Coding apparatus, coding method, data communication apparatus, and data communication method

摘要

A 4B5B encoder converts an inputted 4-bit data into a pattern of a 5-bit data in which (i) the number of bits of consecutive “0” data values is permitted to be maximum two, and, simultaneously, (ii) maximum one bit of head end two bits is permitted to have a “0” data value and maximum one bit of tail end two bits is permitted to have a “0” data value. A 5N-bit command encoder converts a command into a command pattern in which the number of bits contained in consecutive “0” data values is permitted to be maximum two. The data after the conversion and the command after the conversion are converted into NRZI codes by an NRZI encoder.

主权项

1. A coding apparatus comprising:
a data conversion device to perform a conversion of a 4-bit data having a 4-bit string into a 5-bit data pattern having a 5-bit string; a command conversion device to perform a conversion of a command into a 5N-bit command pattern having a 5N-bit string, wherein the N is a natural number that is two or more; and an NRZI conversion device to perform a conversion of the 5-bit data pattern and the 5N-bit command pattern into NRZI codes to allow clock extraction at a receiver, wherein the NRZI signifies No Return to Zero/Invert on ones, wherein: the data conversion device performs the conversion into the 5-bit data pattern having the 5-bit string in which
(i) a number of bits of consecutive “0” data values is permitted to be maximum two, and, simultaneously,(ii) maximum one bit of head end two bits is permitted to have a “0” data value and maximum one bit of tail end two bits is permitted to have a “0” data value; the command conversion device performs the conversion into the 5N-bit command pattern having the 5N-bit string having N 5-bit patterns,
the N 5-bit patterns including one 5-bit pattern in whicha maximum number of bits of consecutive “0” data values is two and the consecutive two “0” data values are only positioned in either (a) head end two bits of the one 5-bit pattern or (b) tail end two bits of the one 5-bit pattern, in an entity of the 5N-bit string having N 5-bit patterns,
(i) a number of bits contained in consecutive “0” data values is permitted to be a maximum two that are neither positioned in head end two bits of the 5N-bit string nor tail end two bits of the 5N-bit string, and, simultaneously,(ii) maximum one bit of the head end two bits is permitted to have a “0” data value and maximum one bit of the tail end two bits is permitted to have a “0” data value.