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Re: [Discuss-gnuradio] flowstates - FX2

From: Dominik Auras
Subject: Re: [Discuss-gnuradio] flowstates - FX2
Date: Thu, 30 Apr 2009 18:27:42 +0200
User-agent: Thunderbird (X11/20090320)

If I have reengineered this correctly (gpif.gpf crashes the current GPIF Designer, importing gpif.c skips the flow states), you set to transfer data at rising AND falling edge while in flow state. Is this correct?

I can give the answer to myself ;-) Took a while ...

So, data is transferred on the falling and rising edge of master strobe (which is not connected to the FPGA). The half period of MSTB is 1 IFCLK cycle (which is the minimum). Hence, data is actually transferred once per IFCLK cycle (twice per MSTB cycle). MSTB is toggling at 24 Mhz. This gives a data rate of 96 Mb/s (16 bit per IFCLK cycle, which runs at 48 Mhz).

IFCLK is generated internally, and output inverted to the FPGA.


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