64 Bit Snapshot¶
The snap block provides a packaged solution for capturing data from the FPGA fabric and making it accessible from the CPU. Snap64 captures to 2x32 bit wide shared BRAMs to effect a 64 bit capture.
|No. of Samples (2?)||nsamples||Specifies the depth of the Shared BRAM(s); i.e. the number of 64bit samples which are stored per capture.|
|din||IN||unsigned_64_0||The data to be captured. Regardless of type, the bit-level representation of these numbers are written as 64bit values to the Shared BRAMs.|
|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.|
Under TinySH/BORPH, this device will have 3 sub-devices:
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
bram_lsb are 32 bit wide Shared BRAMs of
the depth specified in
bram_msb holds the upper 32
bram_lsb holds the lower 32 bits of