Patent ID: 6509988
Filing Date: 2003-01-21
Classification: H04B,H04L

Abstract:
A physical layer interface for an IEEE-1394 serial bus node, comprising:a plurality of port transceivers connected to respective serial buses and capable of operating at different maximum speeds; a controller connected to a link layer and said port transceivers; an encoder/decoder respective to a control signal from said controller for performing data conversion between the link layer and said port transceivers; a repeater responsive to a control signal from said controller for repeating bus traffic between said port transceivers; a register having a plurality of entries respectively corresponding to said port transceivers, each of the entries including a first field for storing a specified value and a second field for storing the maximum operating speed of the corresponding port transceiver; and a speed setting circuit for setting a lowest transmission speed value in the first field of one of said entries of the register as said specified value, said controller reading the specified value stored in said register and determining the lowest of the maximum operating speeds of said plurality of port transceivers as an operating speed of said IEEE-1394 serial bus node.