Digilent Atlys Reference Manual - Page 5

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Atlys Reference Manual

Power

The power application provides highly accurate

(better than 1%) real-time current and power

readings from four on-board power-supply

monitors. The monitors are based on Linear

Technology's LTC2481C sigma-delta analog to

digital converters that return 16-bit samples for

each channel.

Real-time current and power data is displayed

in tabular form and updated continuously when

the power meter is active (or started).

Historical data is available using the Show

Graph feature – up to 10 minutes of measured

current data can be displayed for all four power

supplies. Recorded values are also stored in a

buffer that can be saved to a file for later

analysis. The Save Buffer and Clear Buffer are

used to save and clear the historical data in the

buffer.

The register I/O tab requires that a

corresponding IP block, available in a

reference design on the Digilent website, is

included and active in the FPGA. This IP block

provides an EPP-style interface, where an 8-bit

address selects a register, and data read and

write buttons transfer data to and from the

selected address. Addresses entered into the

address field must match the physical address

included in the FPGA IP block.

small amounts of data into and out of specific

registers in a given design. This feature greatly

simplifies passing control parameters into a

design, or reading low-frequency status

information out of a design.

Doc: 502-178

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