Method of encoding and synchronizing a serial interface
View Patent ↗The present disclosure is generally directed to a method of communicating data between two or more semiconductor devices. Serial interfaces using the method have a reduction in latency compared to conventional serial interfaces. The method enables features needed for a serial interface, such as limited run lengths and recognizable data boundaries to establish alignment. In addition, a method for synchronizing two or more semiconductor devices through serial interfaces has been presented. This is done by passing a marker data pattern through the system.
1. A method of producing encoded data for communication over a serial interface, the method comprising:
receiving an input data stream including a plurality of nine-bit data blocks;
partitioning each of the plurality of nine-bit data blocks into a first sub-block comprising one bit, a header, and a byte that includes a second sub-block of eight bits;
for periodically selected headers, encoding the header to create a two-bit frame header comprising the header and a copy of the header;
for other headers, encoding the header to create a two-bit transition header comprising the header and the inverse of the header;
for each of the bytes, encoding the byte to create an encoded byte that includes an eight-bit encoded sub-block;
creating an output data stream that includes a plurality of data segments, each of the plurality of data segments including:
one of the frame headers or one of the transition headers; and
one of the encoded bytes;
wherein each of the data segments comprises ten bits; and
communicating the output data stream over one or more serial interfaces.
2. The method of claim 1 , wherein a periodic selection associated with the periodically selected headers is based on a period of N, wherein N is equal to 128.
3. The method of claim 1 , wherein each of the bytes is encoded using a data scrambler.
4. The method of claim 3 , wherein the data scrambler is a recoverable scrambler based on a polynomial.
5. The method of claim 1 , wherein the transition headers and frame headers identify corresponding ten-bit boundaries, and wherein only the frame headers identify N*10-bit boundaries.
6. A plurality of serial interfaces using the method of claim 1 to encode data streams including data sent across the serial interfaces, wherein corresponding frame headers in the data streams are used to align the data streams to each other.
7. The method of claim 1 , wherein a first subset of the plurality of data segments forms a synchronization marker data pattern and a second subset of the plurality of data segments forms a second synchronization marker data pattern.