Hi Gene,

Below you will find the location of RP20. This is the 1kΩ resistor-pack that you are going to want to swap out for the 33Ω resistor-pack that we are shipping you.

For reference purposes, the signal-mapping for RP20 on the BitsyXb is as follows:

- RP20.A = SSP_SCLK

- RP20.B = SSP_STXD

- RP20.C = SSP_SFRM

- RP20.D = SSP_SRXD

I have placed a shipping request with our Shipping Department for the 33Ω resistor-pack and I am sending 3 of them just in case there is an issue during the rework. I will send you a tracking # when they have shipped.

Thank you for your patience with this issue, and please let us know how we can be of any further assistance.

Best Regards,

Matt Grenier | Support Engineer | Eurotech Inc | O:+1 301.490.4007 x185 | matt.grenier@eurotech.com

-----Original Message-----
From: Massion, Gene [mailto:magene@mbari.org]
Sent: Tuesday, June 24, 2008 6:21 PM
To: Grenier, Matt
Subject: RE: [MBARI] SSP series resistance - Options for replacing 1k? resistor pack

Thanks Matt. I do need to get this modification handled as soon as possible so I will greatly appreciate anything you can do.

Regards

Gene Massion

Monterey Bay Aquarium Research Institute

7700 Sandholdt Road

Moss Landing, California 95039

831 7751922 (tel)

831 7751646 (fax)

-----Original Message-----

From: Grenier, Matt [mailto:Matt.Grenier@eurotech.com]

Sent: Tuesday, June 24, 2008 4:16 PM

To: Massion, Gene

Cc: Eurotech US Support

Subject: RE: [MBARI] SSP series resistance - Options for replacing 1k? resistor pack

Hi Gene,

I am acquiring this information for you and hope to have a response soon.

Thank you for your patience with this issue.

Best Regards,

Matt Grenier | Support Engineer | Eurotech Inc | O:+1 301.490.4007 x185 | matt.grenier@eurotech.com

-----Original Message-----

From: Massion, Gene [mailto:magene@mbari.org]

Sent: Sunday, June 22, 2008 6:07 PM

To: Grenier, Matt

Cc: Eurotech US Support

Subject: RE: [MBARI] SSP series resistance - Options for replacing 1k? resistor pack

Matt

Depending on what type of part is involved in the replacement we probably have qualified technicians if we can get the appropriate documentation. Will you be able to send something identifying which part needs to be replaced on the Bitsy board? If so, please expedite the 33 ohm resistor packs as soon as possible.

Thanks

Gene

-----Original Message-----

From: Grenier, Matt [mailto:Matt.Grenier@eurotech.com]

Sent: Thursday, June 19, 2008 3:01 PM

To: Massion, Gene

Cc: Eurotech US Support

Subject: RE: [MBARI] SSP series resistance - Options for replacing 1k? resistor pack

Hi Gene,

After speaking with our Director of Technical Services, I have been informed that we are replacing the 1k? resistor pack with a 33? resistor pack across all BitsyXb's.

As a result, the following options are available to you to resolve this issue:

a. Send the board back to Eurotech and we can replace the part with the appropriate 33? resistor pack

b. Assuming you have certified technicians to perform the rework, we can send you the 33? resistor packs and you can rework them in-house

c. As we discussed on the phone, you can remove the 1k? resistor pack, and jumper a wire across the appropriate pins.

Please let us know how these options work for you and how we can be of any further assistance.

Best Regards,

Matt Grenier | Support Engineer | Eurotech Inc | O:+1 301.490.4007 x185 | matt.grenier@eurotech.com

From: Massion, Gene [mailto:magene@mbari.org]

Sent: Friday, June 13, 2008 5:40 PM

To: Eurotech US Support

Subject: [MBARI] SSP series resistance

Andrew

I'd love to get some help with this. I've been struggling to get the SSP working on my application with lots of little problems. Right now the ADC boards works fine when running off its internal SCLK. When I hook up the Xb's SCLK the data gets clocked out of the ADC incorrectly. The data is consistent but wrong. The only thing that changes between the two setups is a jumper on the ADC board that selects between internal and external SCLK and the Xb SCLK instead of the internal SCLK so we've been looking at this as the culprit.

I did a quick analysis of what happens to my SCLK with a RC filter. The input chip on the ADC board has a 4 pF input capacitance and if I add another 10 pF for stray capacitance and wiring and the 1K resistor, I calculate a clock signal that looks very much like what I'm seeing on my scope.

I was thinking about trying to use the ADC internal clock to drive the SSP port SCLK in clock slave mode but the resistor will still affect the signal just in the other direction. If you can provide some help in pulling or changing the resistor pack, that would be great.

Also, any experience or examples with high speed SSP transfers would be greatly appreciated

Thanks

Gene Massion

Monterey Bay Aquarium Research Institute

7700 Sandholdt Road

Moss Landing, California 95039

831 7751922 (tel)

831 7751646 (fax)

No virus found in this incoming message.

Checked by AVG.

Version: 8.0.100 / Virus Database: 270.4.1/1511 - Release Date: 6/20/2008 11:52 AM