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Method and apparatus for encoding multiple bits on a signal wire by transmitting pulses during a framing window

IP.com Disclosure Number: IPCOM000008009D
Publication Date: 2002-May-10
Document File: 3 page(s) / 38K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method and apparatus for encoding multiple bits on a signal wire by transmitting pulses during a framing window. Benefits include improved performance.

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Method and apparatus for encoding multiple bits on a signal wire by transmitting pulses during a framing window

Disclosed is a method and apparatus for encoding multiple bits on a signal wire by transmitting pulses during a framing window. Benefits include improved performance.

Description

              The disclosed method is encodes multiple bits of information into pulses that are sampled during a framing window. The number of pulses received during the frame time corresponds to a symbol. This symbol is then used as a key to decode the information encoded. 

              A pulse is required to be contained in a frame window (see Figure 1). The frame window, fw, is generated from a free-running clock where the edges make the frame or are asserted when valid pulses are to be received. The pulses are of width pw, but not all pulses are required to be the same duration. The spacing between pulses, d, also does not have to be constant between pulses. 

              Two different encoding schemes can be utilized, implicit and explicit (see Figure 2). The implicit encoding requires one less pulse than the explicit coding as symbol s1 requires no pulses to be received during the frame. Given each encoding scheme, the following equations can be realized, assuming binary symbols, where the value a is the number of pulses needed to represent N unique symbols.:

                            ; Explicit pulse count (pulse count ¹ 0)          

              ; Implicit pulse count (no pulses = “00”)

              The value fw is the minimum size the fame window needs to be to send a pulses all of...