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Nexxim Design Examples >
Nexxim SI Design Examples >
AMI Analysis Example >
Channel Example with AMI

Channel Example with AMI

The schematic for the circuit is available in the Examples directory.

Open the project from its file in the Examples directory.

1. On the File menu, select Open Examples. The File Open window appears.

2. Open SI_Circuit, then select the file AMI_Example.adsn. Click Open.

The channel schematic appears in the design window:

1. Double-click on the AMI Source to display its properties:

The library file contains the AMI code for both transmitter and receiver.

Note

Linux users must click on the Value button to open the Edit Filename dialog. Click Browse to open the my_dll directory. Select the library file ibis_ami_example_lnx.so. Click OK to close the Edit Filename dialog, and OK again to close the Properties dialog.

The parameters file contains FFE data for the transmitter:

| method = 1 applies the tap weights inside AMI_init to the channel impulse

| method = 2 applies the tap weights inside AMI_Getwave to the wave

| results of both methods should be nearly identical, but method 1 is faster.

(method 1) | 1 or 2

(ffe 1 -0.2 0.1 -0.05) | arbitrary number of tap weights

Note

Method 1 is required for VerifEye analysis to produce the same result as AMI. VE uses just the impulse data from AMI_Init, and does not use the AMI_Getwave data.

2. Double-click on the AMI Probe to display its properties:

The library file contains the AMI code for both transmitter and receiver.

Note

The parameters file contains FFE and clock data for the receiver:

| method = 1 applies the tap weights inside AMI_init to the channel impulse

| method = 2 applies the tap weights inside AMI_Getwave to the wave

| results of both methods should be nearly identical, but method 1 is faster

(method 1) | 1 or 2

(ffe 1 -0.1 -0.05) | arbitrary number of tap weights

(clock_threshold 0.4) | threshold for clock tics

Note

Method 1 is required for VerifEye analysis to produce the same result as AMI. VE uses just the impulse data from AMI_Init, and does not use the AMI_Getwave data.

3. Expand the Project tree to show the Analysis setups, and double-click on the AMI Analysis setup. The setup simply specifies the input time step:

4. Right-click on the AMI Analysis setup and select Analyze. The AMI analysis runs to completion.

5. Expand the project tree to show the Reports:

6. Double click on AMI analysis impulse responses to open the report showing the impulse responses as initially calculated and as modified by the FFE tap weights in the Source or Probe by FFE method 1 or 2. With method 1 (shown), the FFE taps are applied to the impulse response and are reflected on this graph. With method 2, the equalization is applied internally to the model and would not affect the impulse response.

Edit the parameters files to select the method and change the FFE tap numbers and weights.

7. Double click on AMI; driving PWL signal with jitter to open the report showing the eye diagram of the input signal.

8. Double click on AMI; signal after AMI source to open the report showing the eye diagram of the output signal from the AMI Source.

9. Double click on AMI; signal after channel to open the report showing the eye diagram of the output signal from the channel.

10. Double click on AMI; signal after probe to open the report showing the eye diagram of the output signal from the AMI Probe.

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