Communication module outputting a copy of a register of a retimer to a host device
A technology of communication modules and registers, which is applied in the direction of instruments, transmission systems, digital transmission systems, etc., and can solve the problems of high cost and large installation area
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Embodiment 1
[0017] 1 is a block diagram showing a schematic configuration of a communication system including a 10Gb Ethernet (R) communication module (hereinafter referred to as a communication module) according to Embodiment 1 of the present invention. This communication system includes a communication module 12 and a MAC layer 1 that collectively manages the communication module 12 . Although only one communication module is described in FIG. 1 , a communication system includes a plurality of communication modules having the same configuration, and the MAC layer 1 collectively manages these communication modules.
[0018] The MAC layer 1 includes an MDIO host 2 that controls a communication module via a serial bus (MDIO bus) 8 .
[0019] The communication module 12 includes a microcomputer 3 for overall control of the communication module 12 connected to the MAC layer 1; the XAUI retimer 9 for controlling the communication physical layer in the communication module 12. Microcomputer 3...
Embodiment 2
[0035] Fig. 3 is a block diagram showing a schematic configuration of a communication system including a communication module according to Embodiment 2 of the present invention. Compared with the communication module of the first embodiment shown in FIG. 1 , the difference is that two microcomputers 3 are provided. The reference numerals of the two microcomputers of this embodiment will be described as 3A and 3B.
[0036] Microcomputer 3A includes MDIO interface 4A connected to MDIO host 2 in MAC layer 1, SRAM 5A, and flash ROM 7A. The SRAM 5A includes an IEEE dummy register 6A holding the contents of the IEEE register 10 . The flash ROM 7A stores programs executed by the microcomputer 3A, initial values of IEEE registers, and the like. In addition, the SRAM 5A may be another random-access high-speed storage medium, and the flash ROM 7A may be another nonvolatile memory capable of retaining data even when the communication module 12 is powered off.
[0037] Microcomputer ...
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