Communication device performing code conversion between binary data and serial data

• US 5,684,479 A
• Filed: 07/26/1995
• Issued: 11/04/1997
• Est. Priority Date: 07/29/1994
• Status: Expired due to Fees

• Current Assignee: Okuma Corporation
• Original Assignee: Okuma Corporation
• Inventors: Hayashi, Yasukazu
• Primary Examiner(s): Hoff, Marc S.
• Application Number:
  US08/507,523
• Time in Patent Office: 832 Days
• Field of Search: 341/58, 341/59, 341/95, 341/102
• US Class Current: 341/102
• CPC Class Codes: H04L 25/4904 using self-synchronising codes, e.g. split-phase codes
• CPC Class Codes: H04L 25/4908 using mBnB codes

Abstract

A communication device assuring reliable and effective data transfer. Receiving a signal from a transmit timing generator, a communication control circuit sequentially transfers block data in RAM to an encoder. In response to a control signal from the communication control circuit, the encoder outputs a communication control signal, which comprises 6 bits of 0 and 6 bits of 1 and is indicative of the start of communication data, converting 8-bit parallel data (received from the RAM) into a 12-bit code comprising 6 bits of 0 and 6 bits of 1, and outputting a communication control signal indicative of the end of the communication data. The signals from the encoder are outputted as a serial signal, (which is free from any DC component) from a shift register and a driver.

Claims

1. A communication device for transmitting a frame generated by converting a block of binary data into serial data, said communication device comprising an encoder encoding every N bits of binary data, where (N≧

4), into 2·

M-bit serial data including M bits of 0 and M bits of 1, wherein M is (M<

N, 2 N<

(2M)|/(M|)

     2);

wherein the encoder converts every 4 bits of the binary data into 6-bit serial data having 3 bits of 0 and 3 bits of 1, and the serial data does not have 3 or more consecutive bits of the same value at the start and end of a bit pattern.

2. A communication device for transmitting a frame generated by converting a block of binary data into serial data, said communication device comprising an encoder encoding every N bits of binary data, where (N≧

4 , into 2·

M-bit serial data including M bits of 0 and M bits of 1, where M is (M<

N, 2 N<

(2M)|/(M|)

     2);

wherein the encoder converts a communication control signal contained in the frame into 2·

M-bit serial data which includes M bits of 0 and M bits of 1 and has a pattern different from a pattern of the converted binary data, and the encoder further converts every 8 bits of the binary data into 12-bit serial data having 6 bits of 0 and 6 bits of 1, and converts the communication control signal into a 12-bit code which includes 6 bits of 0 and 6 bits of 1, and has a pattern different from a pattern of the converted binary data.

3. The communication device as in claim 2, wherein the encoder encodes binary data as a communication signal into a code having 5 or more consecutive bits of the same value.