64 Bit Snapshot¶
snap64
)Contents |
Summary¶
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.
Mask Parameters¶
Parameter | Variable | Description |
---|---|---|
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. |
Ports¶
Port | Dir | Data Type | Description |
---|---|---|---|
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. |
Description¶
Usage¶
Under TinySH/BORPH, this device will have 3 sub-devices: ctrl
,
bram_msb
, bram_lsb
, 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_msb
and bram_lsb
are 32 bit wide Shared BRAMs of
the depth specified in Parameters
. bram_msb
holds the upper 32
bits of din
while bram_lsb
holds the lower 32 bits of din
.