Snap - david-macmahon/wiki_convert_test GitHub Wiki
Block: Snapshot Capture (snap)
Block Author: Aaron Parsons
Document Author: Aaron Parsons, Ben Blackman
Summary
The snap block provides a packaged solution for capturing data from the FPGA fabric and making it accessible from the CPU. Snap captures to a 32 bit wide shared BRAM.
Mask Parameters
| Parameter | Variable | Description |
|---|---|---|
| No. of Samples ((2^?)) | nsamples | Specifies the depth of the Shared BRAM(s); i.e. the number of 32bit samples which are stored per capture. |
Ports
| Port | Dir | Data Type | Description |
|---|---|---|---|
| din | IN | unsigned_32_0 | The data to be captured. Regardless of type, the bit-level representation of these numbers are written as 32bit values to the Shared BRAM. |
| trig | IN | boolean | When high, triggers the beginning of a data capture. Thereafter, every enabled data is written to the shared BRAM until it is full. |
| we | IN | boolean | After a trigger is begun, enables a write to Shared BRAM. |
Description
Usage
Under TinySH/BORPH, this device will have 3 sub-devices: ctrl, bram,
and addr. ctrl is an input register. Bit 0, when driven from low to
high, enables a trigger/data capture to occur. Bit 1, when high,
overrides trig to trigger instantly. Bit 2, when high, overrides we
to always write data to bram. addr is an output register and records
the last address of bram to which data was written. bram is a 32 bit
wide Shared BRAM of the depth specified in Parameters.