-state transformer based on the influence source of the voltage fluctuation, the sensitive node of the voltage fluctuation and the influence level corresponding to the sensitive node; and regulating and controlling the operation state of the distributed energy power generation system based on the duty ratio of each port of the multi-port solid-state transformer. According to the invention, when the voltage fluctuates, the duty ratio of each port can be rapidly adjusted, the voltage is kept stable, and the power utilization safety of the load is ensured.

The invention relates to the technical field of power distribution, and discloses a POE modular switch power distribution method and device and computer equipment, and the method comprises the steps: collecting a port power consumption data set of a POE modular switch; performing inter-port power consumption correlation modeling based on the port power consumption data set to obtain a dynamic load model; performing multi-standard handshake protocol analysis and power consumption prediction on the access equipment according to the dynamic load model to obtain an equipment power consumption prediction result; performing fast weight allocation based on the equipment power consumption prediction result to obtain a port power allocation scheme; and performing multi-port aggregation and power pooling management on the high-power demand ports according to the port power distribution scheme, and generating a power rerouting control instruction, thereby effectively solving the technical problems of low power utilization rate and non-uniform power supply of the traditional static distribution method, and remarkably improving the power management efficiency of the whole system.

The present disclosure provides techniques for using a multiple-port buffer to improve a transaction rate of a memory module. In an example, a memory module can include a circuit board having an external interface, first memory devices mounted to the circuit board, and a first multiple-port buffer circuit mounted to the circuit board. The first multiple-port buffer circuit can include a first port coupled to data lines of the external interface, the first port configured to operate at a first transaction rate, a second port coupled to data lines of a first plurality of the first memory devices, and a third port coupled to data lines of a second plurality of the first memory devices. The second and third ports can be configured to operate at a second transaction rate, wherein the second transaction rate is slower than the first transaction rate.