MDC-Upgrade: MDC-Optical-Endpoint Hardware test

Here we collect the documents relative hardware measurement

Chip's temperatures

-- AttilioTarantola and Yanyu - 23 May 2008

In the attached document we record the temperature of the chips. The test's conditions are described in the document.

The Lattice-device utilization during the test is:

Ignore Preference Error(s):  True

Device utilization summary:

APIO               4/18           22% used

PIO               13/330           3% used

13/140           9% bonded

IOLOGIC            2/330          <1% used

SLICE            102/9612          1% used

EBR                2/66            3% used

PLL                2/2           100% used

PCS                1/1           100% used

Number of Signals: 403

Number of Connections: 891

Pin Constraint Summary:

13 out of 13 pins locked (100% locked).

Level adapters: U1, U2, U3

-- AttilioTarantola and Yanyu - 23 May 2008

Introduction: the voltage translators U1, U2, U3 translate 5V<->3.3V. The stay in between the Lattice and the CLPD on the MB.

In the picture:

- yellow signal: clk (50 MHz) produced in the lattice. Input for U2 (pin 1), 2.6V.

- green signal: output for U2(pin 20), 4.2V

The time difference between the two signals is 3.1 ns. Enlarging the picture one can see the ground line stays 1V below the signal's minima (1,2)

* U2 I/O print_000.jpg:

In the following pictures:

- yellow DRA: clk (50 MHz) produced in the lattice. Input for U3 (pin 9).

- green signal: output for U3 (pin 20).

* U3 I/O print_001.jpg:

The time difference between the two signals is 1.8 ns

* U3 I/O print_002.jpg:

We didn't observe strange behaviors of U1,U2,U3.

They are always pretty warm and the temperature changes as described in the previous document (it depends of the I/O in use). Even with fast signals (clk 50 MHz) the output is present and delayed by few ns.

In the real case the fastest signal which will pass through the level adapter will be DST (data strobe 1-10 MHz).

Jitter measurement

06 Jun 2008

Differential measurement of the 100 MHz CLK (Silicon Lab 531BA135M000BG) jitter. The probe was connected at R1.

-Number of acquisition:2000

-Statistical mean: 10 ns

-Std. deviation: 5.7 ps

In the following picture we probe the CLK signal at CS1: common stop pins. The CLK signal is generated by the CLK (Silicon Lab), it passes through the Lattice and then to CS1

-Number of acquisition:2000

-Statistical mean: 10 ns

-Std. deviation: 7 ps

-Pk-Pk:.50.87 ps

The CLK has been divided by 8 and multiplied by 8.

* MDC_100_MHz_PLL_1_to_1.jpg :

Following picture:The CLK has been divided by 5 and multiplied by 4.

-Number of acquisition:2000

-Statistical mean:(80 MHz)

-Std. deviation: 9.5 ps

-Pk-Pk: 80 ps

* MDC_100_MHz_times_4_div_5_hist.jpg :

Following picture:The CLK has been divided by 4 and multiplied by 5.

-Number of acquisition:2500

-Statistical mean: 8 ns (125 MHz)

-Std. deviation: 7 ps - 6 ps

-Pk-Pk: 53 ps

* MDC_100_MHz_times_5_div_4_fft.jpg:

* MDC_100_MHz_times_5_div_4_hist.jpg:

Topic attachments
I Attachment Action Size Date Who Comment
MDC_100_MHz_PLL_1_to_1.jpgjpg MDC_100_MHz_PLL_1_to_1.jpg manage 103 K 2008-06-06 - 21:59 AttilioTarantola jitter 1 to 1
MDC_100_MHz_PLL_1_to_1.pngpng MDC_100_MHz_PLL_1_to_1.png manage 9 K 2008-06-06 - 21:57 AttilioTarantola jitter 1 to 1
MDC_100_MHz_times_4_div_5_hist.jpgjpg MDC_100_MHz_times_4_div_5_hist.jpg manage 92 K 2008-06-06 - 22:08 AttilioTarantola CLK times 4 divided by 5
MDC_100_MHz_times_5_div_4_fft.jpgjpg MDC_100_MHz_times_5_div_4_fft.jpg manage 160 K 2008-06-06 - 22:09 AttilioTarantola CLK times 5 divided by 4
MDC_100_MHz_times_5_div_4_hist.jpgjpg MDC_100_MHz_times_5_div_4_hist.jpg manage 97 K 2008-06-06 - 22:11 AttilioTarantola histo:. CLK times 5 divided by 4
chip_temperature.pdfpdf chip_temperature.pdf manage 35 K 2008-06-06 - 21:06 AttilioTarantola chip temperature map
print_000.bmpbmp print_000.bmp manage 2 MB 2008-06-06 - 21:09 AttilioTarantola level adapter
print_000.jpgjpg print_000.jpg manage 98 K 2008-06-06 - 21:29 AttilioTarantola level adapter
print_001.jpgjpg print_001.jpg manage 96 K 2008-06-06 - 21:19 AttilioTarantola u3 I/O
print_002.jpgjpg print_002.jpg manage 96 K 2008-06-06 - 21:21 AttilioTarantola U3 I/O
Topic revision: r2 - 2009-10-27, JanMichel
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