Decimation Problem using two AD converters

[gmiller]

Test Unit:
DSP Card: Quixote I
Quixote_inf_C2_CX.exo
Windows XP INTEL DUAL 3.8 GHz.

Setup:
Using the ASNAP example from the PIZMO examples with 2 Analog sources on the AD converter (Channel 0 and 1)

TimeBase Parameters:
- Continuous
- Input Sample Rate for the Timebase at about 1 MHz. (doesn’t really matter could be from 0.1 to 10 MHz)

Question: When the Decimation factor is greater than zero (0) then data from channel one (1) becomes garbage. Why?

I’m reading data in channel 0 properly. Sometimes Channel 1 gives proper data for one buffer at the beginning of an acquisition and then stops putting out corret data.
The final solution should allow data acquisition from 2 analog channels with a decimation factor applied on the FIFO buffers
The decimation factor is same for both channels.
I’m using the ASNAP example in this question, but I have the same problem occurring in my own programs.
ASNAP example use AinStream class; I use ADCStream in my own programs, but with similar results
I have similar problem when using other types of timebase (other than basicTmb)
No problems with any other timebase parameters.

[gmiller]

A: We have updated the Logic for the Quixote to version Quixote_inf_C2_CY.exo or if you have a 6M Quixote_inf_C6_CY.exo. This cured several problems with timing and also cured the decimation problem. These files have the new version of Logic and is supported in version 7.1 SP2 of Xilinx.
6Meg Vertex
2Meg Vertex