Adaptations for partial response summation node embedded FPGA transceiver
Systems and methods are described that include adaptation circuitry for processing a data signal. The adaptation circuitry may include summation node circuitry for processing an error value associated with the data signal. The adaptation circuitry may also include adaptation engine circuitry, coupled to the summation node circuitry, for controlling the operation of the summation node circuitry.
1. Adaptation circuitry for processing a data signal, the adaptation circuitry comprising:
a data slicing level (dLev) Digital-to-Analog Convertor (DAC) for outputting a predicted dLev value associated with the data signal;
summation node circuitry, coupled to the dLev DAC, for processing an error value associated with the data signal based on the predicted dLev value; and
adaptation engine circuitry, coupled to the summation node circuitry, for controlling an operation of the summation node circuitry.
2. The adaptation circuitry of claim 1 , wherein the adaptation engine implements a Sign-Sign Least-Mean Square (LMS) technique.
3. The adaptation circuitry of claim 1 , wherein the VGA is controlled by the adaptation engine circuitry, and wherein the VGA is used to apply a gain to the data signal.
4. The adaptation circuitry of claim 1 , wherein the error value is associated with a data slicing level (dLev) value.
5. The adaptation circuitry of claim 1 , wherein the summation node circuitry is partial response summation node circuitry to enable the adaptation engine circuitry to statistically filter the data signal.
6. The adaptation circuitry of claim 1 , wherein the summation node circuitry includes only two sense amplifiers.
7. The adaptation circuitry of claim 1 , wherein the adaptation circuitry is used to determine the dLev value associated with the data signal.
8. The controller of claim 1 , wherein the adaptation circuitry is used to determine an optimal amplitude for the data signal.
9. Receiver circuitry for receiving a data signal, the receiver circuitry comprising:
a data slicing level (dLev) Digital-to-Analog Convertor (DAC) for outputting a predicted dLev value associated with the data signal;
partial response summation node circuitry, coupled to the dLev DAC, for processing an error value associated with the data signal based on the predicted dLev value; and
adaptation engine circuitry, coupled to the partial response summation node circuitry, for controlling an operation of the partial response summation node circuitry.
10. The receiver circuitry of claim 9 , wherein the adaptation engine implements a Sign-Sign Least-Mean Square (LMS) technique.
11. The receiver circuitry of claim 9 , wherein the VGA is controlled by the adaptation engine circuitry, and wherein the VGA is used to apply a gain to the data signal.
12. The receiver circuitry of claim 9 , wherein the partial response summation node circuitry enables the adaptation engine circuitry to statistically filter the data signal.
13. The receiver circuitry of claim 9 further comprising decision feedback equalizer (DFE) circuitry operating in parallel with the partial response summation node circuitry.
14. The receiver circuitry of claim 9 , wherein the partial response summation node circuitry includes only two sense amplifiers.
15. The receiver circuitry of claim 9 , wherein the receiver circuitry is used to determine a data the dLev value associated with the data signal.
16. The receiver circuitry of claim 9 , wherein the receiver circuitry is used to determine an optimal amplitude for the data signal.
17. A method for adapting a received data signal using adaptation circuitry, the method comprising:
setting a variable gain amplifier (VGA) to apply a first gain to the received data signal;
outputting a predicted data slicing level (dLev) value associated with the received data signal using a dLev Digital-to-Analog Convertor (DAC);
accumulating a number of errors associated with 10 the received data signal using summation node circuitry and adaptation engine circuitry based on the predicted dLev value; and
when the number of errors fails to meet a pre-defined threshold, setting the VGA to apply a second gain to 15 the received data signal using the adaptation engine circuitry.
18. The method of claim 17 , wherein the second gain is larger than the first gain.
19. The method of claim 17 , wherein the accumulating comprises using the summation node circuitry to enable the adaptation engine circuitry to statistically filter the received data signal.