| 摘要 |
A system includes a serial bus 330, at least a first portion of which is formed on a circuit board. A first physical layer controller 322 is coupled to the first portion of serial bus 330. This physical layer controller 322 includes a register set with a plurality of eight-bit registers addressable by four-bit addresses. In this device, at least one of the seventh or eighth bits of the 0010 register is permanently programmed with a logical "1". This physical layer controller is also backward compatible with a physical layer controller that conforms with IEEE-Std-1394-1995. The system also includes another physical layer controller 324, which may or may not be the same as physical layer controller 322, link layer controllers 314 and 316 and at least one processor (or controller) 310.
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