Enhanced digital diagnostics for optical PAM apparatus
A Pulse Amplitude Modulated (PAM) optical device utilizing multiple wavelengths, features a communications interface having enhanced diagnostics capability. New registers are created to house additional diagnostic information, such as error rates. The diagnostic information may be stored in raw form, or as processed on-chip utilizing local resources.
1. An apparatus comprising:
a receiver configured to handle communication of optical data received over a plurality of optical channels and a parameter of the optical data communicated over a plurality of electrical channels;
a debugging memory configured to collect and store the parameter from the receiver; and
a master logic control comprising a first register storing the parameter of the optical data captured by the debugging memory, the master logic control configured to,
receive from the receiver parametric information relating to the optical data,
store the parametric information;
process the parameter with the parametric information to create diagnostic information, and
store the diagnostic information in a second register.
2. The apparatus of claim 1 further comprising
a number of the plurality of optical channels that differs from a number of the plurality of electrical channels, the parametric information further specifying a channel mapping value.
3. The apparatus of claim 2 wherein the channel mapping value is actively configurable.
4. The apparatus of claim 2 wherein the optical data is encoded by PAM4.
5. The apparatus of claim 1 wherein the parameter specifies a PAM4 histogram parameter.
6. The apparatus of claim 1 wherein the parametric information further includes a value specifying parameter monitoring at a host side or at a line side.
7. The apparatus of claim 1 wherein the parametric information further includes a value specifying parameter monitoring at an ingress side or at an egress side.
8. The apparatus of claim 1 wherein the parametric information further includes a value specifying channel-specific parameter monitoring.
9. The apparatus of claim 1 wherein the parametric information specifies an optical source property comprising a frequency, a temperature, or a current.
10. The apparatus claim 1 wherein the parametric information indicates a bit error rate.
11. The apparatus of claim 1 wherein the parametric information indicates a signal-to-noise ratio.
12. A method comprising:
a debugging memory receiving from an optical receiver, parametric information relating to optical data incoming to the receiver;
streaming the parametric information from the debugging memory to a first register of a master logic system;
processing the optical data with the parametric information by the master logic system to create diagnostic information; and
storing the diagnostic information in a second register of the master logic system.
13. The method of claim 12 wherein the parametric information further includes a value specifying a threshold.
14. The method of claim 12 wherein the optical data is encoded by PAM4.
15. The method of claim 12 wherein the parametric information further includes a value specifying monitoring at a host side or at a line side.
16. The method of claim 12 wherein the parametric information further includes a value specifying monitoring at an ingress side or at an egress side.
17. The method of claim 12 wherein the parametric information further includes a value specifying channel-specific parameter monitoring.
18. The method of claim 12 wherein the parametric information specifies an optical source property comprising a frequency, a temperature, or a current.
19. The method of claim 12 wherein the parametric information indicates a bit error rate.
20. The method of claim 12 wherein the parametric information indicates an amount of correction to account for residual inter-symbol interference.