System for phase tracking and equalization across a byte group for asymmetric control of high-speed bidirectional signaling

1. A system comprising:

a slave device; and

a master device coupled to the slave device via a plurality of bidirectional data paths;

wherein the master device is configured to adaptively modify transmit characteristics based upon data eye information sent via one or more unidirectional data paths by the slave device, wherein the data eye information corresponds to an edge position of data signal transitions received by the slave device on each data path of the plurality of bidirectional data paths; and

wherein the master device is further configured to modify data path equalization coefficients within the master device for a grouping of data paths of the bidirectional data paths dependent upon the data eye information; and

wherein the master device is further configured to adaptively modify transmit characteristics based upon cyclic redundancy code (CRC) information sent via the one or more unidirectional data paths, wherein the CRC information corresponds to data sent by the master device via the plurality of bidirectional data paths.

2. The system as recited in claim 1 , wherein the master device is further configured to adaptively modify the data path equalization coefficients within the master device for the grouping of data paths of the bidirectional data paths dependent upon an average of the data eye information across the grouping.

3. The system as recited in claim 1 , wherein the master device is further configured to adaptively modify a phase alignment of data transmitted by the master device via the grouping of data paths of the plurality of bidirectional data paths dependent upon the data eye information.

4. The system as recited in claim 1 , wherein the master device is further configured to adaptively modify a phase alignment of data transmitted by the master device via the grouping of data paths of the plurality of bidirectional data paths dependent upon an average of the data eye information across the grouping.

5. The system as recited in claim 1 , wherein the master device is further configured to adaptively modify a phase alignment of data transmitted by the master device independently for each data path of the plurality of bidirectional data paths dependent upon the data eye information.

6. The system as recited in claim 1 , wherein the master device is further configured to transmit a predetermined pattern to the slave device and to adaptively modify data path equalization coefficients within the master device for the grouping of data paths of the plurality of bidirectional data paths based upon the corresponding data eye information.

7. A method comprising:

a master device controlling data transfer between the master device and a slave device;

the master device adaptively modifying transmit characteristics based upon data eye information sent via one or more unidirectional data paths by the slave device, wherein the data eye information corresponds to an edge position of data signal transitions received by the slave device on each data path of a plurality of bidirectional data paths;

the master device modifying data path equalization coefficients within the master device for a grouping of data paths of the bidirectional data paths dependent upon the data eye information; and

the master device adaptively modifying transmit characteristics based upon cyclic redundancy code (CRC) information sent via the one or more unidirectional data paths, wherein the CRC information corresponds to data sent by the master device via the plurality of bidirectional data paths.

8. The method as recited in claim 7 , further comprising the master device adaptively modifying data path equalization coefficients within the master device for a grouping of data paths of the bidirectional data paths dependent upon an average of the data eye information across the grouping.

9. The method as recited in claim 7 , further comprising the master device modifying a phase alignment of data transmitted by the master device via the grouping of data paths of the plurality of bidirectional data paths dependent upon the data eye information.

10. The method as recited in claim 7 , further comprising the master device modifying a phase alignment of data transmitted by the master device via the grouping of data paths of the plurality of bidirectional data paths dependent upon an average of the data eye information across the grouping.

11. The method as recited in claim 7 , further comprising the master device modifying a phase alignment of data transmitted by the master device independently for each data path of the plurality of bidirectional data paths dependent upon the data eye information.

12. The method as recited in claim 7 , further comprising the master device transmitting a predetermined pattern to the slave device and adaptively modifying data path equalization coefficients within the master device for the grouping of data paths of the plurality of bidirectional data paths based upon the corresponding data eye information.

13. A memory subsystem comprising:

a memory device; and

a memory controller coupled to the memory device via a plurality of bidirectional data paths;

wherein the memory controller is configured to adaptively modify transmit characteristics based upon data eye information sent via one or more unidirectional data paths by the memory device, wherein the data eye information corresponds to an edge position of data signal transitions received by the memory device on each data path of the plurality of bidirectional data paths;

wherein the memory controller is further configured to modify data path equalization coefficients within the memory controller for a grouping of data paths of the bidirectional data paths dependent upon the data eye information; and

wherein the memory controller is further configured to adaptively modify transmit characteristics based upon cyclic redundancy code (CRC) information sent via the one or more unidirectional data paths, wherein the CRC information corresponds to data sent by the memory controller via a plurality of bidirectional data paths.

14. The memory subsystem as recited in claim 13 , wherein the memory controller is further configured to adaptively modify the data path equalization coefficients within the memory controller for the grouping of data paths of the bidirectional data paths dependent upon an average of the data eye information across the grouping.

15. The memory subsystem as recited in claim 13 , wherein the memory controller is further configured to adaptively modify a phase alignment of data transmitted by the memory controller via the grouping of data paths of the plurality of bidirectional data paths dependent upon the data eye information.

16. The memory subsystem as recited in claim 13 , wherein the memory controller is further configured to adaptively modify a phase alignment of data transmitted by the memory controller via the grouping of data paths of the plurality of bidirectional data paths dependent upon an average of the data eye information across the grouping.

17. The memory subsystem as recited in claim 13 , wherein the memory controller is further configured to adaptively modify a phase alignment of data transmitted by the memory controller independently for each data path of the plurality of bidirectional data paths dependent upon the data eye information.

18. The memory subsystem as recited in claim 13 , wherein the memory controller is further configured to transmit a predetermined pattern to the memory device and to adaptively modify data path equalization coefficients within the memory controller for the grouping of data paths of the plurality of bidirectional data paths based upon the corresponding data eye information.