T2080 GPCM Burst Mode

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T2080 GPCM Burst Mode

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scottgerhold
Contributor II

The 11/2016 T2080 Ref Manual shows Normal GPCM read operation for a burst in Figure 13-47. It appears to be incorrect however. The parameter in question is the TRAD delay shown from the falling edge of OE_SYNC to SAMP_PULSE. Is that really TRAD, or simply 2 clocks in length based on the discussion a couple of pages earlier. The delays between the SAMP_PULSE would then be TRAD based on the timing above it, but the first delay seems incorrect. I would assume that the T2080 is only going to cause 1 set of TRAD delays (could be 100 ns or longer) and not 2 sets as shown in the figure. It appears that OE_SYNC, DATA_SYNC and SAMP_PULSE signals are all internal to the T2080 and attempting to show the relationship between the external bus, the internal/external clocks and the data buses.

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Bulat
NXP TechSupport
NXP TechSupport

You are correct, OE_SYNC, DATA_SYNC and SAMP_PULSE signals at the three lower traces are internal to the T2080, are not intended for the users and should be ignored.

Upper traces show actual bus timing, TRAD is the time from OE low to address switching. The first data beat is sampled at the IFC_CLK rising edge right before address is changed.

Regards,

Bulat

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