Broadcom Corporation

Daniel Tai

James Battle

Mohan V Kalkunte

Srinivas Sampath

Kevin Cameron

Soma Pullela

Meg Pei Lin

Wei (David) Wang

According to one example embodiment, an apparatus may include a media-side physical layer (PHY) block configured to receive a received signal via at least one medium, decode the received signal into data, and send the data to a media-side medium access control (MAC) block, the media-side MAC block configured to receive the data from the media-side PHY layer block, determine a time of receipt of the data, prevent a system-side MAC block from forwarding the data until a predetermined delay after the time of receipt, perform MAC functions on the data, and send the data to the system-side MAC block, the system-side MAC block configured to receive the data and the control time from the media-side MAC block and send the data to a system-side PHY block after the predetermined delay based on signals received from the media-side MAC block, and the system-side PHY block configured to receive the data from the system-side MAC block, encode the data into a transmitted signal, and transmit the transmitted signal to a computing system.

Physical layer device with dual medium access controller path

A media access control (MAC) security (MACsec) function block may implement MACsec protocols on a network. A physical layer device (PHY) may connect to the MACsec function block and an interface register configured to store command information for the MACsec function block. A central processing unit (CPU) may provide the command information for the MACsec function block to the PHY via a management data input/output (MDIO) bus. The PHY may execute either a read command or a write command against the MACsec function block based on the command information, receive, from the MACsec function block, a response corresponding to the execution of the read command or write command against the MACsec function block, and provide the response to the CPU via the MDIO bus.

Media access control security management in physical layer

A method for controlling a flow of packet data in a memory management unit of a network switch fabric is disclosed. A first portion of a data packet is received at a port on an ingress bus ring of the network switch fabric. A class of service for the data packet is determined based on the first portion and the portion is stored in a packer RAM of the port based on the class of service. Subsequent portions of the data packet are stored in the packer RAM. Once the predetermined number of portions have been received, the predetermined number of portions is sent to a packet pool RAM. A reference pointer to a first predetermined number of portions is sent to a transaction queue once an end of packet is detected and an egress scheduler detects a presence of a ready packet in the transaction queue and notifies an unpacker of the ready packet. The unpacker puts the ready packet into a FIFO and the ready packet is sent to an ingress/egress module.

Switch fabric with memory management unit for improved flow control

A memory management unit (MMU) for a network switch fabric for forwarding data is disclosed. The MMU has an ingress port interface receiving portions of a data packet and an egress port interface, connected to ingress ports of the fabric through an ingress bus ring. The MMU also includes a cell packer, that groups packet data into cells and a packet pool memory, that stores cells received from the cell packer. The MMU also includes a cell unpacker, where the cell unpacker separates stored cells before releasing the cells to an egress port. The MMU also includes an egress scheduler communicating with the cell unpacker, where the egress scheduler determines which packet data should be retrieved from the packet pool memory according to priority rules. The priority rules can be a deficit round robin scheduling algorithm or a weighted round robin scheduling algorithm.

Memory management unit architecture for switch fabric

A method of forwarding data in a network switch fabric is disclosed. An incoming data packet is received at a first port of the fabric and a first packet portion, less than a full packet length, is read to determine particular packet information, the particular packet information including a source address and a destination address. An egress port bitmap is determined based on a lookup in a forwarding table and it is determined if the destination address belongs to a trunk group of trunked ports. The incoming data packet is forwarded based on the egress port bitmap, when the destination address does not belong to the trunk group. When the destination address does belong to the trunk group, a particular trunked port of the trunk group is determined and the incoming data packet is forwarded thereto. More specifically, the particular trunked port of the trunk group may be determined by calculating a hash value based on the source address and the destination value and selecting the particular trunked port based on the hash value. Additionally, a class of service for the incoming data packet is also determined from the particular packet information and a priority for forwarding is set based on the class of service.

Growing community of inventors

Sunnyvale, CA, United States of America

Daniel Tai