ADE9000 datasheet(36/73 Pages) AD

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Data Sheet

ADE9000

Rev. A | Page 35 of 72

WAVEFORM BUFFER

The ADE9000 has a waveform buffer comprised of 2048, 32-bit

memory locations. To configure the data into the waveform

buffer, use the WF_SRC and WF_CAP_SEL bits in the

WFB_CFG register.

The data can come from the following four locations, as follows:

•

Sinc4 outputs at 32 kSPS. The waveform buffer holds 8 ms

of waveform data per channel.

•

Sinc4 + IIR LPF output at 8 kSPS. The waveform buffer

holds 32 ms of waveform data per channel.

•

Current and voltage channel waveforms processed by the

DSP at 8 kSPS. The waveform buffer holds 32 ms of

waveform data per channel.

•

Resampled waveforms with 128 points per line cycle

processed by the DSP. The data rate varies with the line

period. The waveform buffer holds 80 ms of waveform data

per channel.

The waveform buffer offers the following different filling modes

for use with fixed data rate samples:

•

Stop when buffer is full

•

Continuous filling

The ADE9000 allows a selection of events to trigger waveform

buffer captures, and there is an option to store the current

waveform buffer address during an event to allow the user

to synchronize the event with the waveform samples. The

following waveform buffer actions are associated with an event

when the buffer is filling continuously:

•

Stops filling on trigger

•

Centers capture around trigger

•

Saves the event address and keeps filling

Use the SPI burst read mode to read the waveform buffer

contents. The default value bursts out all the channels in the

waveform buffer.

The waveform buffer generates an interrupt on IRQ0 after the

last address is filled. The DSP must be on to use the waveform

buffer.

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